Tribological properties of polymers PI,PTFE and PEEK at cryogenic temperature in vacuum |
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| Affiliation: | 1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Laboratory for Tribology and Interface Nanotechnology, Faculty of Mechanical Engineering, University of Ljubljana, Bogi?i?eva 8, 1000 Ljubljana, Slovenia;2. Pladent d.o.o., Lokarje 19, 1217 Vodice, Slovenia;3. Department for Nanostructured Materials, Jo?ef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia;4. Jo?ef Stefan International Postgraduate School, Jamova cesta 39, 1000 Ljubljana, Slovenia;5. Department of Surface Engineering and Optoelectronics, Jo?ef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia;1. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Beijing Aerospace Control Instrument Research Institute, Beijing 100854, China;1. Ghent University, Laboratory Soete, Technologiepark, 9052 Zwijnaarde, Belgium;2. Lehrstuhl für Verbundwerkstoffe,University of Kaiserslautern, Kaiserslautern, Germany;1. Department of Mechanical Engineering, Texas A&M University, College Station, TX, USA;2. Department of Mechanical Engineering, Imperial College London, UK;3. Hoerbiger Corporation of America, Inc., Houston, TX, USA;1. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206W. Green Street, Urbana, IL 61801, USA;2. Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA |
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| Abstract: | 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 visco-elasticity of PI, PTFE and PEEK, the friction coefficients fall as the load increases. |
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| Keywords: | Friction and wear Cryogenic temperature Vacuum Polymers PI PTFE PEEK |
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