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.
Five kinds of silicates (attapulgite, kaolin, montnorillonite, synthetic mica, and talc) reinforced ultra‐high molecular weight polyethylene (UHMWPE) composites were prepared. The fretting performance of the composites was investigated using an oscillating reciprocating friction and wear tester in a ball‐on‐plate mode. The thermodynamic property and crystallinity of the composites were evaluated, and the worn morphology was also observed. Result shows that the heat‐resistance and the crystallinity of the composites are generally improved. The friction coefficient and mass loss of the composites reduced than those of the neat UHMWPE. Thereinto, the attapulgite/UHMWPE composite shows the best fretting resistance performance. The heat resistance of composites increases due to the reinforcement of silicates. Meantime, the friction load can be distributed by the filler in the matrix. Moreover, the different fretting resistance performance of the composites is due to the different dispersion degree and the interfacial bonding force between the fillers and the UHMWPE matrix.
The attapulgite nanofibers (ATP) were grafted on the surface of carbon fibers (CF) by polyetherimide (PEI) with long chain to reinforce the thermal, mechanical properties, and fretting wear resistance of ultra‐high molecular weight polyethylene. The results showed that the surface roughness of CF modified by ATP nanofibers were highly increased. Meanwhile, the thermal, mechanical, and tribological properties of the ATP‐PEI‐CF/UPE composite were significantly improved, especially the enhancement in heat distortion temperature, compressive modulus, and wear resistance. The improvement mechanisms of the corresponding properties were mainly attributed to the increase of mechanical interlocking of the matrix and the hybrid fillers, which could not only transfer the load and heat applied to the matrix to the fibers, but also impede the friction damage of the matrix during fretting wear process.
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