CHA/ UHMWPE复合关节材料的生物摩擦学研究

采用热压成型工艺制备了超高分子量聚乙烯 (U HMWPE) /珊瑚羟基磷灰石 (CHA) 复合关节材料 , 利用人工髋关节模拟磨损试验系统 , 研究了该类复合材料与 CoCrMo 合金组合关节在小牛关节液润滑条件下的摩擦磨损性能。实验结果表明 , 添加 CHA 能有效提高 U HMWPE关节材料的表面硬度 , 降低其磨损率。当CHA添加量为 20 wt %时 , 可获得表面硬度与抗磨损性能的良好匹配。小牛关节液润滑条件下 , U HMWPE及其复合材料的磨损机理主要表现为研磨磨损和疲劳磨损 , 磨损颗粒尺寸随 CHA粉体添加量的增加而增大。 

Biotribological behavior of ultra high molecular weight polyethylene composites containing coralline hydroxyapatite in a hip joint simulator

The artificial joint material of U HMWPE composite reinforced with coralline hydroxyapatite (CHA) in different content s was prepared by the pressing formation method. A hip joint wear simulator was used to investigate the biot ribological behavior of a CHA/ U HMWPE acetabular cup against a CoCrMo alloy femoral head in calf bovine synovia lubrication at 35 ℃±1 ℃. The experimental result s indicate that the addition of CHA powders to U HMWPE enhances the hardness of the composites , and decreases the wear rates under calf bovine synovia lubrication. When the addition of CHA powders is up to 20 wt % , CHA/ U HMWPE composites demonst rate the well designed performance of the hardness and biot ribological behaviors. The abrasive and fatigue wear are the main wear mechanisms for CHA/ U HMWPE composite cups. The sizes of the wear particles become larger with the increase of CHA powders addition.