| 摘要 |
<P>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. <P>SOLUTION: The zirconia sintered body comprises Y<SB>2</SB>O<SB>3</SB>as a stabilizing agent and Al<SB>2</SB>O<SB>3</SB>, 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. <P>COPYRIGHT: (C)2004,JPO |
