聚丙烯和二硫化钼对超高分子量聚乙烯复合材料摩擦磨损性能的影响

采用模压法制备了聚丙烯(PP)和MoS2填充超高分子量聚乙烯(UHMWPE)复合材料;在MM-200型摩擦磨损试验机上考察了UHMWPE/PP/MoS2复合材料的摩擦磨损性能;采用扫描电子显微镜观察分析复合材料磨损表面形貌.结果表明:单独添加MoS2可以提高UHMWPE的抗磨性能,但摩擦系数增大、力学性能降低;而采用PP和MoS2对UHMWPE进行改性可以显著改善加工性能;72.7%UHMWPE/18.2%PP/9.1%MoS2三元复合材料的加工性能、承载能力和长时抗磨性能明显优于UHMWPE;UHMWPE主要发生粘着磨损和疲劳磨损;而72.7%UHMW-PE/18.2%PP/9.1%MoS2三元复合材料在相同试验条件下同钢对摩时仅发生轻微塑性变形.

Effect of Polypropylene and Molybdenum Disulfide on Friction and Wear Behavior of Ultra High Molecular Weight Polyethylene

The ultra-high molecular weight polyethylene (UHMWPE) composites filled with polypropylene (PP) and MoS_2 of different compositions were prepared by compression molding at elevated temperature. The friction and wear behaviors of the composites sliding against AISI-1045 steel were evaluated on an MM-200 friction and wear tester in a ring-on-block configuration. The morphologies of the worn surfaces of the UHMWPE and its composites were observed on a scanning electron microscope. It was found that the incorporation of PP was beneficial to improving the processing performance of UHMWPE. The tertiary composite 72.7%UHMWPE/18.2%PP/9.1%MoS_2 showed and much better anti-fatigue ability mechanical properties comparable to those of the UHMWPE. The UHMWPE was characterized by severe adhesion and fatigue as it slid against the steel for an extended duration, while the tertiary composite by mild plastic deformation. This was supposed to be related to the enrichment and film-formation of the peeled off MoS_2 on the worn surface of the composite block or the counterpart steel ring.