纳米氧化锌填充超高分子量聚乙烯复合材料的摩擦磨损性能研究

Friction and Wear Behavior of Nano-ZnO Filled UHMWPE Composites

采用热压成型工艺制备了纳米ZnO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了纳米粒子对复合材料摩擦磨损性能的影响；采用扫描电子显微镜观察复合材料磨损表面形貌．结果表明：填充15％～20％的纳米ZnO可以显著改善UHMWPE的摩擦磨损性能；复合材料的磨损机理随纳米粒子含量的增加而变化，纯UHMWPE的磨损机理主要为粘着磨损和疲劳磨损，随着复合材料中纳米粒子含量增加，疲劳磨损特征逐渐消失，当其纳米粒子含量大于15％时，其磨损机理主要为粘着磨损；复合材料磨损表面出现了贫ZnO区和富ZnO区，且富ZnO区以“岛”的形式分布在贫ZnO区中．

Ultra high molecular weight polyethylene （UHMWPE） based composites filled with nanometer ZnO were prepared by heat compression molding. The influence of nano-particulates on the friction and wear behavior of the composites were investigated on a pin-on-disc test rig. The worn surfaces of the composites were observed on a scanning electron microscope. It was found that the friction and wear properties of the composites filled with 15% - 20% nano-ZnO were improved remarkably. Wear mechanisms of the composites varied with the amount of nano-particulates. The wear mechanisms of pure UHMWPE were adhesive wear and fatigue wear. Characteristics of fatigue wear disappeared gradually with the increase of mass fraction of nano-ZnO. When the fraction exceeds 15%, main wear mechanism was adhesive wear. There were two zones on the wear surfaces, one was lack of ZnO, the other was abundant in ZnO, and the latter distributed in the zone lack of ZnO in the form of islands.