Статті в журналах з теми "Piston coating"
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1
Mar'in, Dmitriy, Il'mas Salahutdinov, Denis Molochnikov, Rail' Mustyakimov, and Ilnar Gayaziev. "RESULTS OF MOTOR TESTS OF EXPERIMENTAL GASOLINE INTERNAL COMBUSTION ENGINE." Vestnik of Kazan State Agrarian University 14, no. 4 (April 12, 2020): 64–68. http://dx.doi.org/10.12737/2073-0462-2020-64-68.
Повний текст джерелаАнотація:
Current trends in the engine industry are aimed at improving the power and fuel-economic indicators of an internal combustion engine (ICE). This, in turn, is accompanied by an increase in the mechanical and thermal load on the details of the cylinder-piston group (CPG). One of the most loaded parts of the CPG is the piston. Overheating of the piston leads to premature wear of rubbing surfaces, occurrence of piston rings and their breakdowns, jamming of pistons, burnouts of the piston bottom, etc. Modern technology can protect engine parts subject to thermal stresses, especially pistons, by using structural coatings or special insulating materials. The main idea of such a coating is to reflect thermal energy back into the combustion chamber, which should prevent the piston from overheating. Thermal protective coatings are applied by plasma and detonation methods, however, such coatings are destroyed during operation and therefore they are not widely used to reduce the temperature level of the piston. To improve the thermal insulation properties of the piston, it is proposed to form a heat-insulating coating on the working surfaces of the piston head by microarc oxidation (MAO). A distinctive feature of MAO is the participation in the process of covering formation of surface microdischarges that have a very significant and specific effect on the forming covering, as a result of which the composition and structure of the resulting oxidized layers are significantly different, and the properties are significantly increased compared to conventional anode films. Comparative motor tests, the results of which showed that an engine equipped with pistons with a heat-insulating coating on the working surfaces of the head, increase power by 5.3% and reduce fuel consumption by 5.7%, compared with an engine equipped with standard pistons.
2
Thibblin, Anders, and Ulf Olofsson. "A study of suspension plasma-sprayed insulated pistons evaluated in a heavy-duty diesel engine." International Journal of Engine Research 21, no. 6 (October 3, 2019): 987–97. http://dx.doi.org/10.1177/1468087419879530.
Повний текст джерелаАнотація:
Thermal barrier coatings can be used to reduce the heat losses in heavy-duty diesel engines. A relatively new coating method for thermal barrier coatings is suspension plasma-spraying. Single-cylinder engine tests have been run to evaluate how heat losses to piston, cylinder head and exhausts as well as the specific fuel consumption are influenced by coating pistons with two different suspension plasma-sprayed thermal barrier coatings and one atmospheric plasma-sprayed thermal barrier coating, and comparing the results to those from an uncoated steel piston. The two suspension plasma-sprayed thermal barrier coatings showed reduced heat losses through the piston and less heat redirected to the cylinder head compared to conventional atmospheric plasma-sprayed thermal barrier coating, while one suspension plasma-sprayed coating with yttria-stabilized zirconia as top coat material showed increased exhaust temperature. However, the indicated specific fuel consumption was higher for all tested thermal barrier coatings than for an uncoated engine. The best performing thermal barrier coating with respect to indicated specific fuel consumption was a suspension plasma-sprayed coating with gadolinium zirconate as top coat material.
3
Belov, Vyacheslav P., Dmitry V. Apelinsky, and Vadim N. Bezhenar. "Influence of heat-protective coatings on the temperature state of tractor diesel pistons." Izvestiya MGTU MAMI 16, no. 2 (January 18, 2023): 107–13. http://dx.doi.org/10.17816/2074-0530-106387.
Повний текст джерелаАнотація:
BACKGROUND: The paper presents the results of thermometry of pistons with the TsNIDI type combustion chamber (CC) of the D-240 and the D-245 tractor diesel engines. Various constructive and technological measures aimed at increasing the thermal resistance of pistons are considered.
AIMS: To evaluate the effect of heat-protective coatings on the temperature state of pistons with the TsNIDI type combustion chamber.
METHODS: Motor bench tests of the D-240 and the D-245 diesel engines, equipped with pistons with heat-protective coatings (HPC) on the bottom, were carried out. In the process of research, the influence of the HPC on the thermal state of the pistons as well as on the power and economic indicators of these diesel engines was studied.
RESULTS: It is established that hard anodizing leads to a slight decrease in temperatures and their differences at characteristic points of the piston in stationary and non-stationary diesel operation modes. It is noted that the slow rise in temperature at the bottom of the piston is caused by a decrease in the amount of heat supplied to it due to the low thermal conductivity of the oxide layer. It is shown that the PN85Yu15 gas-plasma coating leads to a significant decrease in temperatures and their differences along the piston bottom. It is determined that this coating helps to reduce the specific effective fuel consumption due to the reduction of the ignition delay period in the combustion process. It is noted that a slower growth rate of temperatures and their differences, especially in the zone of the edge of the CC, should reduce the magnitude of thermal stresses, and therefore increase the thermal resistance of the experimental pistons.
CONCLUSIONS: It is revealed that the most effective way to reduce the heat stress of the piston is the application of heat-protective coatings on its bottom. The influence of the abovementioned coatings on the nature of the temperature distribution and their differences in the piston head is investigated.
4
Chitthaarth, M. R., and K. Manivannan. "Thermal Analysis of Ceramic Coated Aluminium Piston with Slots." Applied Mechanics and Materials 592-594 (July 2014): 786–90. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.786.
Повний текст джерелаАнотація:
The main aim is to control thermal expansion in aluminium piston at high working condition. A plasma sprayed ceramic coating (TBC) is applied on the piston crown as a top coat and NiCrAl is applied as the middle layer as bond coat to improve the addition strength between the top coat and the metal subtract layer as AlSi alloy; we introduce a thermal slot on the piston shrink to regulate the heat flow in piston and make it cooler. We analyse the piston with these two implementations to determine the thermal analysis of the piston. The results can be shown in the various comparisons of coating thickness of top coat with thermal slots on the piston shrink. Increase in coating thickness reduces the stress in the coatings. It is observed that 85°C increase in 0.8mm coat than the ordinary piston.
5
Liu, Yu Wei, Wei Zheng Zhang, and Yuan Fu Cao. "Thermal Analysis of an Anodic Oxide Coating Diesel Engine Piston Using 3-D Finite Element Method." Advanced Materials Research 548 (July 2012): 450–55. http://dx.doi.org/10.4028/www.scientific.net/amr.548.450.
Повний текст джерелаАнотація:
According to the phenomenon that the piston’s reliability and durability have been significantly weakened due to its high temperature, hard anodizing is used to hinder the heat transfer from the combustion gas to the metal base of the piston. Thermal analyses are performed on pistons with different thicknesses of anodic oxide coatings. The effects of coatings on the thermal behaviors of the pistons are investigated. The numerical results are compared with each other. It has been shown that the maximum surface temperature of the coated pistons with anodic oxide coating which has low thermal conductivity are significantly improved. Also, considering the hard anodizing process, the 100 ~ 150μm thickness of the anodic oxide coating would meet the requirements of the piston’s reliability.
6
Al-Bdeiri, Mahmood, Vladimir Krasilnikov, and Sergey Sergeev. "Modified quasi-stationary method for studying changes in transition temperatures of diesel engine pistons coated with heat-shielding materials." Proceedings of Irkutsk State Technical University 24, no. 5 (October 2020): 954–65. http://dx.doi.org/10.21285/1814-3520-2020-5-954-965.
Повний текст джерелаАнотація:
The purpose of the work is to identify complex transient heat flow paths in the combustion chamber of engine, significantly improve the models of diesel engine heat flow, and study the effect of aluminum oxide coating by the galvanic plasma method on short-term and long-term reactions of the piston head. The analysis of operation of aluminum alloy coated diesel engine piston is carried out using a modified quasi -steady method and a finite element method. A thermodynamic analysis is presented using energy and state equations with corresponding gas heat transfer. Time-dependent boundary conditions are set on the gas-blown surfaces of 2D finite element transition models of combustion chamber components. It is shown that this methodology can reveal complex transient paths of the heat flow in engine combustion chambers and distribution details of heat losses in various cooling media. Numerical simulation has shown that the maximum temperature increase relative to the uncoated piston is 64.3% for the coating thickness of 0.13 mm. Tests have shown that the coatings can endure up to 280 thermal cycles. It is found out that predictions of numerical simulation are in good agreement with the results of experiments conducted with repaired pistons. The experimental operation of Cummins КТА 38 engines at Chernogorsk and Vostochno-Beysk coal mines has shown that the engine equipped after repair with the piston coated with aluminum applied by the galvanic plasma method has been in operation for 2 years and 3 months, whereas its set overhaul period is 18,000 hours. Therefore, the proposed methodology allows to reduce temperature variations in the piston and, thereby increase the service life of engine pistons coated with the use of the thermal barrier coating technology.
7
Sitdikov, V. M., N. Yu Dudareva, A. A. Ishemguzhin, and I. A. Dautov. "Emission control and reduction in the combustion chamber of an internal combustion engine." Trudy NAMI, no. 4 (January 3, 2023): 83–95. http://dx.doi.org/10.51187/0135-3152-2022-4-83-95.
Повний текст джерелаАнотація:
Introduction (problem statement and relevance). The task of emission control and reduction for internal combustion engines (ICE) is a relevant issue of the modern engine building. However, the catalytic converters potential is limited and almost exhausted. The paper authors study the possibility to partially reduce toxic emissions directly in the engine combustion chamber by means of the ceramic coating formed on the piston crown.The purpose of the paper is to study the influence of the coating formed by the method of microarc oxidation on the combustion chamber parts on the ICE exhaust toxicity.Methodology and research methods. The experimental method of research was applied. The research was carried out on the RMZ-551i engine. Engine tests were performed in various load modes: the rotation rate changed from 2000 to 6000 rpm, and the throttle opening amounted to 25, 50, 75 and 100% in each speed mode.Results. The paper presents experimental data proving the real possibility to decrease the ICE exhaust gas toxicity through formation of a ceramic coating on the piston crown. A relative decrease of carbon monoxide concentration in exhaust gases by 3.1% was noticed when using coatings on pistons compared to using standard pistons. Along with the decrease of CO amount, a relative increase of carbon dioxide (СО2) concentration by 2.1% is noticed.Practical significance. The provided experimental data obtained in the engine tests showed the possibility to partially reduce the amount of toxic components in exhaust gases directly in the combustion chamber by means of the coating on the piston crown formed by microarc oxidation method.
8
Mahalingam, S., S. Ganesan, H. Yashik Ahammed, and V. Venkatesh. "Effect on Performance and Emission Analysis of Advanced Ceramic Material Coated Piston Crown Using Plasma Spray Coating Techniques." Applied Mechanics and Materials 766-767 (June 2015): 612–17. http://dx.doi.org/10.4028/www.scientific.net/amm.766-767.612.
Повний текст джерелаАнотація:
Advanced ceramic coating technologies are commonly used as metal coatings for internal combustion engine components and aerospace application. The thermal barrier coatings are being applied to the engine components to increasing life and improve the performance of the engine. This experimental study is focused on advanced ceramic material of Zirconia stabilized with the yttrium oxide (Zirconia 80% wt and Yttia 20 % by weight) applied on the piston crown for analyzing the performance and emission characteristics of the diesel engine. By using ceramics coated piston crown, the brake thermal efficiency and specific fuel consumption were improved as compared to that of the piston without coating. Exhaust emission level of CO, UHC and NOx are also considerably reduced using advanced ceramic metal coating techniques.
9
Maryin, Dmitry, Andrei Glushchenko, Anton Khokhlov, Evgeny Proshkin, and Rail Mustyakimov. "Results of engine tests of an experimental gasoline internal combustion engine." BIO Web of Conferences 17 (2020): 00078. http://dx.doi.org/10.1051/bioconf/20201700078.
Повний текст джерелаАнотація:
To improve the power and fuel and economic performance of a gasoline internal combustion engine, it has been proposed to improve the insulating properties of the piston by forming a heat-insulating coating on the working surfaces of the piston head with a thickness of 25...30 μm using the microarc oxidation method. Comparative results of engine tests are carried out, which showed that an engine equipped with pistons with a heat-insulating coating on the working surfaces of the head increases power by 5.3 % and reduces hourly fuel consumption by 5.7 % compared to an engine equipped with standard pistons.
10
Jayanth, P., and E. Sangeeth Kumar. "Investigation and Analysis of Wear Reduction in Piston Rings through Coating." Applied Mechanics and Materials 813-814 (November 2015): 874–79. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.874.
Повний текст джерелаАнотація:
In this study, the surface of a Piston Ring in the engine is coated with multilayered coating powder using plasma-spray technique, and its surface behavior is subsequently analyzed. The purpose of this study is to analyze the mechanical and thermal effects of surface coating for a Piston Ring during friction. Here specimens with and without coatings were prepared and then microstructure, hardness and corrosion tests were carried out. From the experimental results and Ansys results, it has been found that the coated specimen has improved the properties in improving the diesel engine performance. The results show less deformation and fewer scratches due to wear on the multilayer coated Piston Ring as compared to the uncoated one. The surfaces topography and the structure of the plasma spray coatings is observed on the scanning Electron microscope. The evaluation of the adhesion of coatings is made using the hardness test and also compared using the thermal barrier properties. Taking into account the results of measurements, one can state that the lowest wear and thermal resistance on piston rings by plasma spray coating.
11
Fei, Chunguang, Tong Lei, Zuoqin Qian, and Zihao Shu. "Piston Thermal Analysis of Heavy Commercial Vehicle Diesel Engine Using Lanthanum Zirconate Thermal-Barrier Coating." Energies 15, no. 12 (June 8, 2022): 4225. http://dx.doi.org/10.3390/en15124225.
Повний текст джерелаАнотація:
When a commercial vehicle diesel engine works for an extended period of time at the torque spot, it can easily cause a mechanical failure due to the high temperature of the piston. In this paper, the temperature plug method was used to measure the temperature of the piston at the maximum torque spot. In order to reduce the failure caused by high temperature, the finite element analysis software Ansys was used in this paper to study the effects of different thicknesses of ceramic coatings on the piston surface of a diesel engine on the maximum temperature of the piston substrate. The bonding layer of the ceramic coating was NiCoCrAlY with a thickness of 0.1 mm, and the insulating layer was a La2Zr2O7 coating with respective thicknesses of 0.2 mm, 0.3 mm, 0.5 mm, 0.7 mm, and 0.9 mm. When the thickness of the ceramic coating was increased from 0.3 mm to 1.0 mm, the maximum temperature of the piston base decreased from 347.9 °C to 267.46 °C. This showed that the use of a thermal-barrier coating can effectively reduce the maximum temperature of the piston and greatly improve the safety of engine operation.
12
Nazim Ibrahimov, Nazim Ibrahimov, and Maleyka Mammadova Maleyka Mammadova. "INCREASING THE CURRENCY RESISTANCE OF CYLINDER-PLASTING OF PYSTON PUMPS BY PLASMA METHOD." ETM - Equipment, Technologies, Materials 08, no. 04 (September 26, 2021): 82–86. http://dx.doi.org/10.36962/etm0804202182.
Повний текст джерелаАнотація:
The article examines the study of increasing the wear resistance of the cylinder-sleeve of a piston pump using the developed technology of plasma spraying. Wear-resistant and durable coatings of nickel, chromium, molybdenum and tungsten were obtained on the surface of the piston pump cylinder-sleeve. A graph of the dependence of the coating thickness depending on the surface hardness of the cylinder-sleeve is presented. According to the graph, depending on the hardness, you can determine the wear resistance of the coating surface of the cylinder-sleeve. Keywords: piston pump, cylinder liners, plasma method, nickel, chromium, molybdenum, tungsten, wear resistance, coating thickness, hardness, graphical dependence
13
Baba, Nor Bahiyah, Megat Muhamad Amrun Omar, and Norul Azlin Mohd Zin. "Thermal Properties of NiCrSiB Coating on Piston Engine." Advanced Materials Research 974 (June 2014): 71–75. http://dx.doi.org/10.4028/www.scientific.net/amr.974.71.
Повний текст джерелаАнотація:
This paper discussed on the application of NiCrSiB coating on 3-straight cylinder piston of Perodua Kancil 660cc using a high velocity oxygen fuel (HVOF) spraying technique. NiCrSiB coating was known as protective coating that was investigated for its thermal properties. The coating showed a good surface finish as well as the bonding interface. The applied NiCrSiB coating on the piston was tested up to the engine temperature during the operation compared to the uncoated piston. It was found that the uncoated piston had a higher heat transfer than the coated piston. Another test was conducted at several temperatures along the radial of the piston to its centre. The results indicated that the uncoated piston had a higher temperature compared to the coated piston.
14
Krasnyy, V. A., Vyacheslav V. Maksarov, and D. D. Maksimov. "Improving the Wear Resistance of Piston Rings of Internal Combustion Engines when Using Ion-Plasma Coatings." Key Engineering Materials 854 (July 2020): 133–39. http://dx.doi.org/10.4028/www.scientific.net/kem.854.133.
Повний текст джерелаАнотація:
Modern designs of piston rings of internal combustion engines and wear-resistant coatings used for them are considered. It is noted that the upper (compression) ring undergoes the most intense wear. Among the traditionally used wear-resistant coatings of compression rings, galvanic chrome plating and thermal spraying with molybdenum are most often used. The paper proposes the use of the ion-plasma spraying method for applying hard wear-resistant coatings to the working surface of piston rings based on titanium and molybdenum nitrides. The specified method relates to vacuum coating technologies (PVD methods), in which layers of high-strength materials are sprayed directly onto the surface of the product. The present work aimed to carry out comparative tribotechnical tests of piston ring samples having hard coatings obtained by ion-plasma spraying and to compare them with traditional galvanic chromium plating. A technique has been developed for a comprehensive assessment of comparative tribological characteristics, including the critical load during testing, the specific load of seizing, the coefficients of friction, scoring resistance, and wear resistance. The test results of samples with the galvanic coating with chromium, ion-plasma spraying with titanium nitride, and molybdenum nitride are shown. In contrast, it is shown that samples with an applied ion-plasma coating surpass samples that are electrolytically chrome plated by all tribological parameters. The results obtained allow concluding that the ion-plasma coating of molybdenum nitride is promising for piston rings, as well as other critical parts of internal combustion engines.
15
Musin, Niyaz, and Natalia Dudareva. "Investigation of the effect of the coating formed by microarc oxidation on the piston top on the thermal state of the internal combustion engine parts." MATEC Web of Conferences 224 (2018): 03008. http://dx.doi.org/10.1051/matecconf/201822403008.
Повний текст джерелаАнотація:
The aim of this work is to study the influence of MAO-coatings on the thermal state of the engine piston. The results of numerical modeling of the temperature distribution in the piston are presented for different values of thickness and conductivity of the coating. Regression equations are obtained. For thermal protection of the piston it is recommended to apply MAO-coatings with thermal conductivity of 0.3...0.7 W/m.K and thickness 150…300 µm.
16
N, Venkat Karthik, Suresh Kumar V, Yuvaraj K, Balaji ., and Palani . "FEA Analysis and Experimental Investigation of the Ceramic Coating on Aluminum Piston Material By Plasma Spray Coating Technique." International Journal for Research in Applied Science and Engineering Technology 10, no. 3 (March 31, 2022): 990–1001. http://dx.doi.org/10.22214/ijraset.2022.40765.
Повний текст джерелаАнотація:
Abstract: Functionally graded materials are of widespread interest because of their superior properties such as corrosion, erosion and oxidation resistance, high hardness, chemical and thermal stability at cryogenic and high temperatures. These properties make them useful for many applications, including Thermal Barrier Coating (TBC) on metallic substrates used at high temperatures in the fields of aircraft and aerospace, especially for thermal protection of components in gas turbines and diesel engines. The application of TBC reduces the heat loss to the engine cooling-jacket through the surface exposed to the heat transfer such as the cylinder head, liner, piston crown and piston rings. The insulation of the combustion chamber with ceramic coating affects the combustion process and, hence, the performance and exhaust emissions characteristics of the engines improve. In this project, the main emphasis is placed on the study of thermal behavior of functionally graded coatings obtained by means of using a commercial code, ANSYS on aluminum and steel piston surfaces and the results are verified with numerical and experimental works. Keywords: Thermal Barrier Coating, Piston, Insulation, Corrosion, ANSYS, engine cooling-jacket.
17
BORKOWSKA, Joanna, and Andrzej KAŹMIERCZAK. "Research and analysis of the results from the tribotester test for piston." Combustion Engines 169, no. 2 (May 1, 2017): 14–17. http://dx.doi.org/10.19206/ce-2017-203.
Повний текст джерелаАнотація:
Piston – ring – cylinder assembly of combustion engine has a lot of friction pairs examples, also one of them which decide about fastness to wear, it means first sealing ring – cylinder, called further very simply ring – cylinder unit. During work of this unit we can observe wear of piston, precisely – of coating which is deposited on ring to prolong service life. Objective of this work was to realize a test of roll-block type on tribotester to set durability of piston sample. Within the framework of this test were investigated a prototyped piston’s rings with diamond embankment. Piston rings are made of diamond coating technology with a porous chromium coating, where in pores is deposited on said diamond powder with a grain size about 1 micron. The work will be carried out of an analysis of collaboration piston – rings – cylinder unit in internal combustion engine and an analysis of the use of hard materials in friction pairs, including powders. The work aims to show the possibilities and benefits of the application of new protective coatings to reduce their wearing, which is consistent with the observed trend of technology development.
18
Rozario, Arthur, Christoph Baumann, and Raj Shah. "The Influence of a Piston Ring Coating on the Wear and Friction Generated during Linear Oscillation." Lubricants 7, no. 1 (January 14, 2019): 8. http://dx.doi.org/10.3390/lubricants7010008.
Повний текст джерелаАнотація:
The piston group is responsible for contributing to ~50% of the frictional losses of an engine, which ultimately leads to the waste of fuel. This coupled with the fact that gasoline is a finite resource linked to CO2-emissions, there is an increased demand of higher performance vehicles, which coincidently further loads the piston ring. As of yet, there are plenty of studies that already study the piston ring’s contact with the cylinder liner. However, this study focuses on a cost-effective Schwing, Reib, Verschleiss (SRV) instrumentation that allows to pre-screen lubricants, additives, materials and coatings for their friction, wear and load carrying capacity including scuffing resistance. As a result of the pre-screening conducted outside of engine by using the SRV instrument, it brings us to the following conclusion: the PVD CrN-TiN 1º Group coating on the piston ring produces the least wear, as well as the lowest coefficient of friction. Moreover, it is concluded that a coating that is based from CrN and TiN allows the piston ring to perform better in engine settings. A continued understanding of the piston-cylinder-contact assembly only helps engineers, scientists and any other stakeholder to improve on the piston ring and cylinder liner interaction.
19
Ye, Zi Bo, Sheng Guan Qu, Yong Hu, and Guang Hong Wang. "Study on Wear Mechanism of Chromium Carbide Coating Reinforced Cast Iron Cylinder Sleeve." Applied Mechanics and Materials 273 (January 2013): 124–28. http://dx.doi.org/10.4028/www.scientific.net/amm.273.124.
Повний текст джерелаАнотація:
In tribological system of internal combustion engine, cylinders and pistons were in high temperature, pressure and load working status. An SRV IV wear tester was used to measure dynamic coefficient of friction by simulating working condition of cylinder liner and piston ring. The worn surface topography was observed through scanning electron microscope and metallography. The results show that loads had little effect on the friction coefficient under oil lubrication. Cylinder with the high-chromium carburizing ring in pairs displayed wear in the form of plastic deformation, while cylinder with the phosphide cast iron ring in pairs displayed adhesive wear. The piston ring was subjected to shear stress and tensile force under dry friction condition and deformed into tapering burr. Lubricants played a bearer role under lubrication condition; therefore, surface borderline of piston ring was relatively flat.
20
Chou, Chih-Cheng, Pao-Chang Huang, and Huang-Bin Dai. "An Analysis of the Performance Characteristics of Different Cylinder Temperatures for Ni-W and Ni-W-BN(h) Plated Piston Rings in an Air-Cooled Engine." Energies 15, no. 3 (January 29, 2022): 1026. http://dx.doi.org/10.3390/en15031026.
Повний текст джерелаАнотація:
An engine must operate at an appropriate working temperature, the wear resistance of the engine parts must be increased, and frictional loss of energy must be reduced to increase performance and reduce exhaust pollution. This study determines the effect of cylinder temperature and different coatings for piston rings on engine characteristics. Ni-W alloy and Ni-W-BN(h) composite coatings are applied to the compression ring, and the dynamometer test is performed over 50 h using different operating parameters. The experimental data are analyzed by curve fitting for engine performance with cylinder temperature (Tsc) and the concentration of exhaust pollution particles. The experimental results show that a Ni-W alloy plating increases the wear resistance of piston rings. A Ni-W-BN(h) composite coating contains self-lubricating particles, which increases the wear resistance and lubricating properties. In terms of engine performance, Ni-W-BN(h) coated piston rings give the best brake mean effective pressure (BMEP) and fuel conversion efficiency (ηf), and low fuel consumption reduces HC and CO emissions. Therefore, Ni-W-BN(h) is the best coating material for a piston ring.
21
Ramasamy, Navin, Mohammad Abul Kalam, Mahendra Varman, and Yew Heng Teoh. "Comparative Studies of Piston Crown Coating with YSZ and Al2O3·SiO2 on Engine out Responses Using Conventional Diesel and Palm Oil Biodiesel." Coatings 11, no. 8 (July 23, 2021): 885. http://dx.doi.org/10.3390/coatings11080885.
Повний текст джерелаАнотація:
In this study, the effect of a thermal barrier coating with yttria-stabilized zirconia (YSZ) and aluminum silicate (Al2O3·SiO2) alongside an NiCrAl bond coat on the engine performance and emission analysis was evaluated by using conventional diesel and pure palm oil biodiesel. These materials were coated on the piston alloy via plasma spray coating. The findings demonstrated that YSZ coating presented better engine performances, in terms of brake thermal efficiency (BTE) and brake-specific fuel consumption (BSFC) for both fuels. The piston with YSZ coating materials achieved the highest BTE (15.94% for diesel, 14.55% for biodiesel) and lowest BSFC (498.96 g/kWh for diesel, 619.81 g/kWh for biodiesel). However, Al2O3·SiO2 coatings indicated better emission with lowest emissions of NO, CO, and CO2 for both diesel and biodiesel. For the uncoated piston, the results indicated that the engine clocked the highest torque and power, especially on diesel fuel due to the high viscosity and low caloric value, and it recorded the lowest hydrocarbon emission due to the complete combustion of fuel in the engine. Hence, it was concluded that the YSZ coating could lead to better engine performance, while Al2O3·SiO2 showed promising results in terms of greenhouse gas emission.
22
Khokhlov, A., D. Maryin, D. Molochnikov, A. Khokhlov, I. Gayaziev, and O. Smirnova. "Influence of the thickness and porosity of the oxide coating on the piston heads depending on the parameters of the microarc oxidation mode." Journal of Physics: Conference Series 2131, no. 4 (December 1, 2021): 042046. http://dx.doi.org/10.1088/1742-6596/2131/4/042046.
Повний текст джерелаАнотація:
Abstract This paper discusses the process of formation of an oxide coating (hardening and heat-insulating coating) on the working surfaces of the head (top and piston grooves) of the piston by the method of microarc oxidation (MAO). In the process of oxidation of the piston head, the operating parameters of MAO will have a significant effect on the thickness and porosity of a formed oxide coating. The paper presents the theoretical relationships between the electrical parameters of the microarc oxidation mode and the thickness and porosity of the oxide coating. The thickness of the formed oxide coating on the piston heads will depend on the applied voltage and the composition of the electrolyte used. The porosity of the formed oxide coating will depend on the parameters of the current strength and the applied voltage. It is theoretically established that the formation of an oxide coating of a certain thickness and porosity occurs due to changes in the current strength, voltage and time of microarc oxidation.
23
Mishra, Prakash Chandra, Anand Gupta, Saikat Samanta, Rihana B. Ishaq, and Fuad Khoshnaw. "Framework for Energy-Averaged Emission Mitigation Technique Adopting Gasoline-Methanol Blend Replacement and Piston Design Exchange." Energies 15, no. 19 (September 29, 2022): 7188. http://dx.doi.org/10.3390/en15197188.
Повний текст джерелаАнотація:
Measurement to mitigate automotive emission varies from energy content modification of fuel to waste energy recovery through energy system upgradation. The proposed energy-averaged emission mitigation technique involves interfacing piston design exchange and gasoline–methanol blend replacement with traditional gasoline for low carbon high energy content creation. Here, we interlinked the CO, CO2, NOx, O2, and HC to different design exchanges of coated pistons through the available brake power and speed of the engine. We assessed the relative effectiveness of various designs and coating thicknesses for different gasoline–methanol blends (0%,5%,10%, and 15%). The analysis shows the replacement of 5%, 10%, and 15% by volume of gasoline with methanol reduces the fuel carbon by 4.167%, 8.34%, and 12.5%, respectively. The fuel characteristics of blends are comparable to gasoline, hence there is no energy infrastructure modification required to develop the same amount of power. The CO and HC reduced significantly, while CO2 and NOx emissions are comparable. Increasing the coating thickness enhances the surface temperature retention and reduces heat transfer. The Type_C design of the steel piston and type_A design of the AlSi piston show temperature retention values of 582 °C and 598 °C, respectively. Type_A and type_B pistons are better compared to type_C and the type_D piston design for emission mitigation due to decarbonization of fuel through gasoline-methanol blend replacement. Surface response methodology predicts Delastic, σvon Mises, and Tsurface with percentage errors of 0.0042,0.35, and 0.9, respectively.
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Fei, Chun-Guang, Zuo-Qin Qian, Jie Ren, Xiang-Jun Zhou, and Si-Wei Zhu. "Numerical and Experimental Research on Thermal Insulation Performance of Marine Diesel Engine Piston Based on YSZ Thermal Barrier Coating." Coatings 11, no. 7 (June 25, 2021): 765. http://dx.doi.org/10.3390/coatings11070765.
Повний текст джерелаАнотація:
Although YSZ ceramic coating has been used in the field of aeroengines for a long time to protect blades from high temperature erosion, its application on marine engines is still very rare. In this study, YSZ powder was sprayed onto the upper surface of the Al-Si alloy piston by atmospheric plasma spraying. The piston with or without ceramic coatings was applied to the diesel engine bench, and the ship propulsion characteristics test was carried out to study the effect of the coating on the performance of the diesel engine when the ship was sailing. The temperature field results show that under 25% load, the temperature of the top surface of the coated piston is about 30.91 °C higher than that of the conventional piston. The increase in the temperature of the combustion chamber is conducive to better combustion of the fuel in the cylinder of the diesel engine. Therefore, when the marine diesel engine is tested for propulsion characteristics, the thermal efficiency is increased by 5% under the condition of 25% load.
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Kamanna, Balbheem, Bibin Jose, Ajay Shamrao Shedage, Sagar Ganpat Ambekar, Rajesh Somnath Shinde, and Sagar Landge. "Thermal Barrier Coating on IC Engine Piston to Improve Engine Efficiency." Global Journal of Enterprise Information System 9, no. 1 (May 5, 2017): 47. http://dx.doi.org/10.18311/gjeis/2017/15864.
Повний текст джерелаАнотація:
The piston is considered as most important part of I.C engine. High temperature produced in an I.C engine may contribute to high thermal stresses. Without appropriate heat transfer mechanism, the piston crown would operate ineffectively which reduce life cycle of piston and hence mechanical efficiency of engine. The literature survey shows that ideal piston consumes heat produced by burnt gases resulting in decrease of Engine overall Efficiency. In this project work an attempt is made to redesign piston crown using TBC on piston surface and to study its Performance. A 150 cc engine is considered and TBC material with different thickness is coated on the piston. 3D modeling of the piston geometry is done 3D designing software Solidworks2015. Finite Element analysis is used to calculate temperature and heat flux distribution on piston crown. The result shows TBC as a coating on piston crown surface reduces the heat transfer rate within the piston and that will results in increase of engine efficiency. Results also show that temperature and heat flux decreases with increase in coating thickness of YSZ.
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URTEKIN, LEVENT, and SERKAN BAYAŞOĞLU. "INVESTIGATION OF THE WEAR CHARACTERISTICS OF THERMAL BARRIER COATING IN A BIODIESEL ENGINE." Surface Review and Letters 27, no. 06 (August 28, 2019): 1950158. http://dx.doi.org/10.1142/s0218625x19501580.
Повний текст джерелаАнотація:
This study applied piston-valve coating for an engine that worked 100% on biodiesel fuel and investigated the wear characteristics after the experiment. The plasma spraying method was used as the coating method. Al2O3 and ZrO2 ceramics, which are the most frequently used ones in the literature, were selected as coating material. The deformations on the coated and uncoated surfaces were determined after running the engine at different time intervals. The deformations on the piston surfaces were interpreted by conducting SEM and EDX analyses. In particular, the deformation on the coating material, thermal fatigue cracks, abrasive wear and elements that clang to the piston surface after combustion were determined. Additionally, post-combustion engine oil analysis was carried out to determine the elements that were released as a result of the thermal wear in connection to combustion. The relationship of the coating with thermal efficiency was investigated for all types of coatings by determining temperatures from a certain point on the engine by using a thermal camera and a surface temperature measurement device. As a result of the SEM, EDX and engine oil (ICP) analyses, it was seen that the elements that are released as a result of wear such as Al, Fe and Cr had lower quantities with the aluminum oxide (Al2O3) coating with the Nickel–Chromium (Ni–Cr) bonding agent in comparison to the other coating materials. Additionally, as a result of oil analyses, the coated engine was observed to have more positive outcomes in comparison to the uncoated engine.
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Helmisyah, Ahmad Jalaludin, Shahrir Abdullah, and Mariyam Jameelah Ghazali. "Heat Transfer Characteristic of Thermal Barrier Coated Piston Crown for a Compressed Natural Gas Direct Injection Engine." Applied Mechanics and Materials 663 (October 2014): 304–10. http://dx.doi.org/10.4028/www.scientific.net/amm.663.304.
Повний текст джерелаАнотація:
Compressed natural gas with direct injection (CNGDI) engine produces high temperature and pressure ultimately leading to high thermal stress. The piston crown material fails to withstand high temperature and operate ineffectively due to improper heat transfer. By insulating the surface namely; thermal barrier coating (TBC) such as ceramic based yttria partially stabilised zirconia (YPSZ), heat transfer to the piston might be reduced and lead to improvement of piston durability. Hence, in this research, YPSZ/NiCrAl coating was utilised to differentiate with the uncoated piston crowns in terms of the ability to reduce thermal stresses to the piston using finite element method and burner rig test. Several samples of AC8A aluminium alloy piston crowns were coated with bonding element of NiCrAl and ZrO2-7.5Y2O3namely the YPSZ as the top coat by using air-plasma spraying technique and were assessed by burner rig test. The results exhibited the durability of the YPSZ/NiCrAl coating could withstand the test and the heat flux for the YPSZ/NiCrAl-coated piston crown was about 98% reduction compared to the uncoated piston crown. Also, the lower the gradient value of the heat flux, the higher the heat resistance.
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Vengatesan, S., Paras Yadav, and Edwin Geo Varuvel. "Effect of Alloying Elements and Ceramic Coating on the Surface Temperature of an Aluminum Piston in a Diesel Engine." Journal of Nanomaterials 2022 (October 17, 2022): 1–11. http://dx.doi.org/10.1155/2022/9916742.
Повний текст джерелаАнотація:
The engine piston is subjected to very high temperature during the combustion process, and it is very difficult to control the stability of the geometry at elevated temperature. The stability of the engine piston was analysed by finite element method with steady-state conditions for three different types of approach to control it, where the influence of the alloying element of aluminum piston, influence of surface coating, and its impact on the thickness variation followed by the influence of holes on the coating surface have been analysed in detail. It is observed that the coating with holes shows good agreement with requirement compared to the influence of the alloying element and coated piston. The conduction mode of heat transfer is controlled, and also, the heat transfer to the adjacent components is facilitated by holes on the coated piston.
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Das, Debasish, Rajeev Verma, and Vipul Pathak. "Plasma Sprayed WC-12%Co-Coatings for TBC Applications on Diesel Engine Piston." International Journal of Surface Engineering and Interdisciplinary Materials Science 7, no. 1 (January 2019): 37–54. http://dx.doi.org/10.4018/ijseims.2019010103.
Повний текст джерелаАнотація:
In the present study, plasma sprayed WC-12%Co coatings with 100µm NiCrAlY bond coat on a substrate of A336 cast aluminum alloy have been investigated for a thermal barrier coating (TBC) application. The coatings deposited with varying topcoat thickness up to 500µm were deposited on the piston top surface of an Indian hatchback diesel car to act as a thermal barrier and enhance the thermal efficiency of the engine. Although all the specimens with distinct coating overlays survived 350 thermal cycles, the one with 200µm thickness exhibited the best thermal shock behavior as they exuded the most cycles to surface cracks initiation. Moreover, SEM analysis also suggested 200 µm thick coating to be optimal for thermal shock behavior in diesel engine components. The coating phase analysis by XRD and the lattice strain analysis performed by a Williamson-Hall (W-H) analysis did not reveal any structural changes after the thermal shock experiment.
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Kong, Xiaoli, Bo Zhou, Jixiao Wang, and Wenping Li. "Engineering research of DLC coating in piston pins and bucket tappets." Industrial Lubrication and Tribology 68, no. 5 (August 8, 2016): 530–35. http://dx.doi.org/10.1108/ilt-09-2015-0132.
Повний текст джерелаАнотація:
Purpose The purpose of this paper is to study the engineering application of diamond like carbon (DLC) coatings on the surfaces of piston pins and bucket tappets for a 2.0 L supercharged gasoline engine. The friction loss and durability of DLC-coated components were investigated. Design/methodology/approach The tribological characteristics were examined under oil-lubricated conditions in a CETR UMT reciprocating tribometer. In a motored engine test rig, friction loss torque test was performed to estimate the improvement in fuel economy. Fired engine durability bench tests of typical duration of 450 h were completed to access the durability and wear resistance of DLC coating. Before and after durability tests, coated and uncoated components were measured on the sliding surface by a profilometer technique. Findings Friction and wear test results show that DLC coating has low friction coefficient and reduces the wear rates by almost ten times compared to those of uncoated surfaces. Friction loss measurements indicate that DLC-coated tappets can reduce valve train friction loss by 29 per cent, and DLC-coated piston pins can reduce piston group friction by 11 per cent. Based on fired engine durability bench tests, it is evidenced that none of the coated tappets and pins show any noticeable peeling or delamination. Wear profiles analysis results indicate that DLC-coated engine components give rise to a substantial reduction in wear. Originality/value DLC coating applied onto the working surface of piston pin and bucket tappet can effectively reduce the friction loss of gasoline engine. DLC coating exhibits sufficient durability and improves friction and wear performance.
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Mchedlov, S. G. "Piston rings with a plasma coating." Welding International 22, no. 5 (May 2008): 342–45. http://dx.doi.org/10.1080/09507110802205407.
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Helmisyah, A. J., Shahrir Abdullah, and Mariyam Jameelah Ghazali. "Effect of Thermal Barrier Coating on Piston Crown for Compressed Natural Gas with Direct Injection Engine." Applied Mechanics and Materials 52-54 (March 2011): 1830–35. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.1830.
Повний текст джерелаАнотація:
The top land of a piston normally known as the piston crown is an engine part that is continuously exposed to extreme temperature and pressure during combustion. For a compression ratio level, the compressed natural gas with a direct injection system (CNGDI) typically uses a range of compression ratio between gasoline and diesel engines, producing extremely high temperature and pressure which lead to high thermal stresses. Consequently, the piston crown is exposed to direct combustion due to the vertical movement of the piston, leading to various possible damages of thermal stresses. In contrast to a petrol fuelled internal combustion engine, natural gas combustion creates a dry condition in the combustion chamber, inducing cooling difficulties in the engine. Without good heat transfer, the piston crown materials will soon fail to withstand high temperature and operate effectively. Alternatively, any sort of insulation inside the combustion chamber such as applying ceramic coatings may protect the piston crown surface and affect the overall combustion process, as well as improving the engine performance and the exhaust emissions. By reducing the heat loss of a cylinder bore, a higher thermal efficiency of an engine can also be improved by applying a surface thermal insulation, namely; thermal barrier coating (TBC). Thus, in this study, a ceramic based TBC, yttria partially stabilised zirconia (YPSZ) coating was used to compare with conventional tin coated (Na2SnO3) and uncoated piston crown in terms of heat concentration. Moreover, a set of average value of combustion temperature of a CNGDI engine was selected. Detailed analyses using a finite element analysis (FEA) technique was utilised in order to determine the location of hotspots via distribution profiles of temperature. It was noted that the maximum heat flux of the uncoated piston crown was much higher than that of tin coated and YPSZ coated piston crown. Heat flux value reached about 62% of decrement due to lower conductivity levels of piston crown.
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Shu, Zihao, Jun Deng, Zuoqin Qian, Chunguang Fei, Siwei Zhu, Yuxuan Du, and Kai Zhou. "Thermal Analysis of Mullite Coated Piston Used in a Diesel Engine." Coatings 12, no. 9 (September 5, 2022): 1302. http://dx.doi.org/10.3390/coatings12091302.
Повний текст джерелаАнотація:
Due to special working conditions, diesel engines often need to run stably for a long time at high power operating conditions. As the core of diesel engine moving parts, the piston needs to be exposed to high temperature for a long time. Based on the problem of excessive piston temperature at the maximum power point of a certain type of diesel engine, this paper discussed the protective effect of using different thicknesses of Mullite thermal barrier coating on the top surface of the piston, by using the method of hardness plug temperature measurement and three-dimensional simulation. When the thickness of the ceramic coating was increased from 0.2 to 0.7 mm, the maximum temperature of the piston seat decreased from 358.6 to 338.9 °C. This showed that the use of Mullite thermal barrier coating could reduce the working temperature of the aluminum alloy piston at the maximum load operating point, and greatly improve the reliability of engine components.
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Dearnley, P. A., E. Kern, and K. L. Dahm. "Wear response of crystalline nanocomposite and glassy Al2O3-SiC coatings subjected to simulated piston ring/cylinder wall tests." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 219, no. 2 (April 1, 2005): 121–37. http://dx.doi.org/10.1243/146442005x10300.
Повний текст джерелаАнотація:
The present paper describes the major part of a recent research investigation whose main purpose was to develop a series of novel functional coatings based on the Al2O3-SiC system that ideally would have a nanocomposite microstructure. Such coatings should be well suited for the wear protection of steel and cast-iron piston rings used in automotive internal combustion engines. Two methods were investigated: (i) plasma spraying and (ii) magnetron sputtering. The former was applied to cast-iron and plain carbon steel, whereas the latter was applied to stainless steel piston rings. The plasma sprayed coatings were porous with a hardness of 900-1150 HV, whereas the sputtered coatings were glassy and dense with a hardness of 701-788 HV. High-speed reciprocation wear tests, which simulate the piston ring/cylinder wall environment, were used to assess all coatings. CKS-36 coated cast-iron rings, one of the more common industry standards for this application, were also evaluated. Results showed these to be the most wear resistant. They were smoothly worn, possibly by a microabrasion wear process. The plasma sprayed coatings displayed two main types of wear surface: rough and smooth. The former were mainly generated by a process of grain or particle pull-out, whereas the latter resulted from a combination of microabrasion and microflaking mechanisms. The use of diamond grinding, for finishing the plasma sprayed coatings, mitigated failure through grain pull-out, but wear rates still remained slightly too high compared with uncoated stainless steel and CKS-36 coated cast-iron rings. Most of the sputtered coatings displayed varying degrees of smooth wear which was mitigated as the coating hardness increased. However, this trend was masked by sporadic coating loss through adhesive and/or cohesive failure. The creation of a gradated sputter coating having a core composition based on the Al2O3-SiC variant containing most Si and C and incorporating a bond layer enriched in Cr, adjacent the substrate, eliminated cohesive and adhesive coating failures. Future work should concentrate on the development and evaluation of sputtered crystalline Al2O3-SiC coatings and HVOF sprayed Al2O3-SiC variants. There may also be significant potential in investigating glassy Al2O3-SiC coatings containing significantly higher quantities of Si and C to those reported here.
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Jalaludin, Helmisyah Ahmad, Shahrir Abdullah, Mariyam Jameelah Ghazali, Bulan Abdullah, and Nik Rosli Abdullah. "Effect of Extreme Temperatures on Coated Piston Crown for CNGDI Engine." Applied Mechanics and Materials 393 (September 2013): 281–86. http://dx.doi.org/10.4028/www.scientific.net/amm.393.281.
Повний текст джерелаАнотація:
Due to high temperature and less proper heat transfer, the material of piston crown in an engine of compressed natural gas with a direct injection system (CNGDI) may lead to high thermal stresses and fails to withstand high temperature and operate effectively. By insulating with thermal barrier coating (TBC) such as ceramic-based yttria partially stabilised zirconia (YPSZ), heat transfer to the piston might be reduced and lead to improvement of piston durability. Hence, in this research, YPSZ coating was utilised to differentiate with the uncoated piston crowns in terms of the ability to reduce thermal penetration to the piston. A detailed finite element analysis (FEA) was carried out to determine the location of hotspots via profiles distribution of thermal. In short, it was observed that hotspots were mainly concentrated at the piston bowls rim. The heat flux for the YPSZ/NiCrAl-coated from FEA exhibited about 98% reduction compared to the uncoated piston crown.
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Teng, Dezhi, Jingsi Wang, Chengdi Li, and Xiaoxia Sa. "Investigation of Friction and Wear Behavior of Cast Aluminum Alloy Piston Skirt with Graphite Coating Using a Designed Piston Skirt Test Apparatus." Materials 15, no. 11 (June 5, 2022): 4010. http://dx.doi.org/10.3390/ma15114010.
Повний текст джерелаАнотація:
A piston skirt friction and wear apparatus that simulates the contact and the relative motion of piston and cylinder liner in a real engine has been designed and constructed. With this apparatus, the friction and wear behavior of a cast aluminum alloy piston with a graphite coating under different loads was studied, and the effectiveness of the apparatus was confirmed. The total wear of the piston skirt was higher under a higher load, and the upper part of the skirt surface (around the height of the piston pin) was worn more severely. The wear mechanisms were studied and, based on the test results and surface analyses, three main wear modes were believed to occur in the wear process of the piston skirt: abrasive, adhesive, and fatigue wear. The effects of skirt profile design, coating, and surface texturing on the friction and wear behavior of the piston skirt can be investigated well using the proposed apparatus, which can truly reflect actual working conditions and is useful to improve the tribological performances of piston skirts.
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Mehta, Amrinder, Hitesh Vasudev, Sharanjit Singh, Chander Prakash, Kuldeep K. Saxena, Emanoil Linul, Dharam Buddhi, and Jinyang Xu. "Processing and Advancements in the Development of Thermal Barrier Coatings: A Review." Coatings 12, no. 9 (September 9, 2022): 1318. http://dx.doi.org/10.3390/coatings12091318.
Повний текст джерелаАнотація:
Thermal barrier coating is critical for thermal insulation technology, making the underlying base metal capable of operating at a melting temperature of 1150 °C. By increasing the temperature of incoming gases, engineers can improve the thermal and mechanical performance of gas turbine blades and the piston cylinder arrangement. Recent developments in the field of thermal barrier coatings (TBCs) have made this material suitable for use in a variety of fields, including the aerospace and diesel engine industries. Changes in the turbine blade microstructure brought on by its operating environment determine how long and reliable it will be. In addition, the effectiveness of multi-layer, composite and functionally graded coatings depends heavily on the deposition procedures used to create them. This research aims to clarify the connection between workplace conditions, coating morphology and application methods. This article presents a high-level overview of the many coating processes and design procedures employed for TBCs to enhance the coating’s surface quality. To that end, this review is primarily concerned with the cultivation, processing and characteristics of engineered TBCs that have aided in the creation of specialized coatings for use in industrial settings.
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Li, Wenhua, Baihong Yu, Yutao Lv, Yan Shen, Ruoxuan Huang, and Fengming Du. "Wear Behavior of CuSn Coated Piston Ring Sliding against Nodular Cast Iron Cylinder Liner under Heavy-Duty Conditions." Metals 9, no. 2 (January 27, 2019): 139. http://dx.doi.org/10.3390/met9020139.
Повний текст джерелаАнотація:
In order to investigate the friction and wear behavior between the nodular cast iron cylinder liner (Fe) and CuSn coated piston ring under heavy-duty conditions, piston rings with chromium(Cr) coating and CuSn-Cr coating were tested using the piston ring reciprocating liner test rig at the simulated working conditions of 56 MPa, 200 r/min, 190 °C. Compared with the Cr/Fe pair, the CuSn coating consumption of the CuSn-Cr/Fe pair made friction coefficient and cylinder wear loss decrease by 2.8% and 51.5%, respectively. Different size Sn patches worn from the CuSn coated piston ring were embedded into the cylinder liner surface based on the surface topography. This process was shown to reduce the surface roughness of a cylinder liner and form flatter plateau structures. Chemical elements analysis indicated that plateau structures on the cylinder liner surface matched with CuSn-Cr coated ring are helpful to promote the tribo-chemical reaction and generate the reactive products to protect the mutually contacted asperities.
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Gots, A. N., and S. A. Glinkin. "Analysis of methods for improvement of thermal stability of pistons of tractor diesel engines." Traktory i sel hozmashiny 83, no. 12 (December 15, 2016): 34–38. http://dx.doi.org/10.17816/0321-4443-66282.
Повний текст джерелаАнотація:
The article considers the applied methods for improving the thermal strength of pistons of internal combustion engines. Tractor diesels with combustion chamber in the piston have the greatest rate of temperature change at load rise and release, as well as the highest values of temperature gradients. The highest thermal loads occur in pistons with a semi-open combustion chamber. Periodic thermal loads with high value of temperature gradient lead to thermal fatigue fractures. Such fractures may begin with the appearance of cracks on the edge of combustion chamber. The presence even of a small crack on the edge of combustion chamber leads to its further growth, which can cause the destruction of piston. The main causes of cracks formation on the edge of combustion chamber are the alternating stresses induced from alternating gas pressure in cylinder during the working cycle; the low-frequency oscillations of the piston temperature arising from the changing of operation modes of engine; the high-frequency cyclical thermal oscillations caused by the temperature change of material in the surface layer of combustion chamber for each working cycle. The most common design and technology solutions improving the thermal strength of pistons are the following ones: the change of the edge radius of combustion chamber throat; the reinforcement of combustion chamber edge with more heat-resistant materials; the use of materials with high thermal stability for manufacture of pistons; the artificial heat insulation of piston or its cooling by oil. The disadvantage of use of cooling oil gallery is the acceleration of oil aging process. The alternative solution is to limit the heat supply to the walls of combustion chamber by means of heat protection coating applied by gas-flame, detonation or electric-arc way. The easiest way to improve the thermal strength of diesel piston with a semi-open combustion chamber is the design change.
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CHAVDAROV ANATOLIY V., ANATOLIY V., and VYACHESLAV A. DENISOV VYACHESLAV A. "PROSPECTS OF USING MICROARC OXIDATION TECHNOLOGY FOR INTERNAL COMBUSTION ENGINES." Agricultural engineering, no. 5 (2020): 38–42. http://dx.doi.org/10.26897/2687-1149-2020-5-38-42.
Повний текст джерелаАнотація:
microarc oxidation (MAO) technology. The authors reveal an engine development tendency to replace cast-iron blocks and liners with aluminum ones with special coatings obtained by electroplating methods. It is noted that this method does not involve the use of repair technologies, which signifi cantly aff ects consumer costs. The paper shows the prospects of using MAO technology both in the manufacturing of engine parts and restoration operations. To assess the eff ectiveness of the proposed technology, practical study was performed on covering the working part of the cylinder used in small-size agricultural machinery. The engines were tested at 5.1 kW at 3,600 rpm for 300 hours. After testing, no defects or wear were found on the cylinder face. Preliminary test results of the assembled engine showed no loss of power over 10,000 hours of car mileage, which indicates that the geometric parameters of the parts are preserved. The authors emphasize that the most optimal combination is the friction pair of two parts with an MAO coating. It has been established that the introduction of nano-additives in a MAO-coating leads to a decrease in the coeffi cient of friction between the cylinder and the piston ring and reduces the wear of piston rings and the cylinder face in more than 10 times. A conclusion is made about the feasibility of introducing the considered technology into the mass production of engines and pistons, as well as developing a set of repair equipment.
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Algin, S. G., and K. Yuva raj. "Analyzing of Thermal Barrier Coating in Piston." International Journal of Engineering Trends and Technology 48, no. 1 (June 25, 2017): 55–63. http://dx.doi.org/10.14445/22315381/ijett-v48p210.
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Kennedy, Marcus, Steffen Hoppe, and Johannes Esser. "Piston Ring Coating Reduces Gasoline Engine Friction." MTZ worldwide 73, no. 5 (May 2012): 40–43. http://dx.doi.org/10.1007/s38313-012-0174-x.
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Qin, Wei, and De Yuan Zhang. "Study for the Reason of Chromium Coating Seepage on Piston Rods and the Anti-Seepage by Using Ultrasonic Elliptical Vibration Burnishing Process." Advanced Materials Research 530 (June 2012): 85–90. http://dx.doi.org/10.4028/www.scientific.net/amr.530.85.
Повний текст джерелаАнотація:
In this paper the reason of chromium coating seepage on piston rods is analyzed. The results show that the chromium coating seepage is mainly caused by the net structure of micro-cracks produced in electroplating process. According to this special structure of chromium coating, experiments are made to study the feasibility that the chromium coating is burnished by using the ultrasonic elliptical vibration burnishing (UEVB) process to prevent seepage. The results of study demonstrate that the UEVB process make the micro-cracks on the surface of chromium coating closed or eliminated because the UEVB process could make the chromium coating plastic-forming. Thereby airtightness of piston rods is increased and seepage is prevented approximately. Compressive stress within the material of chromium coating will produce so that the micro-cracks propagation would be restrained and the life of parts is extended.
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Velavan, A., C. G. Saravanan, and M. Vikneswaran. "The Impact of Formation of Oxide Layer on the Piston Crown Using Micro - Arc Oxidation on the Characteristics of the Spark Ignition Engine." Key Engineering Materials 813 (July 2019): 31–36. http://dx.doi.org/10.4028/www.scientific.net/kem.813.31.
Повний текст джерелаАнотація:
In the present study, experiments were conducted to compare the effect of oxide layer formation on the piston crown coated using Micro-Arc Oxidation (MAO) with uncoated piston on the combustion and emission characteristics of the port injected Spark Ignition engine fueled by gasoline. The micro-arc oxidation (MAO) coating technique is the modern process to form a ceramic oxide layer on the reactive metal substrate (base metal) by electrochemical and electro-thermal oxidation in an alkaline electrolytic solution. Using MAO technique, an oxide layer of thickness 72 μm was formed on the piston crown. This oxide layer acts as a thermal barrier to reduce the in-cylinder heat rejection and increase the durability of the piston by withstanding high temperature and pressure produced during combustion. Combustion flames have been captured using the AVL combustion analyzer to analyze the development and propagation of flames within the engine cylinder. From the flame images, it was observed that propagation of flame was faster in MAO coated piston compared to uncoated piston. This is because of higher local temperature inside the combustion chamber that was resulted due to low thermal conductivity of MAO layer. It was also found that carbon monoxide (CO) and hydrocarbon (HC) emissions were reduced as a result of efficient fuel combustion, while NOx emissions increased because of increased combustion temperatures for MAO coated pistons. Keywords: Electro-thermal oxidation, Flame propagation, Micro-arc oxidation, Piston crown, Thermal barrie
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Trismianto, Devout Prakoso. "PENINGKATAN KETAHANAN PANAS MATERIAL PISTON DENGAN PELAPISAN HA." T R A K SI 18, no. 1 (July 12, 2019): 1. http://dx.doi.org/10.26714/traksi.18.1.2018.1.
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Keausan pada piston dikarenakan kondisi kerja piston yang bekerja menahan suhu yang tinggi, tekanan yang besar dan gaya gesek secara terus menerus dalam jangka waktu yang lama,sehingga piston mengalami keausan. Salah satu upaya untuk memperkuat piston yang dilakukan yaitu dengan pelapisan Thermal Barrier Coating. Teknik pelapisan dengan metode thermal barrier coating banyak digunakan didunia penerbangan khususnya untuk pembuatan turbin. Pada penelitian ini, hydroxyapatite telah berhasil dilapiskan pada permukaan substrat piston menggunakan metode thermal barrier coating dengan alat flame spray. Penelitian ini bertujuan untuk meningkatkan ketahanan terhadap thermal dengan melakukan pelapisan hydroxyapatite (HA) yang menggunakan metode flame spray dengan variasi tekanan gas oksigen. Variasi tekanan gas oksigen yang digunakan adalah 4 bar, 5 bar, 6 bar. Untuk melihat karakteristik dan sifat mekanik dilakukan pengujian Scanning electron microscope (SEM) untuk melihat struktur permukaan lapisan, mikroskop makro untuk melihat penampang samping, uji kerekatan untuk mengetahui tingkat kerekatan lapisan dan uji konduktifitas thermal untuk mengetahui sejauh mana lapisan mampu menahan suhu. Hasil pengujian menunjukkan pelapisan dengan tekanan gas oksigen 6 bar mempunyai struktur mikro yang lebih homogen, tidak terlihat porous, difusi secara merata, memiliki nilai kerekatan yang lebih baik yaitu 4B dengan presentase 4% dan sedangkan untuk uji konduktivitas thermal bahan, didapat nilai konduktivitas thermal dari hydroxyapatite sebesar, KHA = 0,295 cal/msK .
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Trismianto, Devout Prakoso. "PENINGKATAN KETAHANAN PANAS MATERIAL PISTON DENGAN PELAPISAN HA." T R A K SI 18, no. 1 (July 12, 2019): 1. http://dx.doi.org/10.26714/traksi.18.1.2018.1-11.
Повний текст джерелаАнотація:
Keausan pada piston dikarenakan kondisi kerja piston yang bekerja menahan suhu yang tinggi, tekanan yang besar dan gaya gesek secara terus menerus dalam jangka waktu yang lama,sehingga piston mengalami keausan. Salah satu upaya untuk memperkuat piston yang dilakukan yaitu dengan pelapisan Thermal Barrier Coating. Teknik pelapisan dengan metode thermal barrier coating banyak digunakan didunia penerbangan khususnya untuk pembuatan turbin. Pada penelitian ini, hydroxyapatite telah berhasil dilapiskan pada permukaan substrat piston menggunakan metode thermal barrier coating dengan alat flame spray. Penelitian ini bertujuan untuk meningkatkan ketahanan terhadap thermal dengan melakukan pelapisan hydroxyapatite (HA) yang menggunakan metode flame spray dengan variasi tekanan gas oksigen. Variasi tekanan gas oksigen yang digunakan adalah 4 bar, 5 bar, 6 bar. Untuk melihat karakteristik dan sifat mekanik dilakukan pengujian Scanning electron microscope (SEM) untuk melihat struktur permukaan lapisan, mikroskop makro untuk melihat penampang samping, uji kerekatan untuk mengetahui tingkat kerekatan lapisan dan uji konduktifitas thermal untuk mengetahui sejauh mana lapisan mampu menahan suhu. Hasil pengujian menunjukkan pelapisan dengan tekanan gas oksigen 6 bar mempunyai struktur mikro yang lebih homogen, tidak terlihat porous, difusi secara merata, memiliki nilai kerekatan yang lebih baik yaitu 4B dengan presentase 4% dan sedangkan untuk uji konduktivitas thermal bahan, didapat nilai konduktivitas thermal dari hydroxyapatite sebesar, KHA = 0,295 cal/msK .
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Фролов, Е. А., С. В. Попов, С. Г. Ясько та О. В. Орисенко. "ДЕТОНАЦІЙНО-ГАЗОВЕ ЗМІЦНЕННЯ ДЕТАЛЕЙ ДВИГУНІВ ВНУТРІШНЬОГО ЗГОРАННЯ". Open Information and Computer Integrated Technologies, № 91 (18 червня 2021): 55–61. http://dx.doi.org/10.32620/oikit.2021.91.04.
Повний текст джерелаАнотація:
The paper deals with improving the reliability and durability of parts of the cylinder-piston group of internal combustion engines. Strengthening of machine parts is possible through the use of special production processes. Modern materials and coatings must be able to meet high operating temperatures and loads.Chrome plating, boriding and ion-plasma spraying do not meet the established quality requirements. The aluminum piston suffers damage in the head area. This manifests itself in the accumulation of cracks, channels, and traces of alloy washout. In addition, due to heating, the strength of the aluminum alloy becomes worse more than 2 times.It is proposed to create and use a coating that would withstand operating temperatures of more than 2000°C, as well as shock-pulsating loads. A detonation-gas spraying method is proposed. It is characterized by the versatility of materials and can be applied to polymers and to refractory ceramics, as well as to any metals and alloys.The deposited particles have high kinetic energy. The coating is characterized by high strength, which reaches 180 ... 200 MPa, hardness HRCe 60, and minimal cracks. The temperature effect during spraying on the workpiece is negligible. A sequence of preparatory operations is proposed. The piston and glow ring on the UN-102 detonation-gas installation were to be strengthened. A manipulator was used that uses the energy of the installation shot.The resulting surfaces are characterized by a regular macrostructure (waviness). A nickel-aluminum alloy was applied. Coating thickness was about 150 ... 270 microns, hardness was of HV 550, adhesion to the base eas of 94 ... 100 MPa. The results of studies on the parts of the cylinder-piston group showed a decrease in operating temperatures due to the running-in of the coating and high-quality sealing of the combustion chamber.The durability of the rings is 1.6·106…2.3·106, which indicates a significant increase in fatigue resistance and service life. The proposed technology is suitable and recommended for implementation in mass production
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Maksarov, Vyacheslav, and V. Krasnyy. "The Formation of Surface Roughness of Piston Rings for the Purpose of Improving the Adhesion of Wear-Resistant Coatings." Key Engineering Materials 736 (June 2017): 73–78. http://dx.doi.org/10.4028/www.scientific.net/kem.736.73.
Повний текст джерелаАнотація:
The paper considers the application of wear resistant coatings by methods of gas thermal and flame spraying. It demonstrates the relationship between adhesion strength of the sprayed coating and surface roughness after abrasive jet machining using piston rings with steel-molybdenum coating as an example. The authors consider the results of studies aimed defining the relationship between surface roughness and of jet-abrasive machining conditions: the distance between the nozzle exit and the workpiece, the number of passages, the operating air pressure and frequency of the shot swapping.
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Isaac, Festus O. "A Review of Coating Methods and Their Applications in Compression and Spark-Ignition Engines for Enhanced Performance." FUOYE Journal of Engineering and Technology 7, no. 2 (June 30, 2022): 217–21. http://dx.doi.org/10.46792/fuoyejet.v7i2.810.
Повний текст джерелаАнотація:
Coating of metallic surfaces such as cylinder heads, cylinder liners, piston heads and exhaust-valves in Internal Combustion Engines (ICEs) has improved engine performance in areas of brake-thermal-efficiency including brake-specific-fuel consumption, etc. This review showed different methods of coating in compression and spark-ignition engines for improved performance using different coating thicknesses on the metallic surfaces. These coating thicknesses may be either minimum or maximum depending on the coating method used. The coating methods discussed in this paper were Thermal Spraying (TS), Physical-Vapour Deposition (PVD), Chemical-Vapour Deposition (CVD) and Ion Implantation methods. Minimum thicknesses were achieved using the PVD, CVD and Ion-Implantation methods. In addition, Sol-Gel and Slurry coatings were also discussed. Having considered these methods of coating, thermal-spraying method was recommended for compression and spark-ignition engines because it produces temperature ranging from 8000 K-14000 K on surfaces with thick coating thicknesses.
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R, Suresh, Subash Chandra Bose.R, Arumugam K, Anbazhagan R, and Sathiyamoorthy V. "EXPERIMENTAL INVESTIGATIONS ON METHANOL FUELLED D.I DIESEL ENGINE WITH CATALYTIC COATINGS ASSISTED BY GLOW PLUG." JOURNAL OF ADVANCES IN CHEMISTRY 13, no. 7 (February 13, 2017): 6341–47. http://dx.doi.org/10.24297/jac.v13i7.5718.
Повний текст джерелаАнотація:
       A comprehensive study on the methanol with three different types of Catalytic coatings assisted by Glow Plug is discussed in this paper. A four stroke single cylinder water cooled D.I diesel engine was adopted for the experiment. The present study aims to evaluate the Performance and Emission characteristics level of methanol fuel with three types of catalytic coatings assisted by Glow Plug. The catalytic coatings have established enhanced rate of combustion, which results in increased brake thermal efficiency. These methods of coating are selected based on generally available technologies and reviews of several researchers through their literature reviews. In this study, the diesel engine was tested using methanol coated with three types of  catalytic coatings  namely  Copper,  Aluminium  oxide,  and  Chromium  oxide  and  assisted  by  Glow Plug respectively. The influence of various catalytic coatings in combustion chamber(cylinder head inner surface, piston, valve) results in tremendous changes in the various parameters of the GHSI engine. The Exhaust temperature for Copper coating was higher compared to Aluminium oxide coating and Chromium oxide coating. It is noticed that, brake thermal efficiency was thus improved in almost all operation conditions with the Methanol fuels. The HC and  CO emissions are higher at Methanol fuelled with Copper coating. NOx and Smoke emissions are lower for Chromium oxide coating compared to Copper coating and Aluminium oxide coating. Among all coatings, Copper coating exhibits better efficiency and lower emission compared to other coatings.