| 摘要 |
PURPOSE:To provide an organism implantation member where a porous layer is hard to fall off from a base body, and fatigue strength is improved with the less number of precipitated ions by forming the specific thickness of a titanium composition porous layer containing a specific ratio of oxygen and nitrogen at least on the joint surface of a titanium or titanium alloy base body with a bone. CONSTITUTION:A porous layer B of thickness between 100mum to 3mm mainly composed of titanium, and containing 0.8 to 2.8wt.% of oxygen and 6.1 to 9.6wt.% of nitrogen is formed in an organism implantation member 1 at least on the joint surface of a titanium or titanium alloy base body A with a bone. In this case, the titanium or titanium alloy is sprayed by an electric arc spraying method or the like in the atmospheric air, the atmosphere where the mixing ratio of the atmospheric air and nitrogen gas is between 1:2 and 2:2, or the atmosphere where the mixing ratio of the atmospheric air and oxygen is between 2:1 and 4:1, thereby forming the porous layer B of thickness between 100mum and 3mm. In addition, the layer B is heat-treated at a temperature between 300 deg.C and 1,650 deg.C, thereby manufacturing the organism implantation material 1. |
