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1
Li, Chenchen, Xuefeng Yang, Shouren Wang, Yanjun Wang, Chongyang Lu i Jinlong Cao. "Study on Friction and Lubrication Characteristics of Surface with Unidirectional Convergence Texture". Coatings 9, nr 12 (21.11.2019): 780. http://dx.doi.org/10.3390/coatings9120780.
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In order to study the influence of texture on the wear and lubrication performance of the surface of the tools, three kinds of textures with unidirectional convergence morphology were processed on the surface of the samples, and each texture was designed with different area occupancy ratios. Simulation analysis shows that, owing to the reflow and convection effect of liquid in the texture, the lubricating film flowing through the textured surface has a high hydrodynamic pressure value, and the semicircular ring texture is the most prominent. By comparing the friction coefficient, when the area occupancy ratio of texture on the surface is 10%, the surface of the samples with different morphology has the lowest coefficient of friction; the friction coefficient of the semicircular ring textured surface is especially very low. Surface textures reduce the direct contact area between the friction pairs, and generate dynamic pressure lubrication and secondary lubrication, so that the surface friction coefficient of the samples is obviously reduced. The surfaces of the non-textured samples have abrasive wear and contact fatigue wear, and the surfaces of the textured samples have adhesive wear, abrasive wear, and cavitation.
2
Yang, Fuqin, Dexing Hu, Qianhao Xiao i Shun Zhao. "Experimental study on line-contact elastohydrodynamic grease lubrication properties of surface-textured rollers". Industrial Lubrication and Tribology 73, nr 3 (25.01.2021): 477–84. http://dx.doi.org/10.1108/ilt-03-2020-0079.
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Purpose This paper aims to study line-contact elastohydrodynamic grease lubrication properties of surface-textured rollers as well as the effect of different crown widths (dw) on oil film thickness under textured conditions. Design/methodology/approach The laser processing method was used to make the micro-texture on the surface of GCr15 steel rollers; lithium grease was used as the lubricant, and line-contact elastohydrodynamic grease lubrication experiments under pure sliding conditions were performed on light interference elastohydrodynamic-lubricated experimental table. Findings The results show that the line-contact elastohydrodynamic grease lubrication is closely related to the textured crown width of steel rollers. At low speeds and light loads, texturing has an inevitable inhibitory effect on the formation of the lubricating oil film, and the smaller the width of the crown area, the more obvious the inhibitory effect, which is not conducive to the improvement of the lubrication condition. At high speeds and high loads, the textured roller with dw = 1 mm has the largest oil film thickness and shows better lubrication performance. Originality/value At present, there is little research on the surface texture of line-contact friction pairs. This work explores the effect of different textured crown width on the lubricating properties of line-contact elastohydrodynamic grease lubrication by experiment. It provides a new theoretical basis for the subsequent practical application of surface texture technology.
3
Bhardwaj, Vivek, R. K. Pandey i V. K. Agarwal. "Performance studies of textured race ball bearing". Industrial Lubrication and Tribology 71, nr 9 (4.11.2019): 1116–23. http://dx.doi.org/10.1108/ilt-12-2018-0445.
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Purpose The purpose of this paper is to develop an energy-efficient and dynamically improved thrust ball bearing using textured race. A texture has been used on the stationary race of the test bearing to conduct the long-duration experiment for exploring its tribological and vibrational behaviours under starved lubricating condition using micro size MoS2 blended grease. The performance behaviours of the textured race bearing have been compared with conventional bearing (i.e. having both races without textures) under the identical operating conditions for demonstrating the advantages of textured race. Design/methodology/approach Texture was created on stationary race of the test ball bearing (51308) using nano-second pulsed Nd: YAG laser. Performance parameters (frictional torque, temperature rise and vibrations) of textured ball bearings were measured under severe starved lubricating conditions for understanding the critical role of texture in the long duration of the test. S-type load cell and miniature accelerometer were used for measuring the frictional torque and vibration, respectively. Bulk temperature at stationary races (at the back side) of test bearings was measured in operating conditions using a non-contact infrared thermometer. Findings Significant reduction in frictional torque and decrease in amplitude of vibration with textured ball bearing were found even under the severe starved lubricating condition in comparison to conventional bearing. Originality/value There is dearth of research pertaining to the performance behaviours of ball bearings using textures on the races. Therefore, an attempt has been made in this study to explore the tribo-dynamic performance behaviours of a thrust ball bearing using a texture on its stationary race under severe starved lubricating condition for the longer duration of the test.
4
Ma, Zhen, Junjie Song, Hengzhong Fan, Tianchang Hu i Litian Hu. "Preparation and Study on Fretting Tribological Behavior of Composite Lubrication Structure on the Titanium Alloy Surface". Coatings 12, nr 3 (3.03.2022): 332. http://dx.doi.org/10.3390/coatings12030332.
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As an excellent light metal material, titanium alloy has an important application in high technology equipment. In this study, the composite lubrication structure was prepared on the titanium alloy surface by combining the surface texture, thermal oxidation layer, and polytetrafluoroethylene (PTFE)-based lubricating coating. The effect of texture parameters and thermal oxidation layer on the fretting wear behavior of the composite lubrication structure was evaluated under a load of 50 N. The results showed that the PTFE-based lubricating coating on the textured surface showed excellent friction-reduction and anti-wear effect compared with the coating on the single smooth surface and thermal oxidation surface. The introduction of a thermal oxidation layer on the textured surface further improved the fretting wear life of lubrication coating. The friction coefficient and wear rate can be as low as 0.242 and 2.3 × 10−5 mm3·N−1m−1, respectively, under dry fretting contact conditions. Compared with the untextured surface, the longevity of the composite lubrication structure is extended by more than 90%.
5
Jiang, Jie, Dang Sheng Xiong, Jian Liang Li i Yan Shi. "Tribological Properties of Laser Surface Texturing and Coating Duplex-Treated Surface". Materials Science Forum 686 (czerwiec 2011): 706–10. http://dx.doi.org/10.4028/www.scientific.net/msf.686.706.
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Components of space machines often works at high temperature and vacuum, or on other rigour conditions, the traditional liquid lubricant cannot satisfy the requirement. The common solid lubricant is hard to supply between two friction surfaces continuously and it is easily decomposed and failure at high temperature. It is an urgent need to study a new type of lubrication technology. In this paper, the surface of 1Cr18Ni9Ti with high hardness and micro dimples was prepared through laser texturing and plasma molybdenizing/plasma nitriding duplex treatment. The textured surface was coated with MoS2 lubricating film and the friction and wear properties from room temperature to high temperature were evaluated. The results show that the laser surface textured dimples trap hard abrasive particles and reduce the damage to the lubricating film, and thus decrease the wear rate. The optimum dimple density of 7.1% is obtained. At elevated temperature, the wear rate of molybdenized texture or nitrided texture is lower than that of the matrix and single textured surface.
6
Hua, Xijun, Xuan Xie, Bifeng Yin, Peiyun Zhang, Jinghu Ji, Hao Wang i Yonghong Fu. "Tribological performance and self-lubricating mechanism of the laser-textured surface filled with solid lubricant in rolling friction pair". Industrial Lubrication and Tribology 70, nr 2 (12.03.2018): 371–84. http://dx.doi.org/10.1108/ilt-07-2017-0210.
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Purpose This paper aims to find out the tribological performance and self-lubricating mechanism of the laser-textured surface filled with solid lubricant in rolling friction pair. Design/methodology/approach The textures on the surfaces of GCr15 bearing steel were produced by acousto-optic Q diode-pumped yttrium aluminum garnet laser with the technology of “single pulse one time, repeating at intervals” and filled with composite solid lubricant. The tribology tests were conducted on the MMW-1A universal friction and wear testing machine. Findings It was found that the solid-lubricated micro-textured surface can reduce the friction coefficient effectively. The MoS2/PI composite solid lubricant works better than the single MoS2 solid lubricant, and the ratio of PI/MoS2 + PI at 20 per cent is the best recipe. The friction coefficient of the sample surfaces decreases first and then increases with the increase in texture densities, and a texture density of 19.6 per cent has the best effect on friction reduction. The friction coefficient of the textured surfaces gradually decreases with the increase in both rational speed and load. For the same texture density, the friction coefficient of textured surfaces decreases slightly with the increase in diameter. Furthermore, the mechanism of “rolling-extrusion-accumulation” occurred on the textured surface can collect the solid lubricant, thereby, improve the effect of lubricating and anti-friction. Originality/value The results of the experimental studies demonstrated the application prospect of laser surfaces texturing combined with solid lubricant in rolling friction pair.
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Qiang, Haowen, Guangming Gao, Sitong Ye, Linkai Cheng i Quandai Wang. "Effect of Characteristic Parameters and Distribution of Friction Pair Surface Texture on Lubrication Properties". Lubricants 11, nr 3 (14.03.2023): 139. http://dx.doi.org/10.3390/lubricants11030139.
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Based on the basic mechanism and bionics principle that texture affects the dynamic pressure effect of lubricating medium, a V-shaped texture that converges along the sliding direction is designed. Through numerical simulation, the optimal geometric parameters and distribution of the V-shaped and textures are obtained. A textured surface with various texture features is prepared using a nanosecond ultraviolet laser with bearing steel as substrate. Tribological experiments with friction and wear tester are performed to investigate the effect of characteristic parameters and distribution of surface texture on the lubrication performance and the lubrication properties are compared and analyzed with that of circular texture. Hence, this investigation provides a research direction to improve the lubrication performance between frictional pairs under fluid lubrication condition to reduce the frictional wear of mechanical systems. The results show that under the conditions of optimal parameters, due to the effect of convergence and extrusion on the flow of lubrication medium, the V-shape texture is better than the circular texture in improving the lubrication performance. The optimal characteristic parameters of V-shape texture are: 60° for the angle between the two wings, 0.53 for shape parameter, 25.9% for area ratio, 13 μm depth, 60% texture area coverage ratio, and the inlet of flow field of the texture distribution position.
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Zhang, Yu, Guoding Chen i Lin Wang. "Effects of thermal and elastic deformations on lubricating properties of the textured journal bearing". Advances in Mechanical Engineering 11, nr 10 (październik 2019): 168781401988379. http://dx.doi.org/10.1177/1687814019883790.
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Hydrodynamic journal bearing is an important part of rotary machine and faces many challenges such as high rotating speed, heavy specific pressure, and large temperature rise with the development of industry. These challenges lead to notable thermal and elastic deformations of the journal bearing. Surface texture has been proved to be a valid method to promote bearing lubricating properties. However, effects of thermal and elastic deformations on lubricating properties of the textured journal bearing have not been clearly analyzed. Based on this, the article presents a method to transform thermal–structural–fluid interaction into thermal–structural interaction and thermal–fluid interaction based on textured journal bearing model. Cavitation and temperature-viscosity effects are also considered. Based on this method, action mechanisms of surface texture on lubricating properties are discussed considering elastic and thermal deformations, and effects of elastic and thermal deformations on the textured journal bearing are also investigated. The results show that the load carrying capacity and the maximum oil film pressure of the textured journal bearing both increase when elastic and thermal deformations are considered. Optimal texture parameters can enhance the backflow effect in dimples and restraint cavitation phenomenon in the oil film rupture region. Meanwhile, inertial and cavitation effects caused by surface texture have significant effects on elastic and thermal deformations of the journal bearing.
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Wang, Hao, Xuan Xie, Xijun Hua, Bifeng Yin, Hang Du, Sheng Xu i Bai Jing Qiu. "The effect of laser surface texturing to inhibit stick-slip phenomenon in sliding contact". Advances in Mechanical Engineering 11, nr 9 (wrzesień 2019): 168781401987463. http://dx.doi.org/10.1177/1687814019874635.
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Stick-slip phenomenon in some mechanical structures, especially in machine tools, should be eliminated or inhibited, otherwise the vibration will occur and the position error will inevitably be obtained. In this study, different kinds of surface textures were carried out on the lower samples of the pin-on-disk contact. The starting process of the machine tools was simulated on an Rtec-Multi-Function Tribometer. The stick-slip phenomenon was observed in each kind of samples. However, the stick-slip phenomenon of smooth sample is larger than that of the textured samples. The bulge-textured surface shows excellent anti-stick-slip effect, and the critical stick-slip speed of bulge-textured surface is 95.9% lower than that of the smooth surface. Simultaneously, the anti-stick-slip effect of bulge-textured surface is superior to that of the dent-shaped texturing surface. What’s more, when the amount of lubricating oil is 15 mL, the standard deviation values of friction coefficient and critical speed of stick-slip phenomena (rotational speed when the standard deviation of friction coefficient is abrupt) are the lowest at different rotational speeds. It can be predicted that the bulge textures and adequate amount of lubricating oil (15 mL) can eliminate stick-slip phenomenon when processed in the surface of the machine tool because the bulge textures and adequate amount of lubricating oil can improve frictional state effectively and avoid the slip of the contact surface.
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Tang, Jie, Jie Zeng i Xin Lu. "Experimental Study on Texture Coupling Mechanism and Antifriction Performance of Piston Rod Seal Pair". Micromachines 13, nr 5 (30.04.2022): 722. http://dx.doi.org/10.3390/mi13050722.
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The effect of the coupling texture on the friction and wear of a piston rod-rubber seal pair under lubricating conditions is studied in this paper. Crescentiform textures with different area densities were fabricated on high carbon chromium bearing steel (GCr15) and ethylene propylene diene monomer (EPDM) materials by using a laser marking machine. We compare and analyze the effects of untextured, single-textured, and coupling-textured surfaces on the friction characteristics of the piston rod-rubber seal pair by conducting tests on the reciprocating module of the UMT-2 friction and wear testing machine. The results showed that the coupling-textured surface had the lowest coefficient of friction and wear compared to the untextured and single-textured surfaces. When the normal load was 10 N under the optimal coupling texture area density (6.4%), the friction and wear of the sealing pair decreased the most. Compared with the untextured surface, the friction coefficient was reduced by 27.9% and the wear amount was reduced by 30.0%; compared with the single-textured surface, the friction coefficient was reduced by 18.9%, and the wear amount was reduced by 23.8%. The coupling effect generated by the coupling texture effectively enhanced the formation and stabilization of the oil lubricant film and effectively captured wear debris, preventing it from continuously scratching the surface and reducing wear and roughness.
11
Mao, Yang, i Zhongwei Yin. "Modeling and experiments of cavitation on a pocket-textured surface". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, nr 1 (8.06.2019): 94–103. http://dx.doi.org/10.1177/1350650119855903.
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A two-dimensional computational fluid dynamics model was developed and an experiment was performed to investigate the role of pocket texture on fully lubricated motion with the cavitation effect. This paper discusses the cavitated simulation models and experiments to describe texture cavitation to solve the lubricating properties of the textured friction pair. The effects of velocity and texture scale on the support force and friction coefficient are discussed. It was found that the results of the two-dimensional computational fluid dynamics model with cavitation are nearly consistent with the experimental results; the hydrodynamic pressure decreased and the sliding speed dropped, and the effect of pressure became highly pronounced with ideal texture size. In addition, the simulation solution can show the internal flow field, and extend the solutions to large-scale textures and multiple textures. Meanwhile, appropriate texture parameters can optimize the friction coefficient and support force. The texture depth ratio plays a more important role on the value of the support force, and the width ratio has a greater influence on the friction coefficient.
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Manser, Belkacem, Idir Belaidi, Sofiane Khelladi, Mohamed A. Ait Chikh, Michael Deligant i Farid Bakir. "Computational investigation on the performance of hydrodynamic micro-textured journal bearing lubricated with micropolar fluid using mass-conserving numerical approach". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, nr 8 (15.12.2019): 1310–31. http://dx.doi.org/10.1177/1350650119894167.
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The tribological characteristic of journal bearing systems can be enhanced with the integrating of textures in the contact interfaces, or using the lubricating effect of non-Newtonian fluids. In this study, the combined effects of bearing surface texturing and non-Newtonian lubricants behavior, using micropolar fluid model, on static characteristics of hydrodynamic circular journal bearings of finite length are highlighted. The modified Reynolds equation of micropolar lubrication theory is solved using finite differences scheme and Elrod's mass conservation algorithm, taking into account the presence of the cylindrical texture shape on full and optimum bearing surfaces. The optimization textured area is carried out through particle swarm optimization algorithm, in order to increase the load lifting capacity. Preliminary results are in good agreement with the reference ones, and present an enhancement in the performances of micro-textured journal bearings (load carrying capacity and friction). The results suggest that texturing the bearing convergent zone significantly increases the load carrying capacity and reduce friction coefficient, while fully texturing causes bad performances. It is also shown that the micropolar fluids exhibit better performances for smooth journal bearings than a Newtonian fluid depending on the size of material characteristic length and the coupling number. The combined effects of fully surface textured with micropolar fluids reduce the performance of journal bearing, especially at lower eccentricity ratios. Considering the optimal arrangement of textures on the contact surface, a significant improvement in terms of load capacity and friction can be achieved, particularly at high eccentricity ratios, high material characteristic lengths and high values of the coupling numbers of micropolar fluids.
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Lertphokanont, Vitchuda, Takayuki Sato, Masahiro Oi, Minoru Ota, Keishi Yamaguchi i Kai Egashira. "Friction Characteristics with Pin-on-Disc Friction Test on Microstructured Surface Using Whirling Electrical Discharge Texturing". Advanced Materials Research 1017 (wrzesień 2014): 417–22. http://dx.doi.org/10.4028/www.scientific.net/amr.1017.417.
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A microstructured surface was created on a steel surface by whirling electrical discharge texturing (WEDT) since it was considered that the microstructures could act as lubricant reservoirs to assist the formation of a lubricating film, resulting in reduced friction. In this study, friction tests under engine oil were carried out over a range of loads and sliding speeds. In addition, the surface characteristics of the microstructured surface were also investigated to optimize the friction characteristics of the textured surface through pin-on-disc friction tests. It was found that under the mixed lubrication condition near the boundary condition, textured surfaces with texture-area ratio of approximately 6% and a mean crater diameter of 35 μm were considered as the optimal conditions for reducing the friction coefficient. However, a texture-area ratio of approximately 4% and a mean crater diameter of 35 μm were considered as the optimal conditions for reducing the friction coefficient under the mixed lubrication condition near the elastohydrodynamic lubrication condition. It was considered that when the normal load decreased, the lubrication region changed from the mixed lubrication condition to the hydrodynamic lubrication condition, which meant that the actual contact surface area decreased. The decrease in the actual contact surface area with decreasing texture-area ratio led to a reduction in the friction coefficient. Finally, it was clarified that the friction coefficient was reduced under the optimized conditions of the microstructured surface through a pin-on-disc friction test.
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Wang, Chao, Juan Chen i Liangcai Zeng. "Wear and Lubrication Performance of Different Reticular-Textured TiN-Coated Surfaces under Lubricated Conditions". Processes 10, nr 12 (6.12.2022): 2605. http://dx.doi.org/10.3390/pr10122605.
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Texture and coating technology can significantly improve the tribological properties of mechanical components. In this study, the lubricating and wear properties of the reticular surface texture under the action of TiN were studied. Lubrication and wear experiments at different speeds were conducted using a UMT-3 wear and friction testing machine. Using Fluent fluid simulation, the bearing capacity of the oil film was obtained, and the lubrication performance of the texture was verified. The results showed that the simulation experiment and the lubrication experiment were consistent to a certain extent. For the groove width and angle parameters studied in this paper, optimal parameters existed to achieve the maximum bearing capacity, 1.27 N. Due to the high hardness and low elastic modulus of the TiN coating, the coated reticular texture was more wear-resistant, and it achieved the minimum wear volume 1.148 × 10−6 mm3 from the grinding stainless-steel matrix. The effect of the fluid dynamic pressure, wear debris collection, and lubricating oil storage were the main reasons for the increase in load-carrying capacity and the decrease in wear with the coated reticular texture.
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Wang, Cheng, Jianlin Cai, Gong Cheng, Jiaxu Wang i Dongxing Tang. "Numerical Investigations of Tribological Characteristics of Biomimetic-Textured Surfaces". Sustainability 15, nr 17 (30.08.2023): 13054. http://dx.doi.org/10.3390/su151713054.
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Rail transportation has dramatically improved travel convenience, but it has also led to environmental pollution and energy consumption issues. These challenges can be partially addressed by reducing friction loss in the mechanical transmission of rail systems. This paper examines the tribological properties of bionic-textured surfaces inspired by snake- and sharkskin. This study focuses on generating bionic textured surfaces with randomly distributed peaks through numerical simulation and connecting them to a transient Reynolds equation and friction fatigue model. The bionic surface wear lubrication model considers the lubricating film’s thickness and contact pressure obtained from the GT model. The results reveal that the existence of a bionic texture can reduce the friction coefficient and wear amount on the contact surface. The findings of this study not only offer a potential solution for reducing energy consumption and emissions in intelligent rail transit systems but also hold promise for providing further insights into the numerical simulation of bionic weaving and the investigation of tribological characteristics.
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Wu, Ze, Youqiang Xing i Jiansong Chen. "Improving the Performance of Micro-Textured Cutting Tools in Dry Milling of Ti-6Al-4V Alloys". Micromachines 12, nr 8 (11.08.2021): 945. http://dx.doi.org/10.3390/mi12080945.
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Micro-textured tools were fabricated by making textures on rake faces and filling them with molybdenum disulfide. Dry milling of Ti-6Al-4V alloys was carried out with the micro-textured tools and conventional tools for comparison. Results showed that micro-textured tools can reduce the resultant cutting forces, cutting temperatures, and power consumption by approximately 15%, 10%, and 5%, respectively. Meanwhile, the developed tools can improve tool lives by approximately 20–25%. The radial width of cut, the cutting speed, and the axial depth of cut all had statistical and physical effects on the energy consumption per unit of volume in dry milling of Ti-6Al-4V alloys, while the feed per tooth seemed to have no significant effect. The mechanism for improved performance of micro-textured tools can be mainly interpreted as their self-lubricating function.
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Zhao, Yun Cai, Gao Jie Hao, Xiao Mei Liu, Chun Ming Deng i Wen You Ma. "The Influence of Rhombus Cross Track Laser Remelting on Tribological Properties of Lubricating Wear-Resisting Coating Prepared Plasma Spraying". Applied Mechanics and Materials 121-126 (październik 2011): 1830–35. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.1830.
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This paper is about the KF301/WS2 lubricating wear-resisting coating of diamond textured surface modification which is prepared by supersonic plasma spraying, laser remelting coating and surface micro moulding, and coating’s tribological characteristic is studied under room temperature. It indicates that the diamond texture has a certain influence on abrasion loss and friction factor of coating’s surface. In the initial stages, fiction coefficient of untextured surface is about 0.0138, while fiction coefficient of textured surface is about 0.0115, compared with the former, the latter is obviously better and decreases 17%; When wear time reaches to 1 hour, abrasion loss of untextured surface is 0.03mg, and which of diamond textured surface is about 0.018, compared with the former, the latter is obviously better and decreases 40%. Tribological characteristic of diamond textured surface is higher than untextured surface.
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Shen, Ming-xue, Zhao-xiang Zhang, Jin-tao Yang i Guang-yao Xiong. "Wetting Behavior and Tribological Properties of Polymer Brushes on Laser-Textured Surface". Polymers 11, nr 6 (4.06.2019): 981. http://dx.doi.org/10.3390/polym11060981.
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Polymer brush layers can act as effective lubricants owing to their low friction and good controllability. However, their application to the field of tribology is limited by their poor wear resistance. This study proposes a strategy combining grafting and surface texturing to extend the service life of polymer brushes. Surface microstructure and chemical composition were measured through scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). Water contact angles were measured to evaluate the surface wettability of the grafted silicon-based surface texture. Results showed the distinct synergistic effect between polymer brushes and laser surface texturing (LST). The prepared polymer brushes on textured surface can be a powerful mechanism for friction reduction properties, which benefit from their strong hydration effect on the lubrication liquid and promote the formation of a local lubricating film. Moreover, the wear life of polymer brushes can be immensely extended, as micro-dimples on the textured surface can effectively protect the polymer brushes. This study presents a method to enhance the load-bearing capacity and wear resistance of the grafted surface of polymer brushes.
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Khaskhoussi, Amani, Giacomo Risitano, Luigi Calabrese i Danilo D’Andrea. "Investigation of the Wettability Properties of Different Textured Lead/Lead-Free Bronze Coatings". Lubricants 10, nr 5 (3.05.2022): 82. http://dx.doi.org/10.3390/lubricants10050082.
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Hydraulic components are often subjected to sliding contacts under starved or mixed lubrication. The condition of starved lubrication occurs during the start-up phase of the hydraulic machines or at low working temperature, causing friction and wear of components such as the cylinder block or the valve plate. The aim of this paper was to evaluate the hydrophobicity and oleophilic behavior of lead/lead-free bronze coatings under different texture conditions obtained by varying the diameter and the density of the dimples. The wettability tests were performed using sessile drop tests with oil and water liquids. The dimple parameters were analyzed using confocal microscopy, while the XRF analyses were performed to evaluate the composition of the bronze coatings. Based on the wettability measurements using oil and water, it was possible to assess that the porous surface acted as oil reservoirs that could prolong the life of lubricating oil layer, and may have resulted in a superior wear resistance. Furthermore, a relevant hydrophobicity was highlighted, suggesting that the surface texturing promoted the water-repellent barrier action on the surface. The experimental results showed that the discrepancy in surface properties in oil and water was raised when using the lead bronze coating. These coupled oleophilic and hydrophobic behaviors could play a beneficial role in sustaining the durability of a lubricating oil layer under a condition of continuous water-droplet impact.
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Sharma, Varun, i Pulak M. Pandey. "Mechanistic Based Cutting Force Model During Ultrasonic Assisted Turning with Self-Lubricating Cutting Inserts". Journal of Advanced Manufacturing Systems 18, nr 01 (13.02.2019): 133–55. http://dx.doi.org/10.1142/s0219686719500070.
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The present research paper presents a mechanistic model for determining the cutting forces during Ultrasonic Assisted Turning (UAT) process using self-lubricating textured cutting inserts. In order to understand the mechanics of the process, forces on chip have been analyzed by using free body diagram. The force and momentum equilibrium on chip have been used to define the governing force equations. The effect of ultrasonic vibrations has been considered by taking the average force of cutting over a complete cycle of vibration. The self-lubricating cutting insert has been modeled to study the effect of intermittent cutting and thin lubricating layer formation at tool-chip interface. The validation of the developed model has been done by performing UAT experiments with self-lubricating textured cutting inserts. It is observed that percentage error of prediction by mechanistic model in determining main and radial components of cutting forces is of the order of 6.73% and 14.67%, respectively with respect to the experimental values.
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Huo, Wen Guo, Qing Song Tian, Juan Shao i Hou Jun Qi. "Finite Analysis of Cutting Temperature with Internal Lubricating Tool". Materials Science Forum 770 (październik 2013): 25–28. http://dx.doi.org/10.4028/www.scientific.net/msf.770.25.
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The objective of this work is to model the cutting temperature generated during dry turning with micro-graphite internal lubricating tool. Dry cutting FEM were carried out with these micro-graphite internal lubricating tool and conventional YG8 tool based ABAQUS. The machining performance was assessed in terms of the cutting temperature. Results show that the cutting temperature with the micro-graphite internal lubricating textured tools was reduced compared to the conventional tool.
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Zhang, Yali, Xiaogang Zhang, Tonghai Wu i You-bai Xie. "Effects of surface texturing on the tribological behavior of piston rings under lubricated conditions". Industrial Lubrication and Tribology 68, nr 2 (14.03.2016): 158–69. http://dx.doi.org/10.1108/ilt-05-2015-0063.
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Purpose – The piston ring-cylinder liner pair is one of the most important tribological systems of an internal combustion engine. The friction loss of the piston ring-cylinder liner pair accounts for the largest portion of total efficiency losses. Therefore, improving the tribological system design of the piston ring-cylinder liner pair can reduce friction losses and bring tremendous economic benefits to society. This paper aims use surface texturing, which is proving to be an effective method, for improving the tribological performance of sliding surfaces. Design/methodology/approach – In this paper, an experimental study using a pin-on-disk tribometer was carried out to evaluate the effects of surface texturing on friction reduction of piston rings under various loads and sliding velocities. Rectangular- and circular-shaped textures with different depths and area densities were produced by a Femtosecond laser. Comparison experiments were conducted with un-textured rings. Findings – The results indicate that the friction performance of the ring surface was significantly improved by surface texturing, and the running-in stage was also shortened. More specifically, it was found that the rectangular-shaped texture had a better effect on friction reduction than the circular-shaped texture. Results also indicate that an optimum texture density existed for the rectangular-shaped texture. Additionally, it was observed that the average friction coefficient reduction of the textured ring decreased with increasing load and increased with increasing sliding velocity. Originality/value – Consequently, these findings provide a more in-depth understanding of the relationship between micro-textures and tribological properties of piston rings in lubricating sliding.
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Wu, Xinmeng, Yaohong Jiang, Tianhao Wu, Bin Zuo, Shunuo Bian, Kun Lu, Lijun Zhao, Lihua Yu i Junhua Xu. "Insight into the Mechanisms of Nitride Films with Excellent Hardness and Lubricating Performance: A Review". Nanomaterials 13, nr 15 (29.07.2023): 2205. http://dx.doi.org/10.3390/nano13152205.
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Transition metal nitride (TMN) films with excellent hardness and lubricating performance are versatile low dimension materials, which are widely used in various fields including industries, transportation, aerospace, and so on. This paper introduces one film design strategy and provides a review of the mechanisms for strengthening and lubricating nitride films. The design strategy refers to two aspects which determine the structures, the performance, the components, and the chemical constitutions of nitride films The strengthening mechanisms of nitride films are then illuminated in detail, including the solid solution effect, the grain size effect, the secondary phase effect, the stress or stress field effect, the template effect, and the valence electron concentration effect. Five lubricating mechanisms are next summarized, including the easy-shear nature, the tribo-chemical reactions, the lubricious fluorides, the textured contact surface, and the synergistic effect. This paper aims to give a comprehensive introduction for understanding the mechanisms of strengthening and lubrication of nitride films for students and researchers, as well as to understand the current research progress in nitride films for exploring research gaps.
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Deng, Jian Xin, Ze Wu i Yun Song Lian. "Design, Fabrication and Properties of Textured Self-Lubricated Tools in Dry Cutting". Materials Science Forum 773-774 (listopad 2013): 414–19. http://dx.doi.org/10.4028/www.scientific.net/msf.773-774.414.
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Textured self-lubricated tools were designed and fabricated. Dry cutting tests were carried out on with these self-lubricated tools and a conventional tool. The tool wear and the friction coefficient at the tool chip interface were measured. It was shown that the tool wear and the friction coefficient of the textured self-lubricated tools were reduced compared with that of the conventional tool. Two mechanisms responsible were found, the first one is explained as the formation of a lubricating film with low shear strength at the tool-chip interface, which was released from the texturing and smeared on the rake face, and served as lubricating additive during dry cutting; the other one was explained by the reduced contact length at the tool-chip interface of the textured tools, which contributes to the decrease of the direct contact area between the chip and rake face. It is suggested that the using of textured self-lubricated tools is an effective way to reduce the tool wear in dry cutting.
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WU, Ze, You Qiang Xing i Peng Huang. "Cutting Performance of Fiber Laser Textured Tools in Face Milling of Titanium Alloys". Advanced Materials Research 1142 (styczeń 2017): 250–53. http://dx.doi.org/10.4028/www.scientific.net/amr.1142.250.
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Textured self-lubricating tools were fabricated by fiber laser machining. Dry milling of titanium alloys was carried out with these textured tools and conventional one for comparison. The cutting forces, cutting temperature, surface roughness of processed workpiece and tool flank wear were measured. Results show that the textured tools can reduce the cutting forces, cutting temperature and surface roughness of workpiece, as a result, present superior wear-resistance compared to the untextured tool.
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Liu, Xianfu, Jianhua Zhang i Li Li. "Surface Integrity and Friction Performance of Brass H62 Textured by One-Dimensional Ultrasonic Vibration-Assisted Turning". Micromachines 12, nr 11 (14.11.2021): 1398. http://dx.doi.org/10.3390/mi12111398.
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The processing method, one-dimensional ultrasonic vibration-assisted turning (1D UVAT), is a potential and efficient way for fabricating a micro-textured surface. This paper aims at exploring the surface integrity and friction performance of brass H62 textured by the 1D UVAT. Four micro-textured surfaces with a specific distribution, size, and shape of dimples were fabricated by optimizing processing parameters, and the corresponding surface topography, subsurface microstructure, and surface roughness were observed and analyzed. A series of friction tests were carried out under oil-lubricating conditions to research the friction performance of micro-textured surfaces. The results show that the reason for the deviation between theoretical and experimental values of dimple depth was further revealed by observing the corresponding subsurface microstructure. The surface roughness of the micro-textured surfaces prepared is related to the number of micro-dimples per unit area and dimple size, which is greater than the surface generated by conventional turning. Compared with the polished surface and micro-grooved surface, the micro-textured surfaces have better friction performance with a lower frictional coefficient (COF) and wear degree. For the micro-textured surface fabricated by 1D UVAT, the number of micro-dimples per unit area has a great effect on the friction performance, and choosing a larger number is more conducive to improving the friction performance under the oil-lubricating condition. Consequently, this study proves that the proposed 1D UVAT can be a feasible candidate for preparing a micro-textured surface with better tribological property
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Singh, R. C., R. K. Pandey, Rooplal, M. S. Ranganath i S. Maji. "Tribological performance analysis of textured steel surfaces under lubricating conditions". Surface Topography: Metrology and Properties 4, nr 3 (29.07.2016): 034005. http://dx.doi.org/10.1088/2051-672x/4/3/034005.
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Mi, Pengbo, i Fuxing Ye. "Wear performance of the WC/Cu self-lubricating textured coating". Vacuum 157 (listopad 2018): 17–20. http://dx.doi.org/10.1016/j.vacuum.2018.08.029.
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Yang, Fuqin, Q. H. Xiao i Chunhui Geng. "Effect of surface micro-groove texture on lubrication performance of tripod universal coupling". Industrial Lubrication and Tribology 73, nr 10 (13.10.2021): 1237–47. http://dx.doi.org/10.1108/ilt-06-2021-0198.
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Purpose This study aims to study the effect of micro-groove texture geometric parameters on the lubrication characteristics of the tripod universal coupling. Design/methodology/approach The Navier–Stokes equation was used to analyse the influence of micro-groove geometric parameters on the coupling’s lubrication performance. Further, Kriging approximate model and neighborhood cultivation genetic algorithm (NCGA) were used to optimise the micro-groove geometric parameters and improve the coupling’s lubrication performance. Findings The results show that as the micro-groove depth and width increase, respectively, the oil film-bearing capacity first increases and then decreases; on the contrary, the friction coefficient first decreases and then increases. With the increase of the micro-groove inclination angle, the bearing capacity of the oil film first increases and then remains unchanged. At the same time, the friction coefficient first decreases and then increases slightly. The lubricating performance of the optimised coupling is significantly improved: the optimised oil film-bearing capacity increases by 12.5%, the friction coefficient reduces by 14% and the maximum oil film pressure increases by 4.3%. Originality/value At present, the grease lubrication performance of the micro-groove textured tripod universal coupling has not been studied. The micro-groove parameters are optimised, and the coupling’s lubrication performance is improved greatly by the Kriging model and NCGA algorithm. It is of great significance to extend the coupling’s fatigue life.
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Sharma, Varun, i Pulak M. Pandey. "Experimental investigations and statistical modeling of surface roughness during ultrasonic-assisted turning with self-lubricating cutting inserts". Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 232, nr 6 (26.10.2017): 709–22. http://dx.doi.org/10.1177/0954408917738127.
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The present paper describes the effect of cutting and vibration parameters on the surface roughness of specimen machined by ultrasonic-assisted turning with self-lubricating cutting inserts. The selected process has been based on comparative analysis between conventional turning and ultrasonic-assisted turning using plane and textured cutting inserts. An improvement of the order of 35.89% is observed during ultrasonic-assisted turning with textured cutting insert as compared to conventional turning with plane tool. The latter part of the paper uses response surface methodology for performing the experimentation during ultrasonic-assisted turning with textured cutting insert. The experimental data have been analyzed using analysis of variance to highlight significant contributions of depth of cut, feed rate, cutting speed, and percentage intensity of ultrasonic power on surface roughness. The significant interactions among process parameters have also been analyzed to explain the possible alteration in the mechanism of material removal during ultrasonic-assisted turning using self-lubricating inserts. The best surface finish of the order of 0.431 µm has been found under optimal cutting and vibration parameters as evaluated by optimization of the developed statistical model using genetic algorithm.
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Kumar, Narendra, i Satish C. Sharma. "Influence of magnetorheological lubricant behavior on the performance of annular recessed orifice compensated non-textured/textured thrust pad bearing". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 236, nr 6 (6.10.2021): 1133–54. http://dx.doi.org/10.1177/13506501211048308.
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Fluid film bearings operated with smart lubricants have been successfully used to enhance the lubricating performance. This article proposes a computational model to analyze the influence of magnetorheological lubricant on the performance of an annular recessed hybrid thrust bearing system. The governing modified Reynolds equation for circular thrust pad orifice compensated bearing is solved by finite element method. Further, for simulating the flow behavior of magnetorheological lubricant, a constitutive relation for the Bingham model Dave equation, has been used. The numerical results reveal that using magnetorheological lubricant improves the loading carrying capacity and damping coefficient of both annular and circular recess hybrid thrust bearings. Additionally, bearing lubricated with magnetorheological lubricant requires a lesser quantity of flow and hence less pumping power.
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Sun, Junyu, Liyu Chen, Hua Huang, Bing Zhang i Pengfei Qian. "Comprehensive Investigations on Fluid Flow and Cavitation Characteristics in Rotating Disk System". Applied Sciences 12, nr 23 (1.12.2022): 12303. http://dx.doi.org/10.3390/app122312303.
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The present work numerically investigates the flow behavior of Newtonian fluid between rotating disk systems. Rotating disk flow is an embranchment of fundamental flow research, which forms the theoretical basis for the flow media in many disk-type hydraulic machinery, and has been widely applied in energy, aerospace, vehicles, medical, and chemical areas. The Reynolds equation model of the rotating disk flow is established based on a series of assumptions, and considers the characteristics of hexahedral surface textures on the friction disk, and the control equation is dimensionless. The velocity, pressure, and pressure coefficient in oil film are solved by finite difference algorithm, and the shear cavitation incipient position is predicted. Graphical visualization and numerical data about cavitation characteristics are also presented. Furthermore, the cavitation process is researched in CFX and the experiment, eventually verifying the correctness of the numerical analysis. The pressure perturbation caused by texture boundaries and the low pressure at the vortex center induce the initial generation of cavitation, and cavitation effect can obviously enhance lubricating performance. The cavitation region extends from micro-dimples towards non-textured region when texture rate increases. This study can guide design of surface structures such as mechanical seals, wet clutches, and disk turbines.
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Xiang-ping, CHENG, ZHANG You-liang i KANG Lin-ping. "Study on Sealing Performance of Oil Seal with Micro-pores Textured in Rotary Shaft Surface". MATEC Web of Conferences 327 (2020): 03002. http://dx.doi.org/10.1051/matecconf/202032703002.
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In order to improve the reliability and the long life cycle of the lip seals, comprehensive consideration of the liquid film cavitation and JFO mass conservation boundary conditions, the geometry model of the oil seal with micro-diamonds textured on the shaft surface is given, and its mathematical model is built, the relevant numerical calculation method is used, eventually that the film pressure distribution and the micro diamond pores structure parameters effect on the seal performance are obtained under the different operating conditions. The results showed that the dynamic pressure effect caused by the diamond pores can make the oil film pressure field between the axial surface and the lip produced regular axial and radial wave change. At the same time, the change of working conditions strengthen or weaken the change law of the oil film pressure field, so which make the reliability of the liquid pressure, lubricating property and pump suction effect also change accordingly. The size, shape and pores direction of the micro-diamonds texture have great influence on the oil seal performance and lubrication characteristics, which can help to reduce the leakage rate, control the pump suction direction, stable the liquid pressure and reduce the friction. In order to improve the stability of the liquid film and pump suction effect, reduce the leakage rate, friction and wear, the axial surface micro-diamond pores texture of which the cone width ratio is 0.4-0.6, the pores depth is 1.5-4.5μm and the tilt angle is 40°-50° shall be selected for the oil seals.
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Peng, Shijin, Zhiqiang Huang, Meiling Wang, Chen Xiong i Ke Chen. "Study on the Influence of Surface Texture Parameters of Oil Production Screw Motor Rotor on the Tribological Properties of Its Friction Pair". Processes 11, nr 2 (17.02.2023): 618. http://dx.doi.org/10.3390/pr11020618.
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By researching the influence of micro-groove texture on the surface tribological properties of the stator and rotor pair of oil production hydraulic motors, this paper aims to reduce the frictional resistance moment of the spiral pair of hydraulic motors, and further solve the problem of the difficult restart of the pump of a certain type of hydraulic-driven screw pump. According to the spiral pair of screw motors, a metal-rubber flat plate reciprocating friction model is established, and rectangular micro-grooves with different texture angles and depths are machined on the surface of the metal specimen. A combination of finite element simulation and tribological tests is used to carry out a study on the influence of different texture parameters on the friction performance of the hydraulic motor spiral pair. The results showed that at a certain texture angle, the friction coefficient of each specimen basically increases with the texture depth. When the texture depth is constant, the friction coefficient increases first and then decreases with the increase of the texture angle. The texture angle is the main factor affecting the friction coefficient. Under the same test conditions, the friction coefficient of the textured specimen can be reduced by 20.2% compared with the untextured specimen. In the metal-rubber contact pair of the stator and rotor of the hydraulic motor, the friction reduction mechanism of the texture mainly transport the lubricating medium through the micro-grooves to improve the lubricating conditions. Samples with a reasonable design of texture parameters can effectively reduce the friction coefficient of the friction pair without reducing the service life of the hydraulic motor, which is conducive to the smooth restart of the oil production system of the hydraulically driven screw pump.
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Mitsuya, Y., i H. Ota. "Stiffness and Damping of Compressible Lubricating Films Between Computer Flying Heads and Textured Media: Perturbation Analysis Using the Finite Element Method". Journal of Tribology 113, nr 4 (1.10.1991): 819–27. http://dx.doi.org/10.1115/1.2920698.
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Averaged static and dynamic lubrication equations are derived in the general form containing anisotropic film thicknesses dependent on roughness orientation. Solving these equations lead to a presentation of the dynamic characteristics of lubricating films existing between computer flying heads and textured media. Squeeze effects owing to moving roughness accompanying high-frequency spacing variation are found to be given as a function of arithmetically averaged film thickness minus harmonically averaged film thickness. The calculation procedure using the finite element method is then presented for the averaged static and dynamic lubrication equations. Stiffness and damping coefficient are demonstrated indicating the effects of roughness orientation and roughness movement. Under the fixed static film conditions, the roughness decreases the stiffness. In contrast to this, the roughness only slightly affects the damping coefficient. Under fixed load and loading point conditions, these relationships are inversed. It is interesting to note that damping coefficients are decreased by longitudinal roughness and are increased by moving transverse roughness. The reason for this tendency is considered to be that the moving transverse roughness serves to generate the squeeze damping force.
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Chen, Yazhe, Risheng Long, Zhihao Jin, Chen Zhao i Ming Wang. "Research on the Tribological Behavior of Textured Cylindrical Roller Thrust Bearings with Different Distributions of Pits and Nylon Cages under Dry Condition". Lubricants 11, nr 4 (23.03.2023): 154. http://dx.doi.org/10.3390/lubricants11040154.
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Differingfrom the published documents on the effect of texture distributions of sliding tribo-pairs on their friction and wear properties, this study introduced eight patterns to reveal the influence of different distributions of pits on the tribological behavior of textured rolling element bearings with nylon cages under dry condition, namely: Outside-1/4 (OS1/4), Outside-1/2 (OS1/2), Outside-3/4 (OS3/4), Inside-1/4 (IS1/4), Inside-1/2 (IS1/2), Inside-3/4 (IS3/4), Bothside-1/3 (BS) and full (FP). A fiber laser marking system was used to prepare them on the raceways of the shaft washers of cylindrical roller thrust bearings (81107TN). A vertical universal wear test rig was used to obtain their coefficients of frictionunder an axial load of 2600 N and a rotating speed of 250 RPM, without any lubricant provided. Their wear losses and worn surfaces were characterized. The influence mechanism of different distributions on the tribological properties was also discussed. The results show that the self-lubricating performance of nylon cages can ensure the continuous operation (≥5 h) of cylindrical roller thrust bearings under dry condition. The influence of outside-distributed patterns on the friction and wear properties of bearings is significant. The friction-reducing effect and wear resistance of full textured group is improved but not the best. The friction-reducing and anti-wear behavior of OS1/2 is similar to that of FP. In this work, OS3/4 can provide the best tribological performance under self-lubricating conditions. Compared with the data of smooth bearings, its average coefficient of friction and wear loss can be reduced by 37.68% and 38.85%, respectively.This work would provide a valuable reference for the raceway design and reliability optimization of rolling element bearings.
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Burstein, Leonid. "Load-Carrying Capacity of the Lubricating Film in the Gap Between Surfaces Textured by Hemispherical Pores". International Journal of Surface Engineering and Interdisciplinary Materials Science 9, nr 2 (lipiec 2021): 1–23. http://dx.doi.org/10.4018/ijseims.2021070101.
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The load support of a lubricating film that separates the surfaces textured by identical equidistant spaced hemispherical pores was investigated. Two-dimensional time-dependent Reynolds equation is solved numerically for different pore-radius-to-gap and cell-dimension-to-pore-radius ratios and for different relative pore positions of opposite surfaces. The results are compared with the data obtained for the case when only one of the opposite surfaces is covered with pores. The obtained data show a maximum in the carrying capacity of the lubricating film when the cell-to-pore-radii ratio is approximately equal to two, in the case of two opposite surfaces with pores. At small pore radii and with increasing cell dimensions, the load support of two surfaces with pores is much greater than in the case of one surface with pores. This behavior reverses with increasing pore diameter. The presented analysis and the provided MATLAB programs are applicable for mechanisms having rubbing mechanical parts with surfaces covered with pores.
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Wei, Songbo, Hongfei Shang, Chenglong Liao, Junyuan Huang i Bairu Shi. "Tribology Performance of Surface Texturing Plunger". Biomimetics 4, nr 3 (5.08.2019): 54. http://dx.doi.org/10.3390/biomimetics4030054.
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Plunger pumps are widely used in oil pumping units around the world. The water content of the wellbore is increasing along with the development progress, so the lubricating capacity of the well fluids between the plunger and barrel is decreasing correspondingly. Commonly, the substrate material of the plunger and barrel are stainless steel, and the plunger surface is usually covered with nickel-based coating. Therefore, the performance of the plunger and barrel has been affected due to poor lubrication and eccentric wear. Non-smooth surfaces have been proven to improve the tribology performance in many cases. A surface texturing plunger covered with specific dimples has been prepared by using laser surface texturing technology. The morphology of the surface texturing plunger was characterized and analyzed. The tribology performance of surface texturing plunger samples was tested using standard friction and wear test machines with oil and water lubrication, respectively. The results indicated that surface texturing could effectively reduce the coefficient of friction, and the wear resistance of the surface textured samples has been improved to some extent.
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Senniangiri, N., J. Bensam Raj i J. Sunil. "Effects of Temperature and Particles Concentration on the Dynamic Viscosity of Graphene-NiO/Coconut Oil Hybrid Nanofluid: Experimental Study". International Journal of Nanoscience 19, nr 03 (11.10.2019): 1950016. http://dx.doi.org/10.1142/s0219581x19500169.
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In practice, lubricants are used to minimize the friction and wear of frictional surfaces. The disposal of mineral-based lubricating oil possesses environmental issues and forced the development of bio-degradable lubricating agents. The simultaneous mono-dispersion of metallic and metal oxides nanomaterials into lubricating agents may concurrently reveal superior thermo-physical and rheological characteristics. This paper proposes an experimental and theoretical investigation on the dynamic viscosity enhancement of flat platelets textured Graphene/NiO-coconut oil hybrid nanofluids. The results reveal that the dynamic viscosity enhancement of hybrid nanofluids increases with nanomaterial concentration and decreases with temperature. The squat hybrid nanomaterial concentration has less collusion probability and dynamic contact between the mono-dispersed hybrid nanomaterials as it has enough interfacing gaps to conquer superficial surface energy. The high nanomaterial concentration revamps the formation of lamellar-composite agglomerated particles and enhances the dynamic viscosity of base fluid. Further, a theoretical correlation is recommended to estimate the dynamic viscosity of hybrid nanofluid with minimum margin of deviation using artificial neural network (ANN).
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Dai, Yifan, Zefei Tan, Wengang Chen, Dongyang Li, Jubang Zhang, Zexiao Wang, Yukun Mao, Yuhao Wang i Wenxuan Guo. "Effect of Salt Bath Nitriding and Reoxidation Composite Texture on Frictional Properties of Valve Steel 4Cr10Si2Mo". Coatings 13, nr 4 (17.04.2023): 776. http://dx.doi.org/10.3390/coatings13040776.
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In order to improve the service life of 4Cr10Si2Mo valve steel, laser processing technology was used to prepare triangular textures with different area occupancies on the surface of 4Cr10Si2Mo, and then 4Cr10Si2Mo was subjected to salt bath nitridation (salt bath temperature 580 °C) and oxidation (oxidation temperature 400 °C). The mechanism of composite surface treatment technology on friction and wear performance of valve steel was explored. The effect of triangular texture on working surface stress and hydrodynamic pressure was explored using simulation technology, and the mechanism of texture in friction was further studied. The XRD test results showed that after salt bath nitriding and reoxidation treatment, the surface of 4Cr10Si2Mo mainly contained Fe2N oxide film and Fe3O4 and other components. The XPS test showed that the nitriding layer contained Cr-N, and the surface hardness reached 710.5 HV0.5. The simulation results showed that introducing surface texture will increase the stress on the contact surface, especially near the texture. However, under lubricating conditions, the flow field in the textured lumen produces a wedge effect, which increases the oil film pressure. After salt bath nitriding composite texture treatment, the wear resistance of 4Cr10Si2Mo significantly improved under the synergistic effect of the nitrided layer dominated by the magnetite phase (Fe3O4) and the microtexture. Fe3O4 can reduce the friction coefficient and resist oxidation reactions. In addition, the texture of the area occupancy of the texture also affects the surface tribological properties. The texture with an area occupancy rate of 11.45% (low × high is 0.3 mm × 0.3 mm) had the best anti-friction effect, and the friction coefficient reduced by 65%.
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Chen, Chien-Yu, Chung-Jen Chung, Bo-Hsiung Wu, Wang-Long Li, Chih-Wei Chien, Ping-Han Wu i Chung-Wei Cheng. "Microstructure and lubricating property of ultra-fast laser pulse textured silicon carbide seals". Applied Physics A 107, nr 2 (8.03.2012): 345–50. http://dx.doi.org/10.1007/s00339-012-6822-9.
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Hu, Yu Tong, Yong Yong He i Wei Wang. "The Influence of Surface Texture on Abrasive Wear". Key Engineering Materials 823 (wrzesień 2019): 33–40. http://dx.doi.org/10.4028/www.scientific.net/kem.823.33.
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Friction happens everywhere. Abrasives generated in tribological process will result in secondary wear. Abrasive wear is a kind of rather common but harmful wear, which is the main reason for the damage of fifty-percent mechanical components by friction. Surface texturing is an effective method to improve the tribological and lubricating performance of tribo-pairs. In this paper, with different-size diamond particles added into the lubricant and a surface of the tribo-pairs textured by different parameters (diameter and depth) with femtosecond laser, the relationship between the surface texture and the abrasive wear was researched, and the influence of the texture on the abrasive wear was analyzed. The friction experiments were carried out on UMT3. The microstructures were tested and analyzed by SEM, microscope and White Light Interferometer respectively. The experimental results showed that the size of the surface texture, compared with that of abrasives, is the main factor which determines the friction coefficient. As the size of the surface texture is much bigger than that of the abrasives, the texture can accommodate the abrasives efficiently, and thus the friction coefficient is reduced efficiently.
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Antoszewski, Bogdan, i Piotr Kurp. "Effect of Surface Texture on the Sliding Pair Lubrication Efficiency". Lubricants 10, nr 5 (2.05.2022): 80. http://dx.doi.org/10.3390/lubricants10050080.
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The paper presents certain problems related to the lubrication of textured surfaces. It was noted that for a specific load, the lubrication effectiveness will depend on the shape, size and mutual distribution of the texture’s elements. Proposals for determining the lubrication irregularity parameters were presented for textures with a rectangular mesh and round recesses. The experimental part presents the laser texturing methodology, tribological testing methodology and preliminary test results where the significant role of the relationship between the trajectory of motion and the texture mesh was demonstrated.
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Miwa, Reo, Norifumi Miyanaga i Jun Tomioka. "Appearance of Hysteresis Phenomena on Hydrodynamic Lubrication in a Seal-Type Thrust Bearing with Dimples". Materials 14, nr 18 (10.09.2021): 5222. http://dx.doi.org/10.3390/ma14185222.
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This paper described unique hysteresis phenomena that appear in the hydrodynamic lubrication properties of dimpled thrust bearings. A seal-type thrust bearing specimen was textured with dimples. The load-carrying capacity and frictional torque were measured with a constant film thickness and compared to those of a dimple-free specimen. For examining the size of cavitation bubbles that occurred in various conditions, the lubricating area was observed during experiments. The used dimpled specimen produced the load-carrying capacity, and it exhibited an interesting hysteresis phenomenon, the difference in the values in the increasing and decreasing processes of rotational speed. The visualization test results revealed that the size of cavitation bubbles occurring within the dimples strongly affected this phenomenon. In addition, the dimpled specimen was able to reduce the frictional torque compared to the dimple-free specimen. However, the frictional torque did not show the hysteresis loop similar to that shown in the load-carrying capacity.
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Qin, Liguo, Hongjiang Sun, Mahshid Hafezi i Yali Zhang. "Polydopamine-Assisted Immobilization of Chitosan Brushes on a Textured CoCrMo Alloy to Improve its Tribology and Biocompatibility". Materials 12, nr 18 (17.09.2019): 3014. http://dx.doi.org/10.3390/ma12183014.
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Due to their bioinert and reliable tribological performance, cobalt chromium molybdenum (CoCrMo) alloys have been widely used for articular joint implant applications. However, friction and wear issues are still the main reasons for the failure of implants. As a result, the improvement of the tribological properties and biocompatibility of these alloys is still needed. Thus, surface modification is of great interest for implant manufacturers and for clinical applications. In this study, a strategy combining laser surface texturing and chitosan grafting (mussel inspired) was used to improve the tribological and biocompatible behaviors of CoCrMo. The microstructure and chemical composition were investigated by atomic force microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy, respectively. The tribological properties were discussed to determine their synergistic effects. To evaluate their biocompatibility, osteoblast cells were cocultured with the modified surface. The results show that there is a distinct synergistic effect between laser surface texturing and polymer brushes for improving tribological behaviors and biocompatibility. The prepared chitosan brushes on a textured surface are a strong mechanism for reducing friction force. The dimples took part in the hydrodynamic lubrication and acted as the container for replenishing the consumed lubricants. These brushes also promote the formation of a local lubricating film. The wear resistance of the chitosan brushes was immensely improved. Further, the worn process was observed, and the mechanism of destruction was demonstrated. Co-culturing with osteoblast cells showed that the texture and grafting have potential applications in enhancing the differentiation and orientation of osteoblast cells.
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Hua, Xijun, Julius Caesar Puoza, Peiyun Zhang i Jianguo Sun. "Friction properties and lubrication mechanism of self-lubricating composite solid lubricant on laser textured AISI 52100 surface in sliding contact". International Journal of Surface Science and Engineering 12, nr 3 (2018): 228. http://dx.doi.org/10.1504/ijsurfse.2018.094774.
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Sun, Jianguo, Peiyun Zhang, Xijun Hua i Julius Caesar Puoza. "Friction properties and lubrication mechanism of self-lubricating composite solid lubricant on laser textured AISI 52100 surface in sliding contact". International Journal of Surface Science and Engineering 12, nr 3 (2018): 228. http://dx.doi.org/10.1504/ijsurfse.2018.10016052.
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Huang, Mingji, Ke Li i Xiuping Dong. "Study on Friction Characteristics of Laser Textured Metal Rubber Microfilaments under Solid Lubricating Grease". Protection of Metals and Physical Chemistry of Surfaces 57, nr 2 (marzec 2021): 361–66. http://dx.doi.org/10.1134/s2070205121010111.
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Ze, Wu, Deng Jianxin, Chen Yang, Xing Youqiang i Zhao Jun. "Performance of the self-lubricating textured tools in dry cutting of Ti-6Al-4V". International Journal of Advanced Manufacturing Technology 62, nr 9-12 (7.01.2012): 943–51. http://dx.doi.org/10.1007/s00170-011-3853-x.
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Lal, Roop, i R. C. Singh. "Investigations of tribodynamic characteristics of chrome steel pin against plain and textured surface cast iron discs in lubricated conditions". World Journal of Engineering 16, nr 4 (6.07.2019): 560–68. http://dx.doi.org/10.1108/wje-09-2018-0311.
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Purpose The purpose of this paper was to carry out an experimental study to investigate tribodynamics at the interface of chrome steel pin with the plain and textured surface cast iron discs in a fully flooded condition. Design/methodology/approach A friction and wear tester (tribometer) was used for conducting the experiment at different operating parameters. Lubricating oil used in this experiment was SAE-15W40, which directly supplied at the interface and ensured a fully flooded lubricating condition. Measurements of different parameters, such as friction coefficient, the rate of wear, the amplitude of vibration, rise in temperature and intensity of sound, were considered at different loads. The input parameters were taken in a range viz. Loads from 1.9 MPa to 3.1 MPa, sliding speeds from 2 to 10 m/s and distance travelled ranged from 1000 to 5000 m. Findings In the investigation, it was found that there was a decrease in friction coefficient and wear rate at the interface formed by the chrome steel pin with textured surface cast iron disc when compared with friction coefficient and wear rate at the interface formed by the chrome steel pin and the plain surface disc of cast iron. Originality/value Also, it was inferred that temperature, vibration and noise level, at the interface formed by the chrome steel pin and plain surface cast iron disc, increased, which governed the interface stability. The novelty of this investigation lies in the identification of the parameters on which interface stability depends.