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Environmental dependence of ultra-low wear behavior of polytetrafluoroethylene (PTFE) and alumina composites suggests tribochemical mechanisms
Affiliation:1. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA;2. DuPont Nanocomposite Technologies, Wilmington, DE 19803, USA;3. DuPont Central Research and Development, Wilmington, DE 19803, USA;1. Metal Polymer Research Institute of the National Academy of Sciences of Belarus, 32a Kirov Street, Gomel 246050, Belarus;2. A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Street, 28, Moscow 119991, Russia;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. Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA 18015, United States;2. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, United States;3. Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, United States;4. DuPont Central Research and Development, 200 Powder Mill Road, PO Box 8352, Wilmington, DE 19803, United States;1. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China;2. Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing, Yanshan University, Qinhuangdao 066004, China
Abstract:Composites of polytetrafluoroethylene (PTFE) and alpha phase alumina produce wear rates that can be nearly five orders of magnitude less than the wear rates of virgin PTFE. The mechanism for this reduction in wear cannot be explained solely by mechanical effects. The influences of oxygen and humidity on the tribological performance of both unfilled PTFE and PTFE/alumina composites were studied. The wear rate of PTFE/alumina composites is dependent on the humidity of the environment; this dependence suggests a tribochemical mechanism is responsible for the ultra-low wear behavior of these PTFE/alumina composites.
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