Abstract

This study was to determine to what extent a cryogenic surface treatment technique could improve the wear resistance of a Co-Cr-Mo hip implant material. Dry and cryogenic treatments were used to create different surface and sub-surface conditions. The Co-Cr-Mo samples were wear-tested using a pin-on-disk tester in a simulated implant environment. A change in the wear response was found as a function of the material surface properties. Correlation between the treatment conditions and wear volume loss was discussed. Sample from cryogenic treatment was found to be most promising with lower wear volume due to microstructure refinement, compressive residual stresses and preferred hcp phase; moreover, the preferred hcp phase revealed to be the most influencing property in enhancing the wear resistance.

摘要

这项研究旨在确定低温表面处理技术可以在多大程度上改善Co-Cr-Mo髋关节植入物材料的耐磨性。干式和低温处理用于创建不同的表面和亚表面条件。该钴铬钼使用销盘测试仪在模拟的植入环境中对样品进行磨损测试。发现磨损响应的变化是材料表面性能的函数。讨论了处理条件与磨损量损失之间的相关性。由于微结构的细化，压缩残余应力和优选的hcp相，发现低温处理的样品具有较低的磨损量是最有前途的。此外，在增强耐磨性方面，优选的hcp相显示出是最具影响力的性能。