Hank’s模拟体液中Ti-25Nb-3Mo-3Zr-2Sn与Ti-2.5Al-3Mo-2.5Zr合金的微磨损行为

Micro-scale wear behavior of biomedical material Ti-3Zr-2Sn-3Mo-25Nb and Ti-2.5Al-3Mo-2.5Zr alloy in hank's solution

采用TE66微磨粒磨损设备对医用Ti-25Nb-3Mo-3Zr-2Sn(TLM)和Ti-2.5Al-3Mo-2.5Zr(TAMZ)钛合金在Hank’s模拟人体体液中的微磨损行为进行研究;考虑到载荷及磨粒浓度的影响,通过观察磨斑形貌建立合金磨损机制图,并结合磨损体积建立材料优选图。结果表明:载荷增加致使单个磨粒所承受应力增加,导致合金磨损体积随载荷增加而增加;合金磨损体积亦随磨粒浓度增加而增加;TLM合金中含有细小α_s相致使其磨损体积较小。合金的摩擦因数均随载荷增加而增加,随磨粒浓度增加而降低,同等条件下TAMZ合金的摩擦因数要大。本实验条件下TLM合金的耐微磨损性能优于TAMZ合金的。磨损后TLM合金所呈现出来的磨损机制为二体和混合磨损机制,而TAMZ合金则呈二体、混合和三体磨损机制。TLM合金在本实验条件下可选择的范围比TAMZ的大。

The micro-scale wear behaviors of biomedical titanium alloys Ti-3Zr-2Sn-3Mo-25Nb（TLM） and Ti-2.5Al-3Mo-2.5Zr（TAMZ） in Hank＇s solution were studied by using the TE66 machine. The load and abrasive concentration were considered. The results show that the wear volumes of the two alloys increase with increasing load and abrasive concentration. The wear volume of TAMZ alloy is bigger. The friction coefficients of the two alloys increase with increasing load and decrease with increasing abrasive concentration, and the friction coefficient of TLM alloy is lower. Through observation the wear scar of the two alloys, the TLM alloy presents two-body wear and mixed-wear mechanism, the TAMZ alloy presents two-body, mixed and three-body wear mechanism. From the map of selected material, the chosen field of the TLM alloy is broader than that of the TAMZ alloy.