人工软骨材料摩擦学特性的研究

Study On Tribological Behaviour Of Materials Of Artificial Articular Cartilage

为了改善现行人工关节的润滑性能,需采用全新的结构设计,研制具有良好润滑性能的低弹性模量材料。本文用自行研制的振子式摩擦仪观测了生物相容性较好的三种聚合物材料,即硅橡胶、聚氨酯、聚乙烯醇水凝胶(PVA—H)的摩擦系数和润滑机理。试验结果表明:有润滑时,硅橡胶和聚氨酯分别与316L不锈钢组成的摩擦副,其润滑机理是边界润滑,聚乙烯醇水凝胶(PVA—H)/316L不锈钢摩擦副的润滑机理为混合润滑。

In order to improve the lubricating behaviour of artificial joints, an overall new constructional design should be adopted, the materials with low elastic modulus and good lubricating behaviour, i. e. the elastomeric polymer, is developed. An oscillator-type tribometer developed by ourselves is used to determine the friclional coefficients and to differentiate the lubricating mechanism for three kinds of bio- compatible polymer (i. e. silicone rubber, polyurethane and polyvinylalcohol hydrogel). The experimental results showed that the lubricating mechanism for the lubricated sliding pairs of silicone rubber/316L stainless steel and polyurethane/316L stainless steel are boundary lubrication, and the lubricating mechanism fnr the lubricated sliding pair of polyvinylalcohol hydrogel/316L stainless steel is mixed lubrication.