Ultra high molecular weight polyethylene (UHMWPE) based composites filled with nanometer SiO2, nanometer montmorillonite (MMT) and polytetrafluoroethylene (PTFE) were prepared by heat compression molding. The friction and wear behaviors of the composites sliding against AISI-10 45 carbon steel disc under dry ambient condition were evaluated on a pin-on-disc test rig. The worn surfaces of the composites were observed on a scanning electron microscope. The results show that when the mass fractions of PTFE and nanometer MMT both are fixed at 6％, the composites with 2％ nano-SiO2 obtain better wear-resisting property, and the main wear mechanism is adhesive wear. There are four obvious characteristics which are primary running in period, primary steady period, second running in period and second steady period during the friction process of the composites without nano-SiO2. With the increase of the mass fraction of nano-SiO2 in the compounded fillers, the friction process characteristics of the composites present complicated variation law, and main wear mechanisms are characterized by adhesive wear and abrasive wear in varying degrees, and the wear-resisting property of the composites is obviously deteriorated.%通过热压成型工艺制备纳米SiO2和纳米蒙脱土(MMT)及聚四氟乙烯(PTFE)复合填充超高分子量聚乙烯(UHMWPE)复合材料,采用销-盘式摩擦磨损试验机考察复合材料在干摩擦条件下与45#钢配副时的摩擦磨损行为,用扫描电子显微镜观察复合材料的磨损表面形貌.结果表明:当PTFE和MMT的填充质量分数均保持6%,填充质量分数为2%的纳米SiO2时复合材料可获得较好的耐磨性能,其磨损机制主要表现为黏着磨损;不含纳米SiO2的复合材料的摩擦行为主要表现为一次磨合期和一次稳定期以及二次磨合期和二次稳定期4个明显的特征;随着填充纳米SiO2质最分数的增加,复合材料的摩擦过程呈现出复杂的变化规律,其磨损机制主要表现为不同程度的黏着磨损和磨粒磨损,且耐磨性能呈现出明显的恶化现象.
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