钛合金表面类金刚石碳梯度薄膜的摩擦磨损性能研究

Friction and Wear Behavior of DLC Gradient Film on Ti6Al4V Alloy Substrate in Sliding Against Ultra-high Molecular Weight Polyethylene

与 Ti6 Al4V合金 /超高分子量聚乙烯摩擦副对比 ,考察了 Ti6 Al4V合金表面类金刚石碳梯度薄膜 /超高分子量聚乙烯摩擦副在干摩擦以及 Hank's溶液和生理盐水润滑下的摩擦磨损性能 .采用扫描电子显微镜观察试样磨损表面形貌 ,并进而分析磨损机理 .结果表明 ,类金刚石碳梯度薄膜具有良好的减摩抗磨性能 ,其体积磨损率约为相同条件下Ti6 Al4V合金体积磨损率的 5 0 % ,相应的超高分子量聚乙烯偶件的磨损率亦较低 .类金刚石碳梯度薄膜的磨损呈现轻微磨粒磨损特征 。

The friction and wear behavior of diamond-like carbon (DLC) gradient film on Ti6Al4V alloy substrate in sliding against ultrahigh molecular weight polyethylene was investigated under dry sliding and lubrication of Hank's solution and 0.9% NaCl solution, by comparing with that of Ti6Al4V alloy against the same counterpart under the same testing conditions. The worn surfaces of the tested samples were observed with scanning electron microscopy in order to analyze the wear mechanisms. It is found that the DLC gradient film has the better friction-reduction and wear-resistant behavior in sliding against the polymer counterpart. Especially, a lower wear rate was also registered for the polymer counterpart, as compared with that of Ti6Al4V alloy. The wear of the diamond-like-carbon gradient film is characterized by slight abrasive wear, which is able to be refrained by the polymer counterpart.