Academic literature on the topic 'High Performance Plasma Coating process'
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Journal articles on the topic "High Performance Plasma Coating process"
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Liu, Ming, Hai Jun Wang, Yi Jiang, Yong Ming Guo, and Ke Ke Zhao. "Experimental Analysis on the Environment of Internal Plasma Spraying Techniques." Applied Mechanics and Materials 184-185 (June 2012): 1480–85. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.1480.
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The effects of internal spraying environment on the microstructures and mechanical properties of plasma spraying NiCrBSi+15%Mo coatings were investigated. For experimental analysis of spraying environment, a specialized internal plasma device and its test unit were developed. Firstly, microstructures of spraying coatings and powders were analyzed by scanning electron microscopy (SEM). Furthermore, the boding strength, porosity and micro-hardness of the coatings were investigated and determined separately. According to these properties of plasma spraying coating, the influence of spraying environment on the coating properties and specimen temperature could be investigated. The results show that that the coating performances decreased because of the dust, smog and high temperature of the internal spraying environment. The high-performance internal coatings can be obtained by properly designing spraying process and using the special spraying device.
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Kriba, Ilhem, and A. Djebaili. "The Interaction between Particles and a Plasma Beam in the Thermal Projection Process." Advanced Materials Research 83-86 (December 2009): 801–9. http://dx.doi.org/10.4028/www.scientific.net/amr.83-86.801.
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Plasma spray processes have been widely used to produce high performance coatings of a wide range of Materials (metallic, non-metallic, ceramics), offering protection from, eg. wear, extreme temperature, chemical attack and environmental corrosion. To obtain good quality coatings, spray parameters must be carefully selected. Due to the large variety in process parameters, it is difficult to optimize the process for each specific coating and substrate combinations. Furthermore modelling the spray process allows a better understanding of the process sequences during thermal spraying. Good agreement of the virtual spraying process with the real coating formation is achieved by modelling the particular process steps. The simulation of coating formation to estimate the process parameters is an important tool to develop new coating structures with defined properties. In this work, the process of plasma sprayed coating has been analyzed by numerical simulation. Commercial code is used to predict the plasma jet characteristics, plasma –particle interaction, and coating formation. Using this model we can obtain coating microstructure and characteristics which form a foundation for further improvement of an advanced ceramic coating build up model.
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KOECH, Pius Kibet, and Chaur Jeng WANG. "Performance Characteristics of Hot-dip and Plasma Spray Aluminide Coated Nickel-Based Superalloy 718 under Cyclic Oxidation in Water Vapour." Materials Science 25, no. 4 (June 27, 2019): 413–21. http://dx.doi.org/10.5755/j01.ms.25.4.21334.
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Aluminium coating due to its ability to form stable alumina oxide scale are commonly used to protect materials such as inconel 718 superalloys at high operational temperatures. Relevant properties of the oxide scale formed; growth rate and coating adherence is not only determined by the composition of the coating material used but is also influenced by the coating manufacturing process and the test condition. In the present work, effect of water vapour and thermocycling commonly prevailing on the morphology and composition of the alumina scales formed during high temperature oxidation was studied using hot-dip and plasma spray aluminium coatings. The coatings highly improved oxidation resistance of the alloy substrate with hot dip coating showing the lowest mass change compared to plasma spray. The results also show that the hot-dip coating has an inherently different morphology and growth rate compared to those formed on the plasma spray coating. High rate of oxidation, spallation and large voids with little protective alumina oxide layer were observed in moist condition test especially in plasma spray coatings.
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Kobayashi, Akira. "Performance of Thick TiN Composite Coating as High Heat Resistant TBC." Materials Science Forum 502 (December 2005): 511–16. http://dx.doi.org/10.4028/www.scientific.net/msf.502.511.
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Titanium nitride (TiN) coating has excellent properties and has been already used in the various field of industry. But TiN film has problems in the formation process: i.e., low deposition rate and poor thickness of the film. TiN thick coatings can be formed by means of the gas tunnel type plasma reactive spraying in a short time operation. In this study, the fundamental characteristics of this method were investigated by measuring the properties of the titanium nitride (TiN) coatings formed on the traversed stainless steel substrate. Consequently, TiN coatings of 200µm thickness were obtained at P=27kW, within t=5s, and some coating characteristics which depend on the spraying distance, the environmental gas, traverse number etc. were clarified. And the performance of TiN thick composite coating was discussed as a heat resistant TBC.
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Kriba, Ilhem R., and A. Djebaili. "Modelling Sequential Impact of Molten Droplets on a Solid Surface in Plasma Spray Process." Advanced Materials Research 227 (April 2011): 111–15. http://dx.doi.org/10.4028/www.scientific.net/amr.227.111.
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Plasma spray deposition is one of the most important technologies available for producing the high-performance surfaces required by modern industry. In this process, powder of the coating material is fed into high-temperature plasma, which melts and accelerates the powder; the molten particles subsequently hit and solidify on the surface to be coated. To obtain good quality coating, the powder particle must be at least partially molten and hit the substrate with a high velocity. The flattening characteristics of the droplets impinging on a substrate are important determinants in governing the eventual quality of the plasma spray coating. Different codes have been developed in recent years to simulate the overall thermal spraying process, as well as the growth of the 3D coatings, in which entrained particles are modeled by stochastic particle models, fully coupled to the plasma flow. The present investigation was carried out to have an approach to systematize the atmospheric plasma spraying process in order to create a basis for numerically modeling the plasma dynamics, the coating formation mechanisms and to predict the particle thermo- kinetic state at impact.
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Abraham, D. S. Manoj, H. Kanagasabapathy, S. Kartheesan, and M. C. Shaji. "Dry Sliding Wear Behaviour of Al 7075 T6 Coated by Plasma Spray Process." Advanced Materials Research 984-985 (July 2014): 551–56. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.551.
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-Al7075 T6 alloys are widely used in the aircraft, automotive and die and mold making industry, yet at any time aluminium components should be designed with a third body or in an harsh environment they must be protected with an overlying coating inorder to increase their useful lifespan and improve their surface performance especially in wear and corrosion. The most wide spread technique used to modify the surface properties of Al7075 T6 among them one of the most promosing technology is plasma spraying. It is widely used to manufacture anti-wear and anti-corrosion coatings on to a large class of bulk materials. Extreme performance and high flexibility are the Main characteristic of the coatings achievable by Plasma Spray process. In this work Nickel Carbide + Chromium Composite coating was successfully prepared and deposied with various thicknesses on the Aluminium alloy surface. Nickel Carbide + Chromium composite coating exhibits a significantly increased wear resistance property in the material. The result obtained in this work indicated that the plasma spraying method will be the promising process to coat the composite coating on aluminium based alloy.Keywords: Al 7075 T6, Plasma Spray Process, Nickel Carbide + Chromium
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Kobayashi, Akira. "Enhancement of TBC (Thermal Barrier Coatings) Characteristics by Gas Tunnel Type Plasma Spraying." Materials Science Forum 539-543 (March 2007): 1061–66. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1061.
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Zirconia (ZrO2) coating formed by plasma spray method is widely used industrially as a thermal barrier coating (TBC). Presently, there are some problems such as spallation and cracks inside the coating. As one solution given by the development of new spaying processing, the gas tunnel type plasma spraying is one of excellent method to enhance the TBC performances. The zirconia-alumina (ZrO2-Al2O3) composite coating formed by this method has a high hardness layer at the surface side of the coating, which shows the graded functionality of hardness, and is superior as a TBC. In this paper, the performance of such high hardness ZrO2-Al2O3 composite coating was investigated and the merit as TBC was clarified. The Vickers hardness of the high hardness layer near the coating surface increased by the thermal process of high energy plasma, which corresponded to the result that the coating became denser. Also, the effect of alumina mixing was discussed about the microstructure of this composite coating. The combination of high hardness of Al2O3 with the low thermal conductivity of ZrO2 resulted to the development of high performance TBC. The transverse thermal conductivity of such ZrO2-Al2O3 composite coatings was proved to be much smaller than that in the longitudinal direction.
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Krioni, N. K., A. D. Mingazhev, and I. R. Kuzeev. "Application of Ion-Plasma Coatings with Low Droplet Phase Content." Materials Science Forum 870 (September 2016): 334–38. http://dx.doi.org/10.4028/www.scientific.net/msf.870.334.
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Ion-plasma coating application technologies are the most advanced ones providing high performance characteristics for the parts of modern machinery and equipment. Further development of these technologies is connected with the improvement of efficiency, production processes, and quality of protective and strengthening coatings. The methods and installations for applying protective coatings by deposition of coating materials from vacuum arc plasma with the use of electric arc evaporators of metals are widely known. However, one of the main shortcomings of the existing technologies based on the use of electric arc evaporators is a high content of the droplet phase in the coating, resulting in a sharp performance reduction. In this paper, the authors propose a new approach to the process of ion-plasma material application, providing the implementation of a number of principles that improve the quality of the applied coating due to the significant reduction of the droplet phase.
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Zhu, Sheng, and Bin Shi Xu. "High-Performance Ceramic Coatings Sprayed via Novel Supersonic Plasma Spraying System." Key Engineering Materials 280-283 (February 2007): 1203–6. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1203.
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A novel supersonic plasma spraying system was developed with a maximum power of 80 kW and a maximum working gas flow of 6 m3/h, at which gas and particle velocities of 2400 and 600 m/s can be achieved respectively. This paper deals with novel supersonic plasma spraying system design, the structure of novel supersonic plasma gun includes a special Laval nozzle as the single anode and inner powder supply, and the mechanisms of supersonic plasma jet as well as the effects on the sprayed particles. The spraying process parameters of several ceramic powders such as Al2O3, Cr2O3, ZrO2, Cr3C2 and Co-WC were optimized. The properties and microstructure of the sprayed ceramic coatings were investigated. Nano Al2O3-TiO2 ceramic coating sprayed by using novel supersonic plasma spraying was also studied. Novel supersonic plasma spraying improves greatly ceramic coatings quality compared with conventional air plasma spraying (Metco 9M), as well as it has lower energy and gas exhaustion compared with high power supersonic plasma spraying (Plazjet), which can spray high-performance ceramic coatings at low cost.
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Kiilakoski, Jarkko, Richard Trache, Stefan Björklund, Shrikant Joshi, and Petri Vuoristo. "Process Parameter Impact on Suspension-HVOF-Sprayed Cr2O3 Coatings." Journal of Thermal Spray Technology 28, no. 8 (October 31, 2019): 1933–44. http://dx.doi.org/10.1007/s11666-019-00940-7.
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Abstract Chromium oxide (Cr2O3) is commonly used as an atmospheric plasma-sprayed (APS) coating from powder feedstock in applications requiring resistance to sliding wear and corrosion, as well as amenability to texturing, e.g., in anilox rolls. Recently, high-velocity oxy-fuel spray methods involving suspension feedstock have been considered an extremely promising alternative to produce denser and more homogeneous chromium oxide coatings with lower as-sprayed surface roughness, higher hardness and potentially superior wear performance compared to conventional APS-sprayed coatings. In this study, the impact of process parameters namely auxiliary air cleaning nozzles and a transverse air curtain on suspension high-velocity oxy-fuel-sprayed Cr2O3 suspensions is presented. The produced coatings are characterized for their microstructure, mechanical properties and wear resistance by cavitation erosion. The results reveal the importance of optimized air nozzles and air curtain to achieve a vastly improved coating structure and performance.
Dissertations / Theses on the topic "High Performance Plasma Coating process"
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Bao, Yuqing. "Plasma spray deposition of polymer coatings." Thesis, Brunel University, 1995. http://bura.brunel.ac.uk/handle/2438/5152.
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This work investigates the feasibility of the use of plasma spray deposition as a method of producing high performance polymer coatings. The work concentrates on the understanding of the processing of the plasma spraying of polymers, the behaviour of polymeric materials during deposition, and the study of process-structure-properties relationships. Processing modelling for the three stages of the evolution of a polymer deposit (droplet-splat-coating) has been carried out using heat transfer theory. A theoretical model is proposed which consists of three parts: the first part predicts the temperature profile of in-flight particles within plasma jet, the second part predicts the cooling of isolated splats impacting on a substrate and the third part, the heat transfer through the coating thickness. The heat transfer analysis predicts that the development of large temperature gradients within the particle is a general characteristics of polymers during plasma spraying. This causes difficulties for polymer particles to be effectively molten within the plasma jet without decomposition. The theoretical calculations have predicted the effect of processing parameters on the temperature, the degree of melting and decomposition of in-flight polymer particles. With the aid of the model, the conditions for the preparation of high integrity thermoplastic deposits have been established by the control of the plasma arc power, plasma spraying distance, feedstock powder injection, torch traverse speed and feedstock particle size. The optimal deposition conditions are designed to produce effective particle melting in the plasma, extensive flow on impact, and minimal thermal degradation. The experimental work on optimizing processing parameters has confirmed the theoretical predictions. Examination of polymer coating structures reveals that the major defects are unmelted particles, cracks and pores. Five major categories of pores have been classified. It also revealed a significant loss in crystallinity and the presence of a minor metastable phase in the plasma deposited polyamide coatings due to rapid solidification. The study has indicated that the molecular weight of a polymer plays an important role on the splat flow and coating structure. Under non-optimal deposition condition, substantial thermal degradation occurred for which a chain scission mechanism is proposed for plasma deposited polyamide coatings. There are difficulties in achieving cross-linking during plasma spray deposition of thermosets. The theoretical calculations predict that adequate cross-linking is unlikely in a coating deposited under normal conditions, but preheating the substrate to above the cross-linking temperature improves the degree of cross-linking of the coatings substantially. In addition, the coating thickness has a major effect on the degree of cross-linking of thermosets. The calculations also predict that lowering the thermal conductivity by applying a thermal barrier undercoat and using a faster curing agent to reduce time required for the cross-linking reaction can improve the degree of cross-linking of thermoset deposits. The experimental results for the degree of cross-linking and wear resistance confirmed these predictions.
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UHLMANN, FRANZISKA JOHANNA LUISE. "Protective Ultra-High Temperature Coatings/ Ceramics (UHTCs) for Ceramic Matrix Composites in Extreme Environments." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2644372.
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This thesis is focused on the development of a protective coating system for Cf/SiC SiCARBONTM (Airbus trademark) materials against very high temperatures in extreme environment. Here, we concentrate on the application of this technology in combustion chambers, for example in orbital thrusters. During combustion, the composite material needs to be protected against oxidation caused by the extreme conditions. With the aim to increase the combustion performance using higher temperatures (up to 1850 °C), this thesis deals with the replacement of the current Environmental Barrier Coating (EBC) solution (CVD-SiC coating, Chemical Vapor Deposition) by an Ultra High Temperature Ceramic (UHTC) based coating system. Different challenges of this approach are, for instance, the CTE mismatch between Cf/SiC and UHTC materials and the feasibility to create a dense, thick and adherent UHTC based coating on the hot gas wall (inner wall) of a small combustion chamber.
In this work, a suitable coating process (High Performance Plasma Coating process, HPPC) for inner wall coatings is selected and further developed to create ZrB2 based coatings on Cf/SiC based substrate materials. Based on a parameter study, the coating quality of HPPC based ZrB2 coatings is optimized depending on plasma current, chamber pressure, powder flow rate, preheating and cooling rate. HPPC coatings with different material combinations (ZrB2, ZrB2-SiC, ZrB2-TaC, ZrB2-LaB6) are investigated regarding coating adhesion, voids, composition and thermo-chemical behavior within a combustion chamber-like environment.
To decrease the CTE mismatch between Cf/SiC substrate and a ZrB2 based coating and to increase the thermo-chemical resistance of the composite, the SiC matrix material is modified by ZrB2 and Ta additions. Cf/SiC-ZrB2-TaC composites with different SiC/ZrB2-TaC ratios are fabricated and investigated regarding microstructure, chemical composition and material properties (physical, thermo-physical, mechanical and thermo-chemical). The adhesion of HPPC based ZrB2 coatings on Cf/SiC composites is enhanced by a ZrB2 and TaC matrix modification.
Based on the results, interactions between process parameters, coating composition and substrate material are analyzed and provide the base for ZrB2 based EBCs of the inner wall coatings on Cf/SiC based components. By means of the obtained findings, the potential of several material systems is derived in order to develop a protective coating for long-term applications in combustion chamber environments.
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Roy, Jean-Michel L. "Development of Cold Gas Dynamic Spray Nozzle and Comparison of Oxidation Performance of Bond Coats for Aerospace Thermal Barrier Coatings at Temperatures of 1000°C and 1100°C." Thesis, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20681.
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The purpose of this research work was to develop a nozzle capable of depositing dense CoNiCrAlY coatings via cold gas dynamic spray (CGDS) as well as compare the oxidation performance of bond coats manufactured by CGDS, high-velocity oxy-fuel (HVOF) and air plasma spray (APS) at temperatures of 1000°C and 1100°C. The work was divided in two sections, the design and manufacturing of a CGDS nozzle with an optimal profile for the deposition of CoNiCrAlY powders and the comparison of the oxidation performance of CoNiCrAlY bond coats. Throughout this work, it was shown that the quality of coatings deposited via CGDS can be increased by the use of a nozzle of optimal profile and that early formation of protective α-Al2O3 due to an oxidation temperature of 1100°C as opposed to 1000°C is beneficial to the overall oxidation performance of CoNiCrAlY coatings.
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Alaluss, Khaled Ahmed. "Modellbildung und Simulation des Plasma-Schweißens zur Entwicklung innovativer Schweißbrenner." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-216002.
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In der vorliegenden Habilitationsarbeit wurden technisch-konstruktive Lösungsansätze basierend auf einem entwickelten strömungs-thermomechanischen/magneto-hydro-dynamischen Simulationsmodell zur Entwicklung/Charakterisierung eines physikalischen Prozesswirkprinzips des betrachteten Mikro- und Hochleistungs- sowie Orbital-Plasma-Schweißprozesses und dessen physikalischer Effekte entwickelt. Dabei wurden die differenten Einflussgrößen beim Plasmaschweißprozess erfasst, analysiert und ihre Wirkung auf Schweißprozessverhalten und Brennerkonstruktion charakterisiert. Die damit gewonnenen Ergebnisse wurden zur werkstofflichen, technisch-konstruktiven Entwicklung der Brennerkopfmodelle hinsichtlich der Ausführungsgeometrien des Prozessgaszuführungs- und Brennerkühlsystems genutzt. Im Rahmen des erarbeiteten thermomechanischen Simulationsmodells wurden die beim Plasma-Auftragschweißen von Verbundbauteilen auftretenden Temperaturfelder, Verformungen und Eigenspannungen vorausbestimmt, untersucht und analysiert. Mittels des erarbeiteten Simulationsmodells wurden werkstoffliche, konstruktive und fertigungstechnische Maßnahmen zur Minimierung/Beeinflussung schweißbedingter Verformungen und Eigenspannungen simulativ untersucht und bewertetIn this work, technical and constructive solutions were developed based on simulation models (process and structural) for fluid mechanical, thermomechanical and magneto-hydrodynamic effects. The simulation process included improving and characterising the physical operating principles for micro plasma welding, high performance plasma welding and orbital plasma welding. Also, the physical effects for the above plasma welding processes were studied and analysed. From these different physical properties of the parameters for the plasma welding processes, and their effects on plasma welding process behaviour and torch design were analysed and characterised. The results were used for the development and construction of plasma welding torch models, which included material selection and geometrical design such as, process gas supply design, torch cooling system design, and other related torch designs. By developing the thermomechanical simulation model, deformations and residual stresses that were generated by heating during the plasma welding process were investigated and analysed. The developed thermomechanical model included material, structural and welding specifications such as buffering and preheating. Simulations utilizing this model were used in order to reduce the residual stresses and deformations of the welded components
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Alaluss, Khaled Ahmed. "Modellbildung und Simulation des Plasma-Schweißens zur Entwicklung innovativer Schweißbrenner." Universitätsverlag Chemnitz, 2015. https://monarch.qucosa.de/id/qucosa%3A20614.
Full textAbstract:
In der vorliegenden Habilitationsarbeit wurden technisch-konstruktive Lösungsansätze basierend auf einem entwickelten strömungs-thermomechanischen/magneto-hydro-dynamischen Simulationsmodell zur Entwicklung/Charakterisierung eines physikalischen Prozesswirkprinzips des betrachteten Mikro- und Hochleistungs- sowie Orbital-Plasma-Schweißprozesses und dessen physikalischer Effekte entwickelt. Dabei wurden die differenten Einflussgrößen beim Plasmaschweißprozess erfasst, analysiert und ihre Wirkung auf Schweißprozessverhalten und Brennerkonstruktion charakterisiert. Die damit gewonnenen Ergebnisse wurden zur werkstofflichen, technisch-konstruktiven Entwicklung der Brennerkopfmodelle hinsichtlich der Ausführungsgeometrien des Prozessgaszuführungs- und Brennerkühlsystems genutzt.
Im Rahmen des erarbeiteten thermomechanischen Simulationsmodells wurden die beim Plasma-Auftragschweißen von Verbundbauteilen auftretenden Temperaturfelder, Verformungen und Eigenspannungen vorausbestimmt, untersucht und analysiert. Mittels des erarbeiteten Simulationsmodells wurden werkstoffliche, konstruktive und fertigungstechnische Maßnahmen zur Minimierung/Beeinflussung schweißbedingter Verformungen und Eigenspannungen simulativ untersucht und bewertet.In this work, technical and constructive solutions were developed based on simulation models (process and structural) for fluid mechanical, thermomechanical and magneto-hydrodynamic effects. The simulation process included improving and characterising the physical operating principles for micro plasma welding, high performance plasma welding and orbital plasma welding. Also, the physical effects for the above plasma welding processes were studied and analysed. From these different physical properties of the parameters for the plasma welding processes, and their effects on plasma welding process behaviour and torch design were analysed and characterised. The results were used for the development and construction of plasma welding torch models, which included material selection and geometrical design such as, process gas supply design, torch cooling system design, and other related torch designs. By developing the thermomechanical simulation model, deformations and residual stresses that were generated by heating during the plasma welding process were investigated and analysed. The developed thermomechanical model included material, structural and welding specifications such as buffering and preheating. Simulations utilizing this model were used in order to reduce the residual stresses and deformations of the welded components.
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Chen, Yi-Siou, and 陳毅修. "Effect of Cryogenic Treatment on Microstructural Characteristics and Corrosion Behavior of High-Chromium Cast Iron Coating on Spheroidal Graphite Cast Iron Deposited by Plasma Transferred Arc Process." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/89849281870265010959.
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碩士遠東科技大學
機械工程研究所
103
Spheroidal graphite (SG) cast iron and medium carbon steel with high chromium cast iron surface coating are mainly used in wear rings, finishing rolls of hot rolled flat products, forming molds, furnace liners, cement crushers and grinding balls in mining and ducting equipment etc. Since these components may encounter problems such as abrasive wear, erosive wear and corrosion in the aforementioned applications, a common method for enhancing strength and hardness of these wearable components is the plasma transferred arc (PTA) overlaying process for surface modification of steel substrates. High chromium cast iron has a microstructure that mainly consists of austenite and M7C3 carbides in the as-cast state and the colony pattern unique to the M7C3 carbides gives it greater hardness and wear resistance. Therefore, overlaying the surface of these wearable components with high chromium cast iron is used to improve the performance of wearable materials and resistance against erosive wear on the surface of SG cast iron and medium carbon steel. Cryogenic treatment on the other hand places materials in a low temperature environment that is below -150℃ so that they drop to a temperature below Mf (total martensitic transformation temperature), which causes austenite to be almost totally transformed into martensite, thereby achieving the purpose of strengthening materials and removing residual austenite. As such, this project aims at surface modification of SG cast iron and medium carbon steel through a cryogenic treatment or addition of carbide reinforcing phases in combination with the PTA overlaying process as well as high chromium cast iron based overlay alloy, which is commonly used in rolls and crushers in mining and cement industries. High chromium cast iron overlayers with different dilution rates are obtained by differentiating overlaying current (heat input level) and chemical composition of substrates in the PTA overlaying process with fixed travel speed, gas flow and powder feed rates to individually examine conditions for the cryogenic treatment (destabilization temperature) in an attempt to identify the optimal conditions for the cryogenic treatment of high chromium cast iron overlayers with different dilution rates, thereby obtaining the cryogenically treated high chromium cast iron overlayer that has the greatest resistance against wear and erosion. The experimental results show that hardness values of the PTA high chromium cast iron overlayers tend to reduce as the overlaying current increases. Polarization of these overlayers reveals that the specimens subject to overlyaing current of 90A exhibit greater resistance against corrosion. Hardness values of the cryogenically treated overlayers tend to increase as the destabilization temperature rises. On the other hand, X-ray diffraction analysis shows that these overlyaers and the cryogenically treated ones mainly have the following consistent phases: martenite, austenite, M7C3 and M3C. Polarization of the cryogenically treated overlayers reveals that the specimens subject to overlyaing current of 90A, after the destabilization treatment at 900℃ followed by the cryogenic treatment, exhibit lower corrosion potential (Ecorr.) and current density (Icorr.) in the etching solution that consists of 3.5 wt.% NaCl artificial seawater. Therefore, the two treatments can give the overlayers greater corrosion resistance. Keywords: Plasma transferred arc, high chrome cast iron, Spheroidal graphite cast iron, Cryogenic Treatment
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WANG, LIEN-JEN, and 王連任. "Study on Preparation and Manufacturing Process of UV curing Formulation of High Performance Hard Coatings by way of Roll-to-Roll Precision Printing and Coating Technology." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/p753kr.
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碩士世新大學
圖文傳播暨數位出版學研究所(含碩專班)
107
Taiwan’s printing industry has made great progress in the green manufacturing process reform in recent years, especially in the Roll to Roll light-weighting technology. As a tendency of heavy demands by both Thinning and high production capacity for film coating, to increase the efficiency of film surface with scratch resistance by utilizing the UV curing technology thus becomes significant importance. Nevertheless, operating the thin and high hardness coating material in a narrow space easily lead to the film of surface damages cause in poor coating process or poor coating flatness. For that reason, the film mechanical properties turn out to be the significantly designing parameters when obtaining optimum coating performance. For the coated or printed substrate, SKC SH88H PET optical film is selected for SKC Jiangsu High Tech Plastics Co., Ltd., TORAY UY42 PET optical film for TORAY Yihua TORAY Polyester Film Co., Ltd., (YTP) and SHINKONG C879 Optical Film for Shinkong Materials Technology Co., Ltd., a subsidiary of Shinkong synthetic fibers CORP., and Nan Ya CH995Y optical film are PET products produced by Nan Ya Plastics Corporation. All films of thickness are 100μm and the surfaces are pre-coated with Primer. This thesis refers to pencil hardness test method combined with abrasion resistance and so on integrates full spectrum transmittance test with UV curing synthetic composition and micro gravure coating with non-contact drying technology, so as to obtain high price-performance Ratio. When the physical properties and mechanical behaviors of the plastic materials as well as planning of process integration are profoundly understood and correctly chosen at the beginning of designing the hard coating structure, it is also to prevent the occurrence of poor coating process and poor coating flatness. The purpose of the research is to use of green coating materials without VOCs. All materials do not affect the basic principles of environment and health. Hope on the process and products can meet the green products of the green industry.
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Ali, Md Mohsin. "High Performance Fault-Tolerant Solution of PDEs using the Sparse Grid Combination Technique." Phd thesis, 2016. http://hdl.handle.net/1885/109292.
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The data volume of Partial Differential Equation (PDE) based
ultra-large-scale scientific simulations is increasing at a
higher rate than that of the system’s processing power. To
process the increased amount of simulation data within a
reasonable amount of time, the evolution of computation is
expected to reach the exascale level. One of several key
challenges to overcome in these exascale systems is to handle the
high rate of component failure arising due to having millions of
cores working together with high power consumption and clock
frequencies. Studies show that even the highly tuned widely used
checkpointing technique is unable to handle the failures
efficiently in exascale systems. The Sparse Grid Combination
Technique (SGCT) is proved to be a cost-effective method for
computing high-dimensional PDE based simulations with only small
loss of accuracy, which can be easily modified to provide an
Algorithm-Based Fault Tolerance (ABFT) for these applications.
Additionally, the recently introduced User Level Failure
Mitigation (ULFM) MPI library provides the ability to detect and
identify application process failures, and reconstruct the failed
processes. However, there is a gap of the research how these
could be integrated together to develop fault-tolerant
applications, and the range of issues that may arise in the
process are yet to be revealed.
My thesis is that with suitable infrastructural support an
integration of ULFM MPI and a modified form of the SGCT can be
used to create high performance robust PDE based applications.
The key contributions of my thesis are: (1) An evaluation of the
effectiveness of applying the modified version of the SGCT on
three existing and complex applications (including a general
advection solver) to make them highly fault-tolerant. (2) An
evaluation of the capabilities of ULFM MPI to recover from a
single or multiple real process/node failures for a range of
complex applications computed with the modified form of the SGCT.
(3) A detailed experimental evaluation of the fault-tolerant work
including the time and space requirements, and parallelization on
the non-SGCT dimensions. (4) An analysis of the result errors
with respect to the number of failures. (5) An analysis of the
ABFT and recovery overheads. (6) An in-depth comparison of the
fault-tolerant SGCT based ABFT with traditional checkpointing on
a non-fault-tolerant SGCT based application. (7) A detailed
evaluation of the infrastructural support in terms of load
balancing, pure- and hybrid-MPI, process layouts, processor
affinity, and so on.
Books on the topic "High Performance Plasma Coating process"
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Popov, Oleg A. High Density Plasma Sources: Design, Physics and Performance (Materials Science and Process Technology Series). William Andrew, 1996.
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Popov, Oleg A. High Density Plasma Sources: Design, Physics, and Performance (Materials Science and Process Technology Series). Noyes Publications, 1996.
Find full textBook chapters on the topic "High Performance Plasma Coating process"
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Jia, Yumei, Yongjin Feng, Jianli Zhang, Pingping Liu, Qian Zhan, and Farong Wan. "Synthesis of Beryllium Pebbles Using Plasma Rotating Electrode Process." In High Performance Structural Materials, 17–23. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0104-9_3.
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Shao, Gang, Hai Long Wang, Fang Shao, Kai Li, and Rui Zhang. "Properties of SiC/Fe Composites Prepared by Coating Process and Powder Metallurgy Method." In High-Performance Ceramics V, 852–54. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.852.
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Lee, Jae Seol, Hyeon Taek Son, and Toyohiko Yano. "Formation of ZrO2-Al2O3 Coating Layers on SiC Fiber by Dip-Coating Process." In High-Performance Ceramics V, 1386–88. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.1386.
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Bao, Wei Tao, Yin Zhu Jiang, Guang Yan Zhu, Jian Feng Gao, and Guang Yao Meng. "YSZ Thin Films Prepared by a Novel Powder Coating Process on Porous NiO-YSZ Cermet." In High-Performance Ceramics III, 435–38. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.435.
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Zhou, Feng, Ying Qing Fu, and Yang Gao. "Properties of Al2O3-TiO2 Coating Prepared by Plasma Spraying with an Internally-Fed Powder System." In High-Performance Ceramics V, 1274–76. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.1274.
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Zou, Liming, Xin Liu, Huanwen Xie, and Xinhua Mao. "High-Quality Ti–6Al–4V Alloy Powder Prepared by Plasma Rotating Electrode Process and Its Processibility in Hot Isostatic Pressing." In High Performance Structural Materials, 61–67. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0104-9_8.
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Mifune, Noriyuki, and Yoshio Harada. "2CaO･SiO2-CaO･ZrO2 Thermal Barrier Coating Formed by Plasma Spray Process." In High-Temperature Oxidation and Corrosion 2005, 239–46. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-409-x.239.
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Liang, Jinglong, Hui Li, Ramana G. Reddy, and Yungang Li. "Influence of Diluents Dosage on the Performance of High Solid Anti-corrosion Coating by Converter Dust." In Applications of Process Engineering Principles in Materials Processing, Energy and Environmental Technologies, 541–47. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51091-0_53.
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Rencheng, Xu. "HIGH EFFICIENCY PLASMA SPRAY PROCESS FOR ALUMINA COATING." In Advances in Thermal Spraying, 815–21. Elsevier, 1986. http://dx.doi.org/10.1016/b978-0-08-031878-3.50090-3.
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Shahien, Mohammed. "Reactive Plasma Spray." In Production, Properties, and Applications of High Temperature Coatings, 299–332. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-4194-3.ch012.
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Thermal spraying is a well-known coating technology with many variations in spraying techniques, feedstock materials and substrate materials. These unique variations increased its industrial applicability in different fields, including aerospace, automotive, chemical process, corrosion protection, and medical applications. However, one of the main limitations of thermal spray is the difficulty of depositing several nitride ceramics directly using conventional techniques. This is due to the decomposition of nitride particles under high temperature without a stable melting phase. This chapter presents reactive plasma spraying (RPS) technology as a promising solution for the in situ fabrication of several nitride ceramic coatings. The main attractive prospects of RPS for fabricating nitride coatings are specifically highlighted. Successful development of various high-temperature nitride coatings, such as AlN, Fe4N and Si3N4, are presented. Process optimization, the relationship between reaction and process parameters and the influence on coatings formation are comprehensively discussed.
Conference papers on the topic "High Performance Plasma Coating process"
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Moreau, Christian, and Luc Leblanc. "Optimization and Process Control for High Performance Thermal Spray Coatings." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2691.
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Abstract Thermal spray coatings are used to protect surfaces against exposure to severe conditions. To insure a reliable protection, not only the structure and properties of the sprayed coatings must be optimized but also one needs to develop appropriate process control techniques to produce high performance coatings in a consistent manner, day after day. This is particularly important during plasma spraying as the wear of the electrodes affects significantly the plasma characteristics and consequently the coating properties. First, in this paper, the stability of plasma spray processes is investigated by monitoring in-flight particle characteristics and plasma fluctuations. Secondly, the possibility and advantages of controlling plasma spray processes by monitoring and regulating the condition of the sprayed particles are discussed. Finally, we will see how the properties of thermal barrier coatings and wear resistant coatings can be optimized by controlling the temperature and velocity of the sprayed particles both in the plasma spray and HVOF (high velocity oxy-fuel) processes.
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McCullough, R., R. Molz, and D. Hawley. "Evaluation of Tungsten Carbide Coatings Sprayed with High Velocity Plasma Using a Process Map." In ITSC2007, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0776.
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Abstract Process mapping is an ideal method for tracking coating characteristics in the thermal spray process. With the increased utilization of in-flight particle diagnostic tools in recent years it is now possible to quickly and effectively characterize inflight powder particle properties. With industries' increasing understanding of the relationship of these properties and coating characteristics, it is now possible to rapidly understand the implications of in-process changes with respect to coating performance. This paper is an exploratory exercise that describes the utilization of process mapping of in-flight particle velocity and temperature characteristics to optimize tungsten carbide (WC) coatings sprayed with a High Velocity Plasma torch (HVP). Key performance factors of WC coatings include high inherent hardness, low porosity and neutral to compressive stress conditions. The combination of these factors all contribute to the coatings' overall success in it's intended application and elude to its toughness, wear resistance, corrosion resistance and general ability to protect the required components. Presently, the High Velocity Oxygen Fuel (HVOF) and High Velocity Liquid Fuel (HVLF) combustion processes are the favored method of applying dependable and commercially viable WC coatings that meet all of these criteria.
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Barbezat, G. "Low-Cost High-Performance Coatings Produced by Internal Plasma Spraying for the Production of High Efficiency Engines." In ITSC2003, edited by Basil R. Marple and Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p0139.
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Abstract For the deposition of functional coatings in cylinder bores of automotive engines different thermal spray processes are reviewed. Extensive studies of the process reliability have shown that the internal plasma spraying can be used in the industrial area of the automotive industry. Already today this technology is introduced in Europe and major Japanese companies are in an advanced status of evaluation. This paper describes the main processes used for these engine cylinder coatings and gives some results on typical coating characteristics and friction engine tests. It was shown in engine tests that the friction between piston ring and cylinder wall can be significantly reduced. Further the oil consumption can be significantly reduced and the wear resistance increased. The cost of the developed coating solution can be considered as low for this type of application.
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Kobayashi, Akira. "Performance of Thermal Barior Coatings Formed by Gas Tunnel Type Plasma Spraying." In ITSC2004, edited by Basil R. Marple and Christian Moreau. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.itsc2004p1092.
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Abstract Zirconia (ZrO2) coating formed by plasma spray method is widely used industrially as a thermal barrier coating (TBC). But it has still problems such as spallation and cracks inside the coating. The solution will be given by the development of new spaying processing. The zirconia-alumina (ZrO2-Al2O3) composite coating formed by gas tunnel type plasma spraying has a high hardness layer at the surface side of the coating, which shows the graded functionality of hardness, and is superior as a TBC. In this paper, the performance of such high hardness ZrO2- Al2O3 composite coating was investigated and the merit as TBC was clarified. The Vickers hardness of the high hardness layer near the coating surface increased by the thermal process of high energy plasma, which corresponded to the result that the coating became denser. Also, the effect of alumina mixing was discussed about the microstructure of this composite coating. The combination of high hardness of Al2O3 with the low thermal conductivity of ZrO2 resulted to the development of high performance TBC. The thermal conductivity of such ZrO2- Al2O3 composite coatings was proved to be much smaller than that in the longitudinal direction. Moreover the adhesive strength of such high hardness zirconia composite coatings was investigated as well as its mechanical properties. The adhesive strength of such high hardness coatings to the substrate was weakened as the increase in the coating thickness.
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Barbezat, G., J. Zierhut, and K. D. Landes. "Triplex - A High Performance Plasma Torch." In ITSC 1999, edited by E. Lugscheider and P. A. Kammer. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 1999. http://dx.doi.org/10.31399/asm.cp.itsc1999p0271.
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Abstract Plasma spraying is a well established process for producing ceramic and metallic coatings for many technical applications. The quality of the coatings and the efficiency of the process depend on the powder and on the operating parameters as well as on the plasma torch properties. Whereas many efforts have been made on creating novel powders and on optimizing the operational parameters, the principle, however, of DC plasma torches has remained unchanged for many years. This was the reason for developing a novel DC plasma torch system. This paper presents the construction and operating principle of this innovative torch system. Its high performance is demonstrated in selected ceramic coatings. Paper includes a German-language abstract.
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Jiang, X., J. Matejicek, A. Kulkarni, H. Herman, S. Sampath, D. L. Gilmore, and R. A. Neiser. "Process Maps for Plasma Spray Part II: Deposition and Properties." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0157.
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Abstract This is the second paper of a two part series based on an integrated study carried out at the State University of New York at Stony Brook and Sandia National Laboratories. The goal of the study is the fundamental understanding of the plasma-particle interaction, droplet/substrate interaction, deposit formation dynamics and microstructure development as well as the deposit properties. The outcome is science-based relationships, which can be used to link processing to performance. Molybdenum splats and coatings produced at three plasma conditions and three substrate temperatures were characterized. It was found that there is a strong mechanical /thermal interaction between droplet and substrate, which builds up the coating/substrate adhesion. Hardness, thermal conductivity increase, oxygen content and porosity decreases with increase of particle velocity. Increasing deposition temperature resulted in dramatic improvement in coating thermal conductivity and hardness as well as increase in coating oxygen content. Indentation reveals improved fracture resistance for the coatings prepared at higher deposition temperature. Residual stress was significantly affected by deposition temperature, although not to a great extent by particle conditions within the investigated parameter range. Coatings prepared at high deposition temperature with high-energy particles suffered considerably less damage in a wear test. The mechanism behind these changes is discussed within the context relational maps which is under development.
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Lima, C. R. C., J. Nin, and J. M. Guilemany. "Process Residual Stresses and High Temperature Oxidation Performance of Thermal Barrier Coatings." In ITSC2006, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, R. S. Lima, and J. Voyer. ASM International, 2006. http://dx.doi.org/10.31399/asm.cp.itsc2006p0513.
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Abstract Thermal barrier coatings (TBCs) allow increasing combustion temperatures of gas turbines and diesel engines thus improving the system performance. Residual stresses due to the differences of thermal expansion coefficient between metallic bond coat and ceramic top coat as well as the stresses due to the oxidation of the bond coat and the consequent increase in the thermally grown oxide (TGO) layer lead to ceramic debonding and subsequent failure of the thermal barrier system in service conditions. Extensive research has been carried out to minimize such events by applying multilayered coatings, intermediate diffusion or protective layers and other methods. In this work the TBC systems were obtained by applying distinct bond coats and top coats. The bond coats were applied by High Velocity Oxygen Fuel (HVOF) and the ceramic top coats were applied by Air Plasma Spraying (APS). Residual stresses were measured by the Modified Layer Removal Method (MLRM). Isothermal high temperature oxidation tests were performed and the results were correlated with the post spraying stress state and the coating thermal history. Results show that the residual stresses are mainly influenced by the thermal history regarding the quenching of individual splats and the plastic deformation of ceramic deposits.
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Puranen, Jouni, Jarmo Laakso, Leo Hyvärinen, Mikko Kylmälahti, and Petri Vuoristo. "High Temperature Oxidation Behaviour of MnCo2O4 Coating on Crofer 22 APU Manufactured by a Novel Solution Precursor Plasma Spray Process (SPPS)." In ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2012 6th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fuelcell2012-91385.
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MnCo2O4 spinel coatings are designed to be used on metallic interconnectors in SOFC devises to decrease oxidation rate of the metallic interconnect and to prevent the evaporation of harmful CrO3 and Cr2(OH)2 compounds. These Cr-compounds degrade the long-term performance of the SOFC by migrating to the triple phase barrier (TPB) of the cathode and reduce back to Cr2O3. MnCo2O4 spinel coatings, used in this study, were manufactured by using a novel solution precursor plasma spray (SPPS) process and heat treated in oxidizing environment. Deionized water based solutions of Mn(NO3)2•4H2O and Co(NO3)2•6H2O were used as a feedstock material. Concentration of the metal cations in the solutions was adjusted to 3 M. Ferritic stainless grade Crofer 22 APU with the thickness of 0.5 mm and surface roughness of Ra < 0.5 μm was used as a substrate material. The coatings were manufactured using a Sulzer Metco A3000S plasma spray system with F4-MB plasma gun with modified solution feeding hardware. Coatings with different microstructures were sprayed using different spraying parameters, e.g. the type of plasma gases used. The as-sprayed coatings were aged at 700 °C for 500 h in oxidizing environment, in order to study the stability of the coating, the growth of the Cr-scale and the Cr-transport through the spinel coatings. The microstructural characterization for the as-sprayed and the oxidized coatings were done using a field-emission scanning electron microscopy (FESEM) with SE-mode. The quantitative analyses were executed with energy dispersive spectroscopy (EDS), and in addition X-ray diffraction (XRD) was used for qualitative studies. The coatings with various microstructures were sprayed. The densest microstructure was sprayed using Ar-He plasma gas. Also the crystallographic equivalence for MnCo2O4 was achieved when Ar-He plasma was used with 40 mm spraying distance. Ageing caused the increase in structural porosity. On the interface between the coating and the interconnect, a dense spinel layer was formed which effectively prevented the Cr-transport forming approximately 500 nm thick Cr-rich sub-scale.
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Simard, S., and B. Arsenault. "Influence of Thermal Spray Process on the Corrosion Behavior of High-Density 316 Stainless Steel Coatings in Simulated Marine Environment." In ITSC2003, edited by Basil R. Marple and Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p0323.
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Abstract Under marine and coastal conditions, the degradation by corrosion of low-alloyed steels is generally observed. In order to overcome such important corrosion problems, the use of thermal spray coatings made of noble materials may be an attractive solution. 316 stainless steel thermal spray coating, an iron alloy coating, is often considered for corrosion protection because of its low material cost. Also, the high velocity oxy-fuel (HVOF) is often the selected coating process because it is known to provide coatings with a very low porosity level preventing the corrosive media to reach the substrate. The present paper compares the corrosion behavior of wrought 316 stainless steel with sprayed coatings made of the same alloy on 1020 mild steel. The corrosion behavior of materials is studied under salt fog conditions and with electrochemical techniques in brine simulating the marine environment. The coatings have been sprayed by HVOF under usual conditions. The results of this study demonstrate that the material behavior with regard to corrosion is process dependent . The HVOF sprayed stainless steel coating is much more sensitive to corrosion than wrought stainless steel. Corrosion product appearing on the samples is not only linked to the corrosion of the substrate by diffusion of the corrosive solution through pores but is also generated by intrinsic corrosion of coating itself. An enhanced sensitivity of the coating with regard to corrosion is attributed to the surface of particles or droplets, which are most likely degraded during the spraying process. However, thermal spray coatings having performances as good as wrought stainless steel can be obtained. In the present work, it is demonstrated that coatings obtained using vacuum plasma spray (VPS) have similar corrosion properties than wrought stainless steel in simulated marine environment. The industries considering corrosion protection of their components in marine environments by the use of stainless steel coatings must be aware of the reliability of their coatings. During the usual HVOF spray process, particles or droplets of stainless steel 316 are subject to important modification leading to a loss of performance against corrosion. Oxidation of alloying elements necessary to obtain a good stainless steel most likely occurs. However, the use of vacuum sprayed stainless steel coatings results to efficient protection against corrosion in marine environment.
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Ma, X. Q., T. D. Xiao, J. Roth, L. D. Xie, E. H. Jordan, N. P. Padture, M. Gell, X. Q. Chen, and J. R. Price. "Thick Thermal Barrier Coatings with Controlled Microstructures Using Solution Precursor Plasma Spray Process." In ITSC2004, edited by Basil R. Marple and Christian Moreau. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.itsc2004p1103.
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Abstract Thermal barrier coatings (TBCs) are capable of protecting hot-section engine components from the hot gas stream, and thereby can provide improvements in component durability and engine efficiency. Thick TBCs can provide further improvements in durability and efficiency, especially for static components. The main commercial coating methods for TBCs are electron beam physical vapor deposition (EB-PVD) and air plasma spray (APS). These processes have limitations for depositing thick TBCs: for EB-PVD, the deposition rates are low and the cost is high; for APS, durability is reduced with increased thickness. Inframat Corporation, in collaboration with the University of Connecticut, is developing a new plasma spray process, namely, solution precursor plasma spray (SPPS), for the formation of TBCs and also functional films from liquid precursor feedstock, instead of the solid powder feedstock used in conventional APS. SPPS TBCs have many unique microstructural features, including: ultra-fine splats, vertical micro- and macrocracks, micrometer- and nanometer-size porosity. These unique microstructural features provide a TBC with high thermal cycling spallation life and bond strength. These coatings have been made in thickness up to 2 mm and show excellent durability. In this paper we present microstructural characteristics and thermal cycling performance of SPPS-formed 7YSZ thick coatings varying in the range of 0.5-2 mm.