A comparative investigation of the wear behavior of PTFE and PI under dry sliding and simulated sand-dust conditions |
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| Authors: | Chunxia Li Fengyuan Yan |
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| Affiliation: | 1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;2. Graduate School of Chinese Academy of Sciences, Beijing 100864, PR China;1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China;2. System Engineering Institute of Sichuan Aerospace, Chengdu 610100, China;3. Department of Chemical and Biochemical Engineering, Faculty of Engineering, University of Western Ontario, London, Ontario N6A 5B9, Canada;1. Mechanical Engineering Department, Texas A&M University, College Station, TX, USA;2. Mechanical Engineering Department, Khalifa University of Science, Technology and Research, P.O. Box 127788, Abu Dhabi, United Arab Emirates;1. Centre for Advanced Materials Technology, School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW, 2006, Australia;2. The King Abdulaziz City for Science and Technology, The National Centre for Building and Construction Technology, P O Box 6086, Riyadh, 11442, Saudi Arabia |
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| Abstract: | The wear behavior of polytetrafluoroethylene (PTFE) and polyimide (PI) has been comparatively evaluated under dry sliding and simulated sand-dust conditions. An improved block-on-ring wear tester equipped with an attachment for simulating the sand-dust environment was used to evaluate the abrasive wear behavior of materials. The sand collected from the Yellow River of China was used to simulate the sand-dust environment, also different loads and sand-dust sizes were chosen for tribological tests. The two chosen polymers showed different wear behavior under sand-dust conditions and the wear rates of PTFE were much lower under sand-dust conditions than under dry sliding conditions. This was attributed to the formation of the tribolayer on the worn surfaces during the abrasive wear process. The sand-dust enhanced the wear resistance of PTFE, but reduced that of PI because, in contrast to PTFE, there was no tribolayer formed on the PI worn surface. The wear rate of PTFE increased under sand-dust conditions while the wear rate of PI decreased with the increase of applied load. The higher hardness of PI and fragmentation of abrasive particles under high loads accounted for the decrease in wear rate as load increased. |
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