碳黑填充超高分子量聚乙烯复合材料摩擦磨损性能研究

采用MM-200型摩擦磨损试验机考察了载荷及偶件表面粗糙度对碳黑填充超高分子量聚乙烯(UHMWPE)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了其磨损机理．结果表明：同UHMWPE相比，碳黑填充UHMWPE的磨损质量损失随载荷增加而增大的幅度较小；偶件表面粗糙度对碳黑填充UHMWPE复合材料的摩擦磨损性能影响较大，随着偶件表面粗糙度的增大，摩擦系数和复合材料的磨损质量损失均显著增大．UHMWPE及其碳黑填充复合材料在干摩擦条件下同45“钢及SiC喷涂层涂覆45“钢对摩时主要呈现犁削和塑性变形特征，犁削和塑性变形程度随载荷和偶件表面粗糙度增加而加剧。

Friction and Wear Properties of Carbon Black Filled Ultrahigh Molecular Weight Polyethylene Composite

The friction and wear properties of UHMWPE and its composite filled with carbon black sliding against AISI-1045 steel in a block-on-ring configuration were investigated on an MM-200 friction and wear tester, with the effect of load and counterpart surface roughness on the tribological behavior to be focused on. The worn surfaces of UHMWPE and its composite were examined on a scanning electron microscope (SEM). It was found that the addition of the carbon black contributed to increase the wear resistance of UHMWPE, which was attributed to the load-carrying action of the carbon black particulates as the filler. The counterpart surface roughness had a great influence on the tribological behavior of the carbon black filled UHMWPE composite, and the wear mass loss of the composite considerably increased with increasing load and counterpart surface roughness as well, which was attributed to the enhanced ploughing and cutting action of the hard asperities on the counterpart surface of a larger surface roughness at increased normal load. UHMWPE and carbon black filled UHMWPE composite were characterized by ploughing and plastic deformation as they slid against the steel counterpart under unlubricated condition. The incorporation of the carbon black contributed to abate the ploughing and plastic deformation of the filled composite, which conformed to the better wear-resistance of the filled composite than the polymer matrix.