ショットピーニングを施した医療用Co-Cr合金のバレル研磨面の摩耗特性評価

抄録

The design life of artificial joints is 10 to 20 years and in an aging society, improvements in durability are expected. Therefore, as a method for improving fatigue characteristics, the authors have expected the effect of shot peening and reported that the fatigue properties of the Co-Cr alloy, which used as an artificial joint material, treated with Shot peening (SP) are significantly improved. In addition, mass finishing (MF) was applied to smooth the surface of the shot-peened Co-Cr alloy. It was confirmed that the high-performance layer obtained by the SP remained and was maintained. However, the wear properties using this method have not been verified.

In this study, we measure the friction coefficient and wear volume of the Co-Cr alloy surface that has undergone MF after SP and observe the wear marks. In addition, the wear characteristics and mechanism were examined from the viewpoint of the hardness characteristics affected by SP and MF. It was clarified that it is possible to improve the wear characteristics of Co-Cr alloy by applying MF after SP.