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学者姓名：任志英
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Abstract ：
The emission of copper-containing particulate matter during braking poses a threat to the natural environment, yet copper plays a crucial role in resin-based brake pads. Developing a copper-free brake pad with high heat-fade resistance has emerged as a significant current topic. This study employs andalusite-filled resin-based brake pads as a replacement for copper in brake pads. It investigates the effects of andalusite mesh size and content on the physical properties, mechanical properties, and tribological wear performance of the brake pads, and explores the wear mechanism of andalusite-filled copper-free resin-based brake pads. The results indicate that adding andalusite to the brake pads enhances their thermal stability, hardness, impact strength, and density, effectively improving the medium-to-high temperature friction coefficient and heat-fade resistance of the brake pads. As the mesh size of andalusite increases, the hardness of the brake pads also increases, while the impact strength initially increases and then decreases. As the weight content of andalusite increases, the hardness and impact strength of the brake pads gradually increase. When the andalusite mesh size is 320 mesh and the content is 20%, the brake pads exhibit good comprehensive tribological wear performance. The addition of andalusite not only increases the medium-to-high temperature friction coefficient of the brake pads but also strengthens their high-temperature friction surface. This study successfully replaces copper, which is harmful to the environment and costly, with andalusite in brake pads, obtaining a high heat-fade resistance metal-free resin-based brake pad. © The Author(s) 2025.
Keyword ：
Andalusite Andalusite Copper-free brake pads Copper-free brake pads Friction and wear Friction and wear Heat-fade resistance Heat-fade resistance Wear mechanism Wear mechanism
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| GB/T 7714 | Zheng, K. , Min, Z. , Zhang, F. et al. High Heat-fade Resistance, Metal-free Resin-based Brake Pads: A Step towards Replacing Copper by Using Andalusite [J]. | Chinese Journal of Mechanical Engineering (English Edition) , 2025 , 38 (1) . |
| MLA | Zheng, K. et al. "High Heat-fade Resistance, Metal-free Resin-based Brake Pads: A Step towards Replacing Copper by Using Andalusite" . | Chinese Journal of Mechanical Engineering (English Edition) 38 . 1 (2025) . |
| APA | Zheng, K. , Min, Z. , Zhang, F. , Ren, Z. , Lin, Y. . High Heat-fade Resistance, Metal-free Resin-based Brake Pads: A Step towards Replacing Copper by Using Andalusite . | Chinese Journal of Mechanical Engineering (English Edition) , 2025 , 38 (1) . |
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金属橡胶（MR）是一种纯金属的多孔减振/隔振材料，可作为极端环境下传统高分子减振/隔振材料的绝佳代替者。然而，目前关于其在海洋环境中的腐蚀行为及静载压缩蠕变性能研究还较少，影响了金属橡胶的进一步工程应用推广。采用表面硅烷化（S）、化学酸洗（P）和化学酸洗-表面硅烷化（P-S）工艺对制备好的MR试样进行表面处理，得到三种不同表面性能的MR试样。在5wt.%NaCl溶液中进行间浸腐蚀方式的静载压缩蠕变试验，并利用SEM、EDS和电化学工作站等表征手段研究MR的微观形貌、腐蚀产物元素组成、耐腐蚀和抗蠕变性能。结果表明：间浸腐蚀蠕变试验后，三种试样的腐蚀产物元素以O、Fe和Cr为主。P-S-MR试样的腐蚀电位(E
Keyword ：
海洋腐蚀环境 海洋腐蚀环境 硅烷化 硅烷化 腐蚀行为 腐蚀行为 蠕变性能 蠕变性能 金属橡胶 金属橡胶
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| GB/T 7714 | 赖福强 , 胡安琼 , 郝翔飞 et al. 金属橡胶在不同表面处理工艺下的腐蚀行为及静载压缩蠕变性能 [J]. | 中国表面工程 , 2025 , 38 (01) : 141-151 . |
| MLA | 赖福强 et al. "金属橡胶在不同表面处理工艺下的腐蚀行为及静载压缩蠕变性能" . | 中国表面工程 38 . 01 (2025) : 141-151 . |
| APA | 赖福强 , 胡安琼 , 郝翔飞 , 白鸿柏 , 任志英 , 吴乙万 . 金属橡胶在不同表面处理工艺下的腐蚀行为及静载压缩蠕变性能 . | 中国表面工程 , 2025 , 38 (01) , 141-151 . |
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Diamond has the highest thermal conductivity and the highest hardness in nature, ultralow thermal expansion coefficient, becoming the typically fourth generation semiconductor. High-performance devices and chips stringently require atomic-level surface of diamond, i.e. surface roughness Sa <0.2 nm. This is a challenge to achieve atomic-level surface on the hardest diamond with ultrahigh chemical inertness. This review presents challenges, progresses and future directions of advanced atomic-level polishing for single crystal diamond. It includes chemical mechanical polishing, ion beam polishing, light-assisted polishing and plasma-assisted polishing. The review analyses the historical development, material removal mechanisms, advantages and disadvantages of these polishing methods. Traditional polishing based on classical mechanics faces challenges to garner atomic-level surface. Future directions of atomic-level polishing are necessary to develop novel polishing methods with hybrid energy fields, such as plasma, light and chemical fields, etc. Cross-scale coupling models of multi-physics fields need to be proposed to develop novel polishing methods, consisting of polishing setups, optimization of processing parameters, polishing pads and slurries. This review provides new insights to acquire atomic-level surface of diamond using advanced polishing methods for stakeholders in education, academia and industries. © 2025 Elsevier B.V.
Keyword ：
Atomic-level polishing Atomic-level polishing Chemical mechanical polishing Chemical mechanical polishing Diamond Diamond Ion beam polishing Ion beam polishing Light-assisted polishing Light-assisted polishing
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| GB/T 7714 | Yu, Z. , Zhang, Z. , Zhao, F. et al. Review on advanced atomic-level polishing for single crystal diamond [J]. | Surfaces and Interfaces , 2025 , 72 . |
| MLA | Yu, Z. et al. "Review on advanced atomic-level polishing for single crystal diamond" . | Surfaces and Interfaces 72 (2025) . |
| APA | Yu, Z. , Zhang, Z. , Zhao, F. , Hu, J. , Zhong, S. , Ren, Z. et al. Review on advanced atomic-level polishing for single crystal diamond . | Surfaces and Interfaces , 2025 , 72 . |
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To address the wear failure of brake drum surfaces in band brakes caused by high-frequency and heavy-load service conditions and to improve the wear resistance of the brake drum, FeCrNi-WC medium entropy alloy composite coatings were prepared on the surface of brake drum using high-speed laser cladding. Additionally, to prevent coating cracking and enhance microstructural homogeneity, the substrate was preheated at different temperatures (room temperature, 200 degrees C, 300 degrees C, and 400 degrees C). Based on the characterization and testing of the coating's phase structure, forming quality, microstructure, and wear resistance, the results indicated that the primary phase of the coating was an FCC solid solution, WC, W2C, Fe3W3C and Cr23C6, and the change in substrate preheating temperature did not affect the primary phase structure of the coatings. As the preheating temperature increased, the number of defects in the coating gradually decreased. The enhanced dissolution of WC particles in the coatings promoted the precipitation of Fe3W3C eutectic carbides, contributing to coating reinforcement. At a preheating temperature of 300 degrees C, FeCrNi-WC medium entropy alloy composite coating with no cracks and porosity and good forming quality could be achieved. At this temperature, the hardness of the coating reached 662.67 HV0.2, approximately 2.9 times that of the substrate. The excellent comprehensive properties enabled the coating to form a stable and dense tribolayer during sliding wear, resulting in a low friction coefficient accompanied by the lowest wear rate, with wear resistance improved by nearly two orders of magnitude compared to the substrate.
Keyword ：
Composite coatings Composite coatings High-speed laser cladding High-speed laser cladding Medium entropy alloy Medium entropy alloy Tribolayer Tribolayer Wear resistance Wear resistance
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| GB/T 7714 | Ren, Zhiying , Wang, Xin , Zhao, Haichao et al. Microstructure and tribological properties of FeCrNi-WC medium entropy alloy composite coatings prepared by high-speed laser cladding with different preheating temperatures [J]. | SURFACE & COATINGS TECHNOLOGY , 2025 , 504 . |
| MLA | Ren, Zhiying et al. "Microstructure and tribological properties of FeCrNi-WC medium entropy alloy composite coatings prepared by high-speed laser cladding with different preheating temperatures" . | SURFACE & COATINGS TECHNOLOGY 504 (2025) . |
| APA | Ren, Zhiying , Wang, Xin , Zhao, Haichao , Duan, Bingyan , Zhou, Li , Mou, Honglin et al. Microstructure and tribological properties of FeCrNi-WC medium entropy alloy composite coatings prepared by high-speed laser cladding with different preheating temperatures . | SURFACE & COATINGS TECHNOLOGY , 2025 , 504 . |
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Entangled porous metallic pseudo-rubber (EPMPR) is formed by interlaced helical metal wires, and its unique structure can convert mechanical vibration energy into heat, providing significant damping effects. This study innovatively proposes a method for constructing the elastic hysteresis curve of EDMMR at the physical level, and decomposes and extracts the hysteresis curve using virtual manufacturing technology (VMT). Based on finite element numerical calculation nodes, this study constructs the stiffness curve of EPMPR's series-parallel structure, and considers the contact behavior of EPMPR, especially under high-temperature conditions, through dynamic evolution analysis of discretized numerical models of spatial contact behavior, further studying its damping hysteresis behavior. Specifically, this study also proposes for the first time and comprehensively analyzes the dynamic and static parameters of EPMPR under different temperatures and loads, providing in-depth insights into its mechanical behavior and energy dissipation mechanisms. Experimental results demonstrate that under the complex topology structure and thermomechanical coupling, the elastic hysteresis curve of EPMPR can accurately predict its damping characteristics under different high-temperature environments, providing a theoretical foundation for EPMPR's application in advanced equipment and structural extreme environments.
Keyword ：
Constitutive model Constitutive model Damping hysteresis characteristics Damping hysteresis characteristics Entangled porous metallic pseudo-rubber Entangled porous metallic pseudo-rubber (EPMPR) (EPMPR) Thermo-mechanical coupling Thermo-mechanical coupling Virtual manufacturing technology (VMT) Virtual manufacturing technology (VMT)
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| GB/T 7714 | Wang, Qinwei , Ren, Zhiying , Shi, Linwei et al. Hysteresis characteristics of entangled porous metallic pseudo-rubber under complex topological structures and thermomechanical coupling effects [J]. | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS , 2025 , 111 . |
| MLA | Wang, Qinwei et al. "Hysteresis characteristics of entangled porous metallic pseudo-rubber under complex topological structures and thermomechanical coupling effects" . | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS 111 (2025) . |
| APA | Wang, Qinwei , Ren, Zhiying , Shi, Linwei , Huang, Zihao , Feng, Shaotong , Li, Shuaijun . Hysteresis characteristics of entangled porous metallic pseudo-rubber under complex topological structures and thermomechanical coupling effects . | EUROPEAN JOURNAL OF MECHANICS A-SOLIDS , 2025 , 111 . |
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Superhydrophilic-underwater superoleophobic materials have received extensive attention in recent years due to their excellent performance in oil-water separation. However, they are still challenged by practical limitations. One of the main issues is the modification of traditional metal-based surfaces. These surfaces are typically modified through roughening and chemical treatment, but they still face significant challenges. Here, we report a metal rubber(MR) filtration material with exceptional superhydrophilic-underwater superoleophobic properties, fabricated through a synchronous process combining two-dimensional(2D) iron oxide sheets and zerodimensional(0D) silica nanospheres. This composite structure enhances surface wettability by integrating the dimensional effects of 2D and 0D components. This superwettable material, termed P-MRFS, incorporates a composite structure that enhances surface wettability by integrating the size effects of both 2D and 0D components. The P-MRFS material achieved a peak separation flux over 2500 L & sdot;m-2 & sdot;h-1 and up to 99.88% purity across various oil in water emulsions, including hexane, petroleum ether, dimethylbenzene, dichloroethane, and toluene, with a stable efficiency of 99.7% after 30 separation cycles. P-MRFS demonstrated durability under demanding conditions, maintaining over 99.5% separation efficiency after 48 hours in acidic, alkaline, and saline solutions and following 400 cm of abrasion under a 200 g load. Importantly, the study employed computational fluid dynamics(CFD) simulations to analyze the micro-scale mechanisms of emulsion separation, enabling realtime observation of droplet dynamics and revealing interactions within the multi-fiber structure that enhance separation efficiency. Overall, the P-MRFS material showed outstanding stability in corrosion and abrasion resistance, sustaining high emulsion separation performance even in complex environments. These findings suggest the material's high potential for future applications in oil-water separation, environmental protection, including crude oil recovery, and other industrial uses, underscoring its significant practical utility.
Keyword ：
CFD simulation CFD simulation Emulsion separation Emulsion separation Microstructural dimension control Microstructural dimension control oleophobic oleophobic Super hydrophilic Super hydrophilic Surface composite dimension structure Surface composite dimension structure underwater super underwater super
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| GB/T 7714 | Pi, Peng , Ren, Zhiying , Pan, Ling et al. Composite dimensional structure superhydrophilic-underwater superoleophobic material for efficient separation of oil-in-water emulsions [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2025 , 362 . |
| MLA | Pi, Peng et al. "Composite dimensional structure superhydrophilic-underwater superoleophobic material for efficient separation of oil-in-water emulsions" . | SEPARATION AND PURIFICATION TECHNOLOGY 362 (2025) . |
| APA | Pi, Peng , Ren, Zhiying , Pan, Ling , Lin, Youxi , Yang, Yu , Li, Yuedan . Composite dimensional structure superhydrophilic-underwater superoleophobic material for efficient separation of oil-in-water emulsions . | SEPARATION AND PURIFICATION TECHNOLOGY , 2025 , 362 . |
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Focusing on the nonlinear hysteresis behavior of Entangled Metal Pseudo Rubber (EMPR) under quasi-static compression, this study investigates the impact of self-contact friction on its energy dissipation and path memory characteristics. By employing virtual manufacturing and finite element numerical simulation, we digitally reproduce the entire process from wire winding to cold stamping and precisely tune the contact friction coefficient between wire turns under interference-free conditions. The results show that the hysteresis behavior of EMPR can be decomposed into three mechanically meaningful components: nonlinear elastic backbone force, friction force, and hysteretic force. Among these components, the elastic backbone force remains consistent as a unique function of strain, while the friction and hysteretic contributions determine the opening of the hysteresis loop and the material's path memory features. Numerical simulations and experimental validations demonstrate that adjusting the friction coefficient can significantly alter the material's energy absorption capacity and hysteresis loop area, thereby providing favorable conditions for extracting, identifying, and verifying the physical meaning of the elastic backbone line. This study not only deepens our understanding of the mesoscopic frictional contact mechanism in EMPR and the construction of physically meaningful hysteresis constitutive relationships, but also offers an important theoretical foundation and technical reference for designing high-performance EMPR components.
Keyword ：
Constitutive modeling Constitutive modeling Entangled Metal Pseudo Rubber (EMPR) Entangled Metal Pseudo Rubber (EMPR) Nonlinear hysteresis Nonlinear hysteresis Self-contact friction Self-contact friction Virtual manufacturing Virtual manufacturing
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| GB/T 7714 | Shi, Linwei , Wang, Qinwei , Shen, Liangliang et al. Influence of self-contact friction on the hysteresis mechanical behavior of Entangled Metal Pseudo Rubber [J]. | TRIBOLOGY INTERNATIONAL , 2025 , 209 . |
| MLA | Shi, Linwei et al. "Influence of self-contact friction on the hysteresis mechanical behavior of Entangled Metal Pseudo Rubber" . | TRIBOLOGY INTERNATIONAL 209 (2025) . |
| APA | Shi, Linwei , Wang, Qinwei , Shen, Liangliang , Pang, Ling , Huang, Jianxiang , Ren, Zhiying . Influence of self-contact friction on the hysteresis mechanical behavior of Entangled Metal Pseudo Rubber . | TRIBOLOGY INTERNATIONAL , 2025 , 209 . |
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Based on the digital forming method of metal rubber, the Global point topology model (GPTM) reflecting the spatial characteristics is established to realize the mapping relationship between the index hardening characteristics of metal rubber and the wire turn motion behavior under the macro scale. The research shows that, with the reduction of the allowable wire turn motion space and the increase of the wire turn surface roughness, the internal multi-regional wire turns successively appear the spatial motion interference phenomenon, that is, the generation of the hard friction region, which is often the main cause of the metal rubber index hardening characteristics. At the same time, two kinds of materials, SUS-304 and Nichrome, are introduced to establish a microscopic model of metal surface roughness with fractal characteristics, aiming at realizing the research on the cross-scale friction mechanical behavior of metal rubber from the material level (microscopic level). The results show that HCP increases 97.6 % and 13.9 % respectively when the material is plastically deformed. While increasing the hardness and strength, the extrusion friction at the contact interface is increased, which affects the friction mechanical properties of metal rubber. The metal rubber (ASS-MR) made of 304 stainless steel entered the plastic phase earlier than that made of Cr20Ni80 (NI-MR) and increased the strength by phase change and rapidly entered the index hardening. The difference of mechanical behavior in the soft phase is closely related to the change of HCP on the contact surface of wire turn in the sliding process. Through the bottom-up trans-scale analysis method, the multi-level mapping relationship of metal rubber from the bottom material to the space structure and then to the nonlinear mechanical behavior is realized, which provides a new idea for exploring the basic performance and mechanism of this kind of micro-pore topology materials. © 2025 Elsevier Ltd
Keyword ：
Extrusion molding Extrusion molding Liquid crystals Liquid crystals Mapping Mapping Metal extrusion Metal extrusion Metal molding Metal molding Microhardness Microhardness Microporous materials Microporous materials Rubber molding Rubber molding Strain hardening Strain hardening
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| GB/T 7714 | Ren, Zhiying , Xu, Bangguo , Shen, Liangliang et al. Research on the cross-scale mapping mechanism of friction mechanical behavior of metal rubber based on topological interference: Material level friction strengthening phenomenon [J]. | Tribology International , 2025 , 211 . |
| MLA | Ren, Zhiying et al. "Research on the cross-scale mapping mechanism of friction mechanical behavior of metal rubber based on topological interference: Material level friction strengthening phenomenon" . | Tribology International 211 (2025) . |
| APA | Ren, Zhiying , Xu, Bangguo , Shen, Liangliang , Shi, Linwei , Tang, Kequan , Song, Qiang et al. Research on the cross-scale mapping mechanism of friction mechanical behavior of metal rubber based on topological interference: Material level friction strengthening phenomenon . | Tribology International , 2025 , 211 . |
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The limited surface hardening depth of duplex stainless steel (DSS) through conventional ultrasonic surface rolling process (USRP), attributed to its high strength and plastic deformation resistance, remains a critical technical challenge. This study proposes a novel hybrid thermal-field assisted USRP (H-USRP) strategy to achieve superior surface strengthening for 2205 DSS. Systematic investigations were conducted on the corrosion behavior and tribological performance under extreme temperatures (400 degrees C, 25 degrees C,-60 degrees C) and artificial seawater environments. The synergistic interaction between thermally induced plasticity and severe plastic deformation during H-USRP generates ultra-refined surface grains, simultaneously improving surface finish (63.11 % roughness reduction), hardness (10.88 % increase), and hardening depth (103.43 % enhancement) compared to conventional USRP. Notably, H-USRP modified surfaces exhibit 62.5 % enrichment of Cr2O3 in passive films and 79.17 % reduction in corrosion rate. The wear volume under high-temperature, cryogenic, and corrosive conditions decreases by 10.92 %, 16.43 %, and 19.37 %, respectively, with concurrent reduction in friction coefficients. Particularly under 1.0 V applied potential, H-USRP effectively suppresses corrosive wear through 55.34 % decreased corrosion current and reduced synergistic damage (Delta Wfccontribution decreased to 57.15 %). These findings demonstrate that the proposed H-USRP strategy significantly improves surface integrity and strengthening depth, enabling superior long-term service performance of DSS components in extreme operating conditions.
Keyword ：
Corrosion resistance Corrosion resistance Duplex stainless Duplex stainless Extreme environments Extreme environments Hybrid thermal-field assisted Hybrid thermal-field assisted Ultrasonic rolling Ultrasonic rolling Wear Wear
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| GB/T 7714 | Zheng, Kaikui , Li, Yuanteng , Xie, Guoxin et al. Enhanced surface strengthening of 2205 duplex stainless steel through hybrid thermal-field assisted ultrasonic surface rolling process: corrosion and tribological behavior under extreme environments [J]. | TRIBOLOGY INTERNATIONAL , 2025 , 212 . |
| MLA | Zheng, Kaikui et al. "Enhanced surface strengthening of 2205 duplex stainless steel through hybrid thermal-field assisted ultrasonic surface rolling process: corrosion and tribological behavior under extreme environments" . | TRIBOLOGY INTERNATIONAL 212 (2025) . |
| APA | Zheng, Kaikui , Li, Yuanteng , Xie, Guoxin , Pan, Ling , Ren, Zhiying . Enhanced surface strengthening of 2205 duplex stainless steel through hybrid thermal-field assisted ultrasonic surface rolling process: corrosion and tribological behavior under extreme environments . | TRIBOLOGY INTERNATIONAL , 2025 , 212 . |
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The hemispherical shell metal rubber (HSMR) exhibits high elasticity and large damping properties. Compared with a traditional metal hemispherical shell, this structure can elastically recover to its original shape after undergoing a certain degree of large deformation. However, its nonlinear mechanical properties cannot be accurately characterized, limiting its extensive application in vibration damping and impact resistance. To address this issue, this article develops a multiscale quasistatic nonlinear mechanical model, deriving nonlinear mechanical models for two deformation stages: the flattening stage and the denting stage. The influence of relative density and shape parameters on the generation of negative stiffness is analyzed. Experimental validation confirms the accuracy of the restoring force, nonlinear elastic force, and viscous damping force models for HSMR at different relative densities. The results show that relative density primarily affects the peak restoring force during the flattening stage, while thickness significantly influences the range of negative stiffness and the minimum negative stiffness during the denting stage. Furthermore, for three different relative densities, the residuals between the theoretical model's restoring force-displacement curves exceed 98.82%, and the maximum relative error between the theoretical model's static loss factor and the experimental results is 9.80%. © 2025 Wiley-VCH GmbH.
Keyword ：
hemispherical shell metal rubbers hemispherical shell metal rubbers negative stiffness negative stiffness nonlinear elastic forces nonlinear elastic forces viscous damping forces viscous damping forces
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| GB/T 7714 | Huang, Z. , Ren, Z. , Zhou, C. et al. Analysis of the Quasistatic Nonlinear Mechanical Model of Hemispherical Shell Metal Rubber [J]. | Advanced Engineering Materials , 2025 . |
| MLA | Huang, Z. et al. "Analysis of the Quasistatic Nonlinear Mechanical Model of Hemispherical Shell Metal Rubber" . | Advanced Engineering Materials (2025) . |
| APA | Huang, Z. , Ren, Z. , Zhou, C. , Fan, J. , Lin, J. , Huang, J. . Analysis of the Quasistatic Nonlinear Mechanical Model of Hemispherical Shell Metal Rubber . | Advanced Engineering Materials , 2025 . |
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