Metal-on-Metal人工股関節のトライボ特性に及ぼす潤滑液溶存酸素の影響(<特集>生体材料のバイオエンジニアリング)

概要

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It is known that the metallic oxide film of bearing surfaces markedly affects the wear process. Influence of dissolved oxygen in the lubricating liquid containing principal constituents of synovial fluid on wear characteristics of Co-Cr-Mo alloy used in a metal-on-metal artificial hip joint has been investigated by using a pin-on-plate wear machine. Concentration of the dissolved oxygen was adjusted by N_2 injection in the enclosure which covered pin and plate. It was observed that the decrease in oxygen concentration, which was similar to be in vivo, caused the wear to decrease. The material properties of the bearing surface were controlled by the oxygen concentration. The bearing surface tended to be smooth in lower oxygen concentrations. The friction coefficient increased in the low oxygen concentration. The experimental results indicated that the decrease in oxygen concentration made the adhesion between bearing surfaces increase. The increase in adhesion leads to a high frictional force. The high adhesion and frictional force brought about work hardening and fine structure of the bearing surface, so that the wear was decreased.
一般社団法人日本機械学会の論文
2003-01-25