中文摘要：

以纳米SiO2作为填料制备UHMWPE／纳米SiO2复合材料，采用MRH-5A型摩擦磨损试验机研究纳米含量与载荷等因素对复合材料摩擦磨损性能的影响；利用扫描电子显微镜观察复合材料磨损表面形貌并分析其磨损机理。结果表明，填充纳米SiO2，UHMWPE的摩擦系数减小约40％；SiO2含量为10％左右时，复合材料的摩擦系数最小，磨损性能最好；随着载荷的增大，复合材料的摩擦系数随之增大，尔后趋于平稳；复合材料磨损量随着载荷的增大而增加；摩擦过程中存在短暂的摩擦跑合期。纯UHM—WPE的磨损机理是粘附，而复合材料的磨损机理主要表现为疲劳剥层。

英文摘要：

Nanocomposites of UHMWPE/SiO2 are prepared by filling nano-scale SiO2 in UHMWPE （Ultra-high molecular weight polyethylene）. The friction and wear properties and the effect of content of nanometer SiO2 and load on the tribological characteristics of composite materials are investigated on MRH-5A friction and wear instrument. The worn surface of UHMWPE/SiO2composites is examined on a scanning electron microscope （SEM）. It is found that the filling of nano-scale SiP2 can decrease the friction coefficient and increase the wear properties. When the content of SiO2 is about 10%, the friction coefficient and wear rate of composite is minimal ; at first ,The friction coefficient of UHMWPE/SiO2 composite increases with the load increasing, and then it became stable, the friction process of UHMWPE/SiO2 materials exists a running-in period. The main wear mechanism of UHMWPE is adhesion , while the wear mechanism of composite is shifted to fatigue rupture.