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Purpose The purpose of this paper is to investigate the fretting wear performance of ultra-high-molecular-weight-polyethene (UHMWPE) with addition of GO and SiO2. Design/methodology/approach In this study, GO were synthesized and SiO2 nanoparticles were grafted onto GO. The effect of nanofiller on fretting wear performance of UHMWPE was investigated. Findings The results indicated that GO was successfully synthesized and SiO2 nanoparticles successfully grafted onto GO. Incorporation of GS was beneficial for the reduction in friction and the improvement in wear resistance of UHMWPE. GO was beneficial for reducing friction coefficient, while SiO2 was good for improving wear resistance. There existed a tribological synergistic effect between GO nanosheet and SiO2 nanoparticles. Research limitations/implications The hybrids of GS were promising nanofiller for improving the fretting wear performance of UHMWPE. Originality/value The main originality of the research is to reveal the effect of GO and SiO2 nanoparticles on fretting behavior of UHMWPE. The result indicated hybrids of GS were promising nanofiller for improving the fretting wear performance of UHMWPE.

Zeolitic imidazolate frameworks (denoted as ZIF8) were combined with carbon nanofiber (denoted as CNF) by a facile liquid-phase chemical route to afford ZIF8-CNF nano-hybrid as the filler of ultra-high-molecular-weight-polyethylene (abridged as UHMWPE). The as-prepared ZIF8-CNF nano-filler was incorporated into UHMWPE matrix via hot pressing to obtain the UHMWPE-matrix composite. The effects of CNF, ZIF8, and ZIF8-CNF on the thermal stability, mechanical properties, and fretting wear behavior of UHMWPE were comparatively investigated based on thermogravimetric analysis-differential scanning calorimetry, scanning electron microscopy, X-ray diffraction, and stress-strain testing. Findings indicate that ZIF8-CNF can significantly promote the crystallization of UHMWPE and improve its thermal stability and mechanical properties. Besides, the high interfacial strength between the ZIF8-CNF nano-filler and UHMWPE matrix is favorable for facilitating the transfer of load from the polymer matrix to the inorganic filler and for the formation of transfer film on worn steel surface, thereby alleviating adhesion, abrasion, and plastic deformation. Therefore, the ZIF8-CNF/UHMWPE composite exhibits much better fretting wear resistance than neat UHMWPE, CNF/UHMWPE composite, and ZIF8/ UHMWPE composite.