Correlation of the tribological behaviors with the mechanical properties of poly-ether-ether-ketones (PEEKs) with different molecular weights and their fiber filled composites |
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| Authors: | G Zhang AK Schlarb |
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| Affiliation: | 1. Laboratório de Materiais, Departamento de Engenharia Mecânica Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil;2. Whirlpool - Embraco, Joinville, SC, Brazil;1. The State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. EPSRC Centre for Innovative Manufacturing in Advanced Metrology, University of Huddersfield, Huddersfield HD1 3DH, UK;1. Dipartimento di Chimica, Universita degli Studi di Torino, via P. Giuria 7, 10125 Torino, Italy;2. Dipartimento di Scienze e Tecnologie Chimiche, Universita degli Studi di Udine, via Cotonificio 108, 33100 Udine, Italy;1. Ghent University, Laboratory Soete, Technologiepark, 9052 Zwijnaarde, Belgium;2. Lehrstuhl für Verbundwerkstoffe,University of Kaiserslautern, Kaiserslautern, Germany;1. Division of Machine Elements, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå, Sweden;2. Institute for Composite Materials (IVW GmbH), Technical University of Kaiserslautern, Erwin Schrödinger Straße Geb. 58, 67663 Kaiserslautern, Germany;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;3. Qingdao Center of Resource Chemistry & New Materials, Qingdao 266071, China |
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| Abstract: | The tribological behaviors of three poly-ether-ether-ketones (PEEKs) with different molecular weights and their SCF (short carbon fiber)/graphite/PTFE (polytetrafluoroethylene) filled composites were examined using a block-on-ring apparatus under dry sliding conditions. Tensile tests, hardness measurements and dynamic mechanical thermal analysis (DMTA) of the PEEK based materials were also performed. The tribological behaviors of PEEK based materials were correlated with their mechanical properties and the tribological mechanisms were discussed based on scanning electron microscope (SEM) inspections of worn surfaces and wear debris. Under a low apparent pressure, a high material ductility seems to reduce the wear rate of pure PEEK through alleviating the microcutting effect exerted by the protruding regions of the counterpart. Under a high pressure, however, a high stiffness seems to improve the wear resistance of pure PEEK by reducing the plastic flow occurring in the PEEK surface layer. After incorporating SCF/graphite/PTFE fillers, the wear rate of PEEK was decreased significantly. Thinning and cracking of SCF are supposed to be the important factors determining the tribological behaviors of the composites. |
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