Abstract
In order to extend operating life of artificial hip joint, new manufacturing process of micro-crater on Co-Cr-Mo alloy surface using electron beam-irradiation and polishing have been proposed. The electron beam-irradiation could form micro-craters with 60 micrometers in average-diameter and about 10 micrometers in maximum height for 10 minutes. These micro-craters would have the similar shapes of live hip joints. The pin-on-disk friction tests were carried out for evaluating the lubricity.
