POLYMERS AND POLYMER MATRIX COMPOSITES |
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Effects of Load and Velocity on the Friction Properties of Polyether-Ether-Ketone Composites |
YUE Shiwei1,2, PANG Xianjuan1,2,*, NIU Yixu1,3, HUANG Suling1,2
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1 National Engineering Laboratory for Bearing Tribology, Henan University of Science and Technology, Luoyang 471023, Henan, China 2 School of Chemical and Pharmaceutical Sciences,Henan University of Science and Technology,Luoyang 471023, Henan, China 3 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, Henan, China |
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Abstract In this work, the composite material with polyether-ether-ketone as matrix and carbon fiber as reinforcement was used as the research object, and the surface was pretreated by grinding and polishing methods. The friction experiments of polyether-ether-ketone and its composites were carried out on a multifunctional friction and wear testing machine. The effects of load and velocity on the tribological property and wear mec-hanism of polyether-ether-ketone and its composites were systematically studied. The surface analysis and properties of the composites were measured by 3D morphometer, scanning electron microscope, X-ray diffractometer, infrared spectrometer and thermal conductivity analyzer. The results show that the crystallization state of PEEK and PEEK/CF is not changed in forming process, where PEEK does not undergo decomposition and cracking reaction, and CF does not undergo oxidation reaction. In the initial running stage, the friction coefficient increases with time and then gradually becomes stable. In stable stage, the friction coefficient of GCr15-PEEK friction pair is between 0.29—0.32 and that of GCr15-PEEK/CF friction pair is between 0.27—0.30. With the load increasing, the time of the friction coefficient to reach the stable stage becomes shorter. The wear mechanism of PEEK and PEEK/CF composite is mainly adhesive wear under light load conditions, which changes to adhesive wear and abrasive wear when the load reaches a certain value. With the velocity increasing, the wear rate of PEEK decreases firstly and then increases, and the wear mechanism of PEEK changes from adhesive wear to adhesive wear and abrasive wear. The wear rate of PEEK/CF composites decreases monotonically with velocity increasing, and the wear mechanism is mainly adhesive wear.
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Published: 25 August 2022
Online: 2022-08-29
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Fund:National Natural Science Foundation of China (U1404504, U1804252), the Natural Science Foundation of Henan Province (202300410141), the Key Scientific Research Projects of Higher Education Institutions of Henan Province (20A430009) and the Key Science and Technology Projects of Henan Province (182102210291). |
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