两种UHMWPE／Kaolin复合材料在干摩擦条件下的滑动摩擦磨损性能研究

在ＭＭ－２００型磨损试验机上分别对以釜内聚合和熔融机械混合方法制备的高岭土填充超高分子量聚乙烯基复合材料（ＵＨＭＷＰＥ／Ｋａｏｌｉｎ）在干摩擦条件下与４５＾＃钢对摩时的摩擦磨损性能进行了研究，并用扫描电子显微镜和立体光学显微镜对其磨损表面进行了观察与分析，对材料的磨损机理进行了探讨。结果表明：引入适量的高岭土能明显降低ＵＨＭＷＰＥ的摩擦系数和磨损率，用釜内聚合方法制备的ＵＨＭＷＰＥ／Ｋａｏｌｉｎ复

A Study on Friction and Wear Properties of Two Kind UHMWPE/Kaolin Composites under Dry Sliding

Kaolin filled ultra high molecular weight polyethylene (UHMWPE) based composites (coded as UHMWPE/Kaolin) were prepared by polymerization filling and melt mixing, respectively. The friction and wear properties of the composites under dry sliding against AISI 1045 steel were evaluated with an MM 200 friction and wear tester. The morphologies of the worn composite surfaces and of the transfer films on the counterface steel were observed by means of scanning electron microscopy (SEM) and stereo optical microscopy. As the results, kaolin at a certain content is very effective to reduce the friction and wear of UHMWPE. UHMWPE/Kaolin composites prepared by polymerization filling are superior to the ones prepared by melt mixing with the same filler content in terms of friction reduction and reducing wear. The differences in the transfer film characteristics and the structure of UHMWPE account for the different friction and wear properties of the two kind composites.