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以钛合金为基底,采用等离子喷涂技术制备含30wt%ZrO_2的羟基磷灰石(HA)生物陶瓷复合涂层。观察了HA/ZrO_2复合涂层的微观形貌,采用UMT-3销盘摩擦试验机重点研究了在牛血清润滑环境中,该复合涂层在不同载荷和转速下的磨损性能,观察涂层磨损表面形貌,分析其磨损机理。结果表明:HA30涂层微观表面覆盖着针片状晶粒,结构致密、均匀。截面以无规则细小的气孔为主,并且ZrO_2中间过渡层分别与HA30涂层、基体的结合界面均实现良好的机械咬合。随着施加载荷的增大,HA30复合涂层的摩擦系数和摩损率都升高,磨损机理由微观剥落转化为剥落磨损。随着销盘转速的增加,涂层的摩擦系数减小,磨损率则是先减小后增加,涂层裂纹萌生、扩展直至最终形成凹坑。
A hydroxyapatite (HA) bioceramic composite coating containing 30 wt% ZrO 2 was prepared by plasma spray technique on the basis of titanium alloy. The microstructure of HA / ZrO 2 composite coating was observed. The abrasion performance of HA / ZrO 2 composite coating under different load and rotation speed was studied by UMT-3 pin-on-disk tribometer. Surface morphology, analysis of its wear mechanism. The results show that the micro-surface of HA30 coating is covered with needle-like grains, which is compact and uniform. The sections are dominated by irregular small pores, and the intermediate interface of ZrO_2 and HA30 coating and matrix respectively achieve good mechanical bite. With the increase of applied load, the friction coefficient and the wear rate of HA30 composite coating increase, and the wear mechanism changes from micro-peeling to exfoliation wear. With the increase of pin speed, the coefficient of friction of the coating decreases, the wear rate decreases first and then increases, and the coating crack initiates and expands until the final pits are formed.