Abstract
Poly-ether-ether ketone (PEEK) is a great potential thermoplastic in industry and medical treatment and health. In this work, PEEK/graphene oxide (GO) and PEEK/MoS2 composites were prepared by a novel hot isostatic pressing method. The addition of GO alters the tribological behaviors mechanism; fatigue wear mechanism is predominant to PEEK/GO composites. However, the combination of abrasive and adhesive wear mechanisms is observed for PEEK/MoS2 composites and PEEK. The reason for this is that the hardness and tensile strength of composites are increased with the appropriate addition of GO. The response time to stable friction state of PEEK/GO and PEEK/MoS2 composites is reduced in comparison with PEEK, which is conducive to shorten running-in time, reduce the energy consumption, and improve the tribological performances of composites. The addition of GO and MoS2 can effectively decrease the friction coefficient and wear rate, and the optimal content of GO and MoS2 was 0.7 wt.% and 15 wt.%, respectively. The results indicate that PEEK/GO and PEEK/MoS2 are impressive composites that possess super tribological properties.
Highlights
Poly-ether-ether ketone (PEEK), first synthesized by Bonner in 1962, is an excellent aromatic semicrystalline thermoplastic engineering plastic
PEEK/graphene oxide (GO) and PEEK/MoS2 composites were successfully prepared via a novel hot isostatic press method
The mapping-mode energy dispersive spectrometry (EDS) shows that the MoS2 are evenly distributed in PEEK matrix
Summary
Poly-ether-ether ketone (PEEK), first synthesized by Bonner in 1962, is an excellent aromatic semicrystalline thermoplastic engineering plastic. PEEK possesses great mechanical properties [1,2], excellent chemical corrosion resistance, thermal stability and suitable tribological characteristics [3], high radiation resistance [4], good machinability, and electrical properties [5]. PEEK composites are selected in non-lubricated applications, which are required to withstand high loads and long working hours. PEEK exhibits a relatively high friction coefficient and low wear resistance, due to its stronger adhesion to counterpart materials, which makes it difficult to meet the operating requirements under harsh dry sliding contact conditions [1,6,8]. The properties of PEEK composites are affected by the preparation methods. Conventional methods include injection molding [9,10], compression molding [11,12], and extrusion [13,14]
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