利用高能离子注入及增强沉积系统对Ti6Al7Nb合金做了不同剂量的氮离子注入处理,采用球/平面接触模式,对Ti6Al7Nb合金及其离子注入层/Zr₂O球(直径为25.2 mm)接触副在小牛血清介质条件下进行了扭动微动磨损实验研究。结合动力学分析,借助X射线衍射仪(XRD)、三维形貌仪(3D-profiler)和扫描电镜(SEM)分析了测试材料成分及其扭动微动磨损磨痕形貌和微观组织结构,探讨了Ti6Al7Nb合金及其离子注入层的扭动微动运行行为和损伤机制。结果表明:N+离子注入在钛合金表面形成了氮化钛层,使钛合金表面的微观硬度明显提高,随着注入剂量的增加,钛合金的硬度逐渐升高,磨痕逐渐变小,磨粒逐渐变细,其抗扭动微动磨损性能也提高。

Ti6Al7Nb alloys were implanted with 40 keV N+ and different implanting dosage, using in high energy ion implantation and enhanced deposition system. The torsional fretting wears of an un-treated and an ion implantation nitride Ti6Al7Nb alloy flats against Zr₂O ball (with diameter of 25.2 mm) were carried out under a simulated physiological condition. Combined with the analyses of the frictional kinetics behaviours, and by means of X-ray diffraction, micro-hardness tester and SEM morphologies, the damage characteristics of the surface modification layer and its substrate were discussed in detail. The results show that the ion implantation nitride can improve the surface hardness of the alloy, its resistance of the torsional fretting wear is improved also.