中国物理B ›› 2022, Vol. 31 ›› Issue (6): 66201-066201.doi: 10.1088/1674-1056/ac4f5a

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Vacuum current-carrying tribological behavior of MoS2-Ti films with different conductivities

Lu-Lu Pei(裴露露)1,2, Peng-Fei Ju(鞠鹏飞)3, Li Ji(吉利)1,†, Hong-Xuan Li(李红轩)1,‡, Xiao-Hong Liu(刘晓红)1, Hui-Di Zhou(周惠娣)1, and Jian-Min Chen(陈建敏)1   

  1. 1 Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
    2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Shanghai Aerospace Equipment Manufacture, Shanghai 200245, China
  • 收稿日期:2021-12-21 修回日期:2022-01-21 接受日期:2022-01-27 出版日期:2022-05-17 发布日期:2022-05-19
  • 通讯作者: Li Ji, Hong-Xuan Li E-mail:jili@licp.cas.cn;lihx@licp.cas.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51775537) and Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. Y202084).

Vacuum current-carrying tribological behavior of MoS2-Ti films with different conductivities

Lu-Lu Pei(裴露露)1,2, Peng-Fei Ju(鞠鹏飞)3, Li Ji(吉利)1,†, Hong-Xuan Li(李红轩)1,‡, Xiao-Hong Liu(刘晓红)1, Hui-Di Zhou(周惠娣)1, and Jian-Min Chen(陈建敏)1   

  1. 1 Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
    2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Shanghai Aerospace Equipment Manufacture, Shanghai 200245, China
  • Received:2021-12-21 Revised:2022-01-21 Accepted:2022-01-27 Online:2022-05-17 Published:2022-05-19
  • Contact: Li Ji, Hong-Xuan Li E-mail:jili@licp.cas.cn;lihx@licp.cas.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51775537) and Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. Y202084).

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摘要： Current-carrying sliding is widely applied in aerospace equipment, but it is limited by the poor lubricity of the present materials and the unclear tribological mechanism. This study demonstrated the potential of MoS2-based materials with excellent lubricity as space sliding electrical contact materials by doping Ti to improve its conductivity. The tribological behavior of MoS2-Ti films under current-carrying sliding in vacuum was studied by establishing a simulation evaluating device. Moreover, the noncurrent-carrying sliding and static current-carrying experiments in vacuum were carried out for comparison to understand the tribological mechanism. In addition to mechanical wear, the current-induced arc erosion and thermal effect take important roles in accelerating the wear. Arc erosion is caused by the accumulation of electric charge, which is related to the conductivity of the film. While the current-thermal effect softens the film, causing strong adhesive wear, and good conductivity and the large contact area are beneficial for minimizing the thermal effect. So the moderate hardness and good conductivity of MoS2-Ti film contribute to its excellent current-carrying tribological behavior in vacuum, showing a significant advantage compared with the traditional ones.

关键词: MoS2-Ti films, conductivity, current-carrying tribological behavior, vacuum

Abstract: Current-carrying sliding is widely applied in aerospace equipment, but it is limited by the poor lubricity of the present materials and the unclear tribological mechanism. This study demonstrated the potential of MoS2-based materials with excellent lubricity as space sliding electrical contact materials by doping Ti to improve its conductivity. The tribological behavior of MoS2-Ti films under current-carrying sliding in vacuum was studied by establishing a simulation evaluating device. Moreover, the noncurrent-carrying sliding and static current-carrying experiments in vacuum were carried out for comparison to understand the tribological mechanism. In addition to mechanical wear, the current-induced arc erosion and thermal effect take important roles in accelerating the wear. Arc erosion is caused by the accumulation of electric charge, which is related to the conductivity of the film. While the current-thermal effect softens the film, causing strong adhesive wear, and good conductivity and the large contact area are beneficial for minimizing the thermal effect. So the moderate hardness and good conductivity of MoS2-Ti film contribute to its excellent current-carrying tribological behavior in vacuum, showing a significant advantage compared with the traditional ones.

Key words: MoS2-Ti films, conductivity, current-carrying tribological behavior, vacuum

中图分类号:  (Friction, tribology, and hardness)

  • 62.20.Qp
81.15.Cd (Deposition by sputtering)