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学者姓名：郑开魁
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目的 研究稠化剂组分中二元酸和硼酸对润滑脂在摩擦副表面润滑性能的影响.方法 分别建立具有正弦曲面凸峰的粗糙面边界润滑系统模型,以及光滑壁面的反应力场边界润滑系统模型,通过分子动力学模拟方法研究 12-羟基硬脂酸/壬二酸润滑脂体系(A润滑脂)、12-羟基硬脂酸/十二烷二酸润滑脂体系(B润滑脂)和12-羟基硬脂酸/壬二酸/硼酸润滑脂体系(C润滑脂)的承载能力、抗剪切能力、摩擦性能,并对C润滑脂进行成键和摩擦化学反应膜分析.结合润滑脂的微摩擦磨损试验,揭示二元酸链长和硼酸对润滑脂摩擦性能的影响.结果 在加压阶段,随着压力的增加,润滑脂密度增大,且分层现象越明显.当压力 Pz=50 MPa时,组分中含硼酸的C润滑脂在各处的密度均较小,表现出最佳的承载能力.在剪切过程中,C润滑脂始终将 2 个粗糙峰隔开,油膜不破裂,承载能力最高;含长链二元酸的B润滑脂和含硼酸的C润滑脂的最大应力相较于A润滑脂,分别降低了 27.1%、57.1%.同时,C润滑脂的摩擦因数相对稳定,在 0.075～0.095范围内波动,其均值为 0.090,相较于 B 润滑脂和 A 润滑脂,分别降低了 16.7%、22.2%,具有优良的力学性能.摩擦磨损结果表明,在稠化剂组分中添加硼酸后,润滑脂的理化性能得到显著提升,摩擦因数及均值分别为 0.085～0.095 和 0.091,模拟结果与试验结果一致.结论 相较于稠化剂中含短链二元酸的润滑脂,含长链二元酸的润滑脂表现出较好的抗剪切能力和摩擦性能.在稠化剂中添加硼酸后,稠化剂的结构得到强化,润滑脂表现出更为优异的抗磨减摩性能.这是因为在硼酸的作用下,润滑脂中的锂皂和硼酸基团不仅形成了配位键,而且能在固体壁面上形成摩擦反应膜,显著提高了润滑脂的物理化学性能.
Keyword ：
分子动力学 分子动力学 摩擦反应膜 摩擦反应膜 摩擦性能 摩擦性能 润滑脂 润滑脂 稠化剂组分 稠化剂组分
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| GB/T 7714 | 潘伶 , 吴允李 , 连金良 et al. 稠化剂组分对润滑脂摩擦性能的影响 [J]. | 表面技术 , 2025 , 54 (5) : 83-92 . |
| MLA | 潘伶 et al. "稠化剂组分对润滑脂摩擦性能的影响" . | 表面技术 54 . 5 (2025) : 83-92 . |
| APA | 潘伶 , 吴允李 , 连金良 , 郑开魁 , 郭锦阳 . 稠化剂组分对润滑脂摩擦性能的影响 . | 表面技术 , 2025 , 54 (5) , 83-92 . |
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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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ZIF-8 is widely applied in lubrication,adsorption,and catalysis owing to its unique physicochemical properties.Previous experimental studies have demonstrated its feasibility as a lubricant additive.In the present work,the lubricating performance of ZIF-8 as an additive to lithium-based grease is quantitatively and dynamically analyzed at the atomic scale using molecular dynamics simulations.Friction wear experiments are also conducted to elucidate the lubrication mechanism of ZIF-8.The simulation and experimental results indicate that the incorporation of ZIF-8 effectively enhances the antifriction and antiwear characteristics of lithium grease.The most significant improvement in the lubrication performance of the grease is obtained at a mass fraction of 2.0 wt.％ZIF-8,which reduces the friction factor μ of the grease by about 17.0％and the wear by～40.0％.Furthermore,the molecular dynamics simulations reveal that ZIF-8 primarily functions as a ball bearing under low-load conditions.However,under high-load conditions,ZIF-8 undergoes significant deformation and primarily acts as a filler.This explains the experimentally observed significant reduction in friction coefficient after the addition of ZIF-8.The results of this study provide a theoretical foundation for the development of new environmentally friendly grease additives.
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| GB/T 7714 | Ling Pan , Zhi Li , Yunli Wu et al. Study on the sliding tribological behavior of ZIF-8 under lubricating grease conditions [J]. | 纳米技术与精密工程（英文版） , 2025 , 8 (1) : 25-35 . |
| MLA | Ling Pan et al. "Study on the sliding tribological behavior of ZIF-8 under lubricating grease conditions" . | 纳米技术与精密工程（英文版） 8 . 1 (2025) : 25-35 . |
| APA | Ling Pan , Zhi Li , Yunli Wu , Kaikui Zheng , Yuqing Han . Study on the sliding tribological behavior of ZIF-8 under lubricating grease conditions . | 纳米技术与精密工程（英文版） , 2025 , 8 (1) , 25-35 . |
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This study investigated the fabrication of a strengthened Ti-TiO2 material with adding 0.5 wt.% TiO2 nanoparticles via selective laser melting process in comparison with CP-Ti. Through the process parameters optimized by response surface methodology, the Ti-TiO2 material fabricated by SLM showed remarkable tensile strength of 800.6 MPa and elongation of 14%, as compared to the fabricated CP-Ti with tensile strength of 594.0 MPa and elongation of 21%. The x-ray diffraction patterns of fabricated specimens showed the expansion of the hcp-Ti lattice along the c-axis due to dissolved oxygen atoms from the decomposition of TiO2 nanoparticles. The microstructure analysis observed remains of incompletely decomposed TiO2 and TiO phases in SLMed Ti-TiO2 material, which was distinguished from former studies. Consequently, the decomposition behavior of added TiO2 nanoparticles associated with the dissolved oxygen in the Ti-matrix during the SLM process was discussed. Based on the evaluation of both the solution effect of oxygen atoms and the reinforcing effect of undecomposed nanoparticles, the dissolved oxygen from decomposed TiO2 was considered the primary factor in the intensified strength of SLMed Ti-TiO2 material. These results could offer novel insights into the additive manufacturing of high-strength and biocompatible titanium alloy via the SLM process.
Keyword ：
additive manufacturing additive manufacturing biomaterials biomaterials composites composites metallic matrix metallic matrix strengthening mechanism strengthening mechanism titanium titanium
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| GB/T 7714 | Xiang, Hongliang , Chen, Xiaoyu , Huang, Ye et al. Decomposition Behavior and Strengthening Mechanism of Ti-TiO2 Material in Selective Laser Melting Process [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2025 . |
| MLA | Xiang, Hongliang et al. "Decomposition Behavior and Strengthening Mechanism of Ti-TiO2 Material in Selective Laser Melting Process" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2025) . |
| APA | Xiang, Hongliang , Chen, Xiaoyu , Huang, Ye , Wu, Chaochao , Mou, Gang , Zheng, Kaikui . Decomposition Behavior and Strengthening Mechanism of Ti-TiO2 Material in Selective Laser Melting Process . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2025 . |
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The Al-Si coating coated on press-hardened steel brought problems such as element segregation, weld softening, and poor mechanical properties to laser-welded joints. The influence of different oscillation paths on the microstructure and properties of laser-welded joints of Al-Si-coated 22MnB5 steel were studied. The findings indicated that the concave degree of the upper surface of the weld with circular path was significantly smaller than that of the linear path, the "8" path, and the "infinity" path. The microstructure of the welds under the four paths calculated by Pandat software was martensite and ferrite, which was consistent with the experimental results. Compared with the linear path, "infinity" path, and "8" path, the oscillating laser beam with circular path caused the fluid in the molten pool to form a stable eddy current effect along the oscillating direction, which promoted the diffusion of Al. The content of alpha-ferrite in the weld with circular path was reduced to 7.8%, and the tensile strength of the welded joint exceeded 1500 MPa. During the tensile process, the cracks in the weld originated at the interface of large-size alpha-ferrite and martensite near the weld surface. Except for the circular path, the main crack in the weld under the other three paths formed branching cracks toward the enrichment of ferrite. The fracture of the weld under the four paths was composed of cleavage surface and small dimples, but the ductile zone of the fracture with circular path was significantly bigger than that of the other three.
Keyword ：
laser welding laser welding mechanical property mechanical property microstructure microstructure oscillation path oscillation path weld formation weld formation
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| GB/T 7714 | Xu, Wei , Yang, Shanglu , Tao, Wu et al. The Influence of Different Oscillation Paths on the Microstructure and Properties of Laser-Welded Joints of Al-Si-Coated 22MnB5 Steel [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2025 . |
| MLA | Xu, Wei et al. "The Influence of Different Oscillation Paths on the Microstructure and Properties of Laser-Welded Joints of Al-Si-Coated 22MnB5 Steel" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2025) . |
| APA | Xu, Wei , Yang, Shanglu , Tao, Wu , Zhang, Xuzhi , Zheng, Kaikui , Wu, Guijie . The Influence of Different Oscillation Paths on the Microstructure and Properties of Laser-Welded Joints of Al-Si-Coated 22MnB5 Steel . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2025 . |
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ARTICLE HIGHLIGHTS • The results of friction and wear tests show that when ZIF-8 is used as a lubricant additive for lithium-based grease, the best antifriction and antiwear effects can be achieved when the mass fraction is 2.0 wt. %. • Experimental and simulation results show that ZIF-8 with a mass fraction of 2.0 wt. % reduces the friction coefficient μ of lithium-based grease by about 17% and reduces wear by about 40%. • Molecular dynamics simulations show that ZIF-8 mainly reduces friction and resists wear by increasing the load-bearing capacity of the grease and the role of ball bearings. Additionally, as the load increases, ZIF-8 particles undergo a certain amount of deformation, gradually weakening the action of the ball bearings. © 2024 Author(s).
Keyword ：
Ball bearings Ball bearings Friction Friction Lubricating greases Lubricating greases Tribology Tribology Wear of materials Wear of materials
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| GB/T 7714 | Pan, Ling , Li, Zhi , Wu, Yunli et al. Study on the sliding tribological behavior of ZIF-8 under lubricating grease conditions [J]. | Nanotechnology and Precision Engineering , 2025 , 8 (1) . |
| MLA | Pan, Ling et al. "Study on the sliding tribological behavior of ZIF-8 under lubricating grease conditions" . | Nanotechnology and Precision Engineering 8 . 1 (2025) . |
| APA | Pan, Ling , Li, Zhi , Wu, Yunli , Zheng, Kaikui , Han, Yuqing . Study on the sliding tribological behavior of ZIF-8 under lubricating grease conditions . | Nanotechnology and Precision Engineering , 2025 , 8 (1) . |
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The demand for butt welding of stainless-steel thin plates has been increasing year by year in industries such as shipbuilding, pharmaceuticals, petrochemicals, and food processing. However, during the butt welding of thin plates, the low structural rigidity causes real-time change in the gap, which complicates the ability of automated welding to achieve uniform weld seam geometry. Therefore, this paper aims to overcome the challenges of cross coupling and the sensitivity of hyperparameter selection and realize the gap-adaptive welding during the high frequency pulse arc welding process by implementing to optimize the number of trees and the minimum number of leaf nodes in the random forest model. After the optimal welding parameters are then used to train the random forest model, a gap-adaptive control platform, which take gap, weld face width, weld root width, and face reinforcement as input features and peak current, wire feed speed, and welding speed as output features, is established to enable real-time measure the gap by using a laser track sensor. The results demonstrate that under fixed and gradient gap conditions, the weld seam geometry is uniformly formed and no significant defects can be found. Under step gap conditions, gap-adaptive welding effectively prevents burn-through defects and ensures stable weld seam geometry. Furthermore, microstructural and mechanical property characterization indicates that an increase in frequency during welding effectively refines the grain size in the seam. The tensile strength values of the samples are similar and all samples fracture at the base metal.
Keyword ：
Arc welding Arc welding Gap-adaptive Gap-adaptive Machine learning Machine learning Stainless-steel Stainless-steel Thin plate Thin plate
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| GB/T 7714 | Mou, Gang , Zhang, Teng , Li, Fang et al. Research on gap-adaptive high frequency pulse arc welding of stainless-steel thin plate based on machine learning [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2025 , 141 : 1084-1097 . |
| MLA | Mou, Gang et al. "Research on gap-adaptive high frequency pulse arc welding of stainless-steel thin plate based on machine learning" . | JOURNAL OF MANUFACTURING PROCESSES 141 (2025) : 1084-1097 . |
| APA | Mou, Gang , Zhang, Teng , Li, Fang , Hua, Xueming , Xiang, Hongliang , Yang, Xu et al. Research on gap-adaptive high frequency pulse arc welding of stainless-steel thin plate based on machine learning . | JOURNAL OF MANUFACTURING PROCESSES , 2025 , 141 , 1084-1097 . |
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The heat accumulation and thermal cycle in the process of arc additive manufacturing had a serious impact on the forming quality, microstructure and mechanical properties of formed parts. In this study, a model for arc additive manufacturing of duplex stainless steel was established to analyze the evolution of temperature field under different deposition paths with or without cooling conditions. Under the condition of depositing four layers of metal, the end side of the first layer of metal deposited under the same directional deposition path and reciprocal deposition path had higher heat accumulation than the start side. Under the condition of cooling, the temperature drop at the midpoint of the first layer of deposited metal under the reciprocating path was greater than that of the same direction deposition path. The reciprocating deposition path and interlayer cooling method could significantly reduce the heat accumulation in the additive process and improve the forming quality of the deposited metal. The tensile strength and elongation of the deposited metal in the TD direction reached 761 MPa and 31.5%, respectively. The content of ferrite in the deposited metal under cooling condition was higher than that without cooling. The fracture mode of tensile samples with or without cooling in different deposition paths was ductile fracture.
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| GB/T 7714 | Xu, Wei , Zheng, Kaikui , Yao, Chuanxu . Numerical simulation of temperature field and microstructure of duplex stainless steel arc additive manufacturing process [J]. | JOURNAL OF MATERIALS SCIENCE , 2025 , 60 (27) : 11599-11615 . |
| MLA | Xu, Wei et al. "Numerical simulation of temperature field and microstructure of duplex stainless steel arc additive manufacturing process" . | JOURNAL OF MATERIALS SCIENCE 60 . 27 (2025) : 11599-11615 . |
| APA | Xu, Wei , Zheng, Kaikui , Yao, Chuanxu . Numerical simulation of temperature field and microstructure of duplex stainless steel arc additive manufacturing process . | JOURNAL OF MATERIALS SCIENCE , 2025 , 60 (27) , 11599-11615 . |
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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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Copper particles emitted from braking have become a significant source of environmental pollution. However, copper plays a crucial role in resin-based braking materials. Developing high-performance braking materials without copper has become a significant challenge. In this paper, the resin-based braking materials were filled with fly-ash cenospheres to develop copper-free braking materials. The effects of fly-ash cenospheres on the physical properties, mechanical and friction and wear properties of braking materials were studied. Furthermore, the wear mechanism of copper-free resin-based braking materials filled with fly-ash cenospheres was discussed. The results indicate that the inclusion of fly-ash cenospheres in the braking materials improved their thermal stability, hardness and impact strength, reduced their density, effectively increased the friction coefficient at medium and high temperatures, and enhanced the heat-fade resistance of the braking materials. The inclusion of fly-ash cenospheres contributed to the formation of surface friction film during the friction process of the braking materials, and facilitated the transition of form from abrasive wear to adhesive wear. At 100-350 celcius, the friction coefficient of the optimal formulation is in the range of 0.57-0.61, and the wear rate is in the range (0.29-0.65) x 10-7 cm3 center dot N-1 center dot m-1, demonstrating excellent resistance to heat-fade and stability in friction coefficient. This research proposes the use of fly-ash cenospheres as a substitute for environmentally harmful and expensive copper in brake materials, which not only improves the performance of braking materials but also reduces their costs.
Keyword ：
Braking materials Braking materials Fly-ash cenospheres Fly-ash cenospheres Friction and wear Friction and wear Heat-fade resistance Heat-fade resistance Wear form Wear form
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| GB/T 7714 | Zheng, Kaikui , Lin, Youxi , You, Shanmin et al. Copper-Free Resin-Based Braking Materials: A New Approach for Substituting Copper with Fly-Ash Cenospheres in Composites [J]. | CHINESE JOURNAL OF MECHANICAL ENGINEERING , 2024 , 37 (1) . |
| MLA | Zheng, Kaikui et al. "Copper-Free Resin-Based Braking Materials: A New Approach for Substituting Copper with Fly-Ash Cenospheres in Composites" . | CHINESE JOURNAL OF MECHANICAL ENGINEERING 37 . 1 (2024) . |
| APA | Zheng, Kaikui , Lin, Youxi , You, Shanmin , Ren, Zhiying , Huang, Jianmeng . Copper-Free Resin-Based Braking Materials: A New Approach for Substituting Copper with Fly-Ash Cenospheres in Composites . | CHINESE JOURNAL OF MECHANICAL ENGINEERING , 2024 , 37 (1) . |
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