中文摘要：

采用低压高频脉冲等离子体浸没离子注入与氮化技术对CoCrMo合金进行氮离子注入及氮化处理,在25%的小牛血清溶液中,利用往复式摩擦磨损实验机评价CoCrMo合金氮化处理后表面粗糙度对超高分子量聚乙烯（UHMWPE）摩擦磨损性能的影响。研究结果表明,CoCrMo合金氮化处理后表面粗糙度较小（Ra=0.0176μm）时,超高分子量聚乙烯主要磨损机制为粘着磨损;CoCrMo合金氮化处理后表面粗糙度较大（Ra=0.1529μm）时,超高分子量聚乙烯的磨损以磨粒磨损为主,在这两种情况下,UHMWPE磨损率较高。而当改性CoCrMo合金表面粗糙度为Ra=0.1145μm时,UHMWPE的磨屑可能转移到对偶件表面,并起一定的隔离和润滑作用,有效地削弱粗糙峰的切削作用,使得UHMWPE的磨损率最低。

英文摘要：

CoCrMo alloy was modified by high frequency and low voltage plasma immersion and ion implantation （HLPIII） nitriding at different parameters. Wear test was carried out on reciprocating wear test machine in 25% of fetal calf serum solution to study the effect of modified CoCrMo alloy surface roughness on the friction and wear properties of Ultra-high molecular weight polyethylene （UHMWPE）. The results revealed that the main wear mechanism of UHMWPE was adhesive wear for lower modified CoCrMo alloy surface roughness（Ra=0.0176μm）. And abrasive wear was dominated for higher modified CoCrMo alloy surface roughness （Ra=0.1529μm）. In both cases,UHMWPE wear rates were relatively high. However,when modified CoCrMo alloy Ra was 0.1145μm,UHMWPE wear debris may be transferred to the friction surface,and this effectively weaken the role of rough cutting peaks. And it has the lowest wear rate of UHMWPE for modified CoCrMo alloy with 0.1145μm surface roughness.