Zirconia sintered body and its manufacturing method

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PROBLEM TO BE SOLVED : To provide a zirconia sintered body that has excellent aging resistance, has high reliability in resistance to fracture such as chipping because of high strength and exhibits excellent sliding properties as a sliding member. SOLUTION : The zirconia sintered body comprises Y2O3as a stabilizing agent and Al2O3, and preferably a La-based rare earth compound as a second additive component. It has an initial average strength of 1.3 GPa or more in the three-point bending test, and an average strength of 1.1 GPa or more after heat-treated at 300°C×24 hours in air. This zirconia sintering body has the crystal phase comprising mainly tetragonal crystals, some monoclinic crystals, and substantially no cubic crystal. COPYRIGHT : (C)2004, JPO