期刊
CRYOGENICS
卷 75, 期 -, 页码 19-25出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cryogenics.2016.01.001
关键词
Friction and wear; Cryogenic temperature; Vacuum; Polymers PI, PTFE, PEEK
资金
- National Key Basic Research Program of China (973 Program) [2015CB057502]
- National Defense Innovation Fund of Chinese Academy of Sciences [CXJJ-14-M43]
The effects of temperature, sliding speed and load on the tribological properties of polyimide (PI), polytetrafluoroethylene (PTFE) and polyetheretherketone (PEEK) at cryogenic temperature in vacuum were investigated using a ball-on-disk tribometer. At cryogenic temperature, polymers show higher hardness which results in decreasing contact area between the friction pairs. Moreover, the real surface area in contact between steel ball and polymer disk determines the friction coefficient instead of the formation and adhesion of the transfer film. Thus, the friction coefficients at cryogenic temperatures are lower than at room temperature. On the other hand, wear rates of the three polymers decrease as temperature decreases since molecular mobility and migration are limited at cryogenic temperatures. For the viscoelasticity of PI, PTFE and PEEK, the friction coefficients fall as the load increases. (C) 2016 Elsevier Ltd. All rights reserved.
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