1230 金属材料の摩擦摩耗特性に及ぼす酸素濃度の影響(G02-5 関節と軟骨(2),G02 バイオエンジニアリング)

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The relationship between the dissolved oxygen in lubricating liquid and the tribological characteristic of a metal sliding on the same bearing material was investigated for design of metal-on-metal artificial hip joints. In a pin made from a cobalt-chromium-molybdenum (Co-Cr-Mo) alloy sliding on the same material, a decrease in wear was often observed with the decrease in dissolved oxygen. This result cannot be explained by the traditional adhesion theory. It was demonstrated that the decreased wear with the decrease in oxygen was accompanied by a change of the hardness of the bearing material. We speculated that an increase in adhesion between the bearing surfaces resulted from the imperfect formation of the oxide film. This increase in adhesion affected the work hardening of the bearing material so that the wear resistance changed.
2005-09-18