超高分子量聚乙烯及其纳米Al_2O_3填充复合材料摩擦磨损性能研究

Friction and Wear Properties of Ultra-high-molecular-weight-polyethylene and Its Composites Filled With Nanocrystalline Al_2O_3

采用MM - 2 0 0型摩擦磨损试验机考察了载荷及对摩偶件表面SiC粒度对超高分子量聚乙烯及其纳米Al2 O3填充复合材料摩擦磨损性能的影响 ,利用扫描电子显微镜观察磨损表面形貌并分析了其磨损机理 .结果表明 :纳米Al2 O3 可以提高超高分子量聚乙烯的硬度及抗磨粒磨损性能 ;随着载荷的增大 ,超高分子量聚乙烯及纳米填充复合材料的磨损加剧 ;纳米Al2 O3 填充超高分子量聚乙烯复合材料的摩擦系数较超高分子量聚乙烯的略有增大 ;纳米Al2 O3 含量的增加有利于超高分子量聚乙烯复合材料抗磨粒磨损性能的提高 ;偶件表面喷涂SiC粒度的大小对超高分子量聚乙烯及其纳米Al2 O3

The friction and wear properties of Ultra-high-molecular-weight-polyethylene (UHMWPE) and its composites filled with nanocrystalline Al 2O 3 were investigated with an MM-200 friction and wear tester, with an emphasis on exploring the effect of load and the counterpart surface roughness (grit size of blast SiC) on the tribological behavior. The worn surfaces of UHMWPE and its composites were examined with a scanning electron microscope, as an attempt to examine the wear mechanism of the composites. It has been found that the addition of nanocrystalline Al 2O 3 increases the hardness, wear resistance, and the friction coefficient of UHMWPE in sliding against steel with or without blast SiC coating. Increased wear mass losses of UHMWPE and its composites are observed with increasing grit size of the blast SiC coating on the counterpart surface. UHMWPE and its composites are characterized by plastic deformation and abrasive wear in sliding against the SiC-blast-coating steel ring.