材料期刊网

通过往复摩擦试验与电化学腐蚀试验，对新型人工关节替代材料TC20钛合金的相关性能展开研究，合理评价其作为关节替代材料的适用性及可靠性。研究结果表明， TC20钛合金在干摩擦条件下摩擦系数达到稳定的时间最长，且稳定后摩擦系数受外加载荷的影响最大；在小牛血清溶液中的摩擦系数最小，稳定后保持在0．33左右波动；干摩擦条件下的磨损最为剧烈，磨痕主要以犁沟形貌为主，磨损机理主要以粘着磨损及磨粒磨损为主，在较大载荷作用下开始出现疲劳磨损形貌；溶液中的磨损主要以粘着磨损为主，相同法向载荷下，生理盐水中的磨损更为剧烈；另外， TC20钛合金在两种溶液中的初始耐蚀性相差不大，但在生理盐水中，其表面能够在短时间内形成一层可有效保护基体的氧化膜。

Reciprocating friction test and electrochemical corrosion test of TC20(Ti6Al7Nb) titanium alloy were carried out to evaluate the applicability and reliability of TC20 titanium alloy as a new type artificial joint replacement material in this paper. The results show that the friction coefficient of TC20 titanium alloy in the dry friction condition takes the longest time to reach stability, and the influence of applied load on the stable friction coefficient in this condition is the highest. The friction coefficient in calf serum solution under different normal loads is the smallest, which fluctuates around 0. 33 when it reaches stability. The wear under dry friction is the most dramatic, and the wear scar is mainly the furrow morphology, the main mechanism of wear is adhesive wear and abrasive wear. The mechanism of wear in solutions is mainly adhesive wear, and the wear in saline solution under the same loading condition is more intense. In addition, the initial corrosion resistance of TC20 titanium alloy in the two solutions are similar, and there is an oxide film formed on the surface of TC20 titanium alloy in normal saline, which can effectively protect the matrix.