| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a stabilized zirconia polycrystalline sintered body that does not contain a transition metal oxide such as TiO2 or contains the same in an extremely reduced amount, uses yttria as a major stabilizer to zirconia, has high transparency and is chemically stable. <P>SOLUTION: A primary sintered body having a density of 95% or more obtained by sintering a zirconia powder comprising an yttria main component as a stabilizer under ordinary pressure is set in a vessel of a semi-sealed state and subjected to HIP treatment (secondary sintering) at a temperature of 1,600 to 1,900 °C. under a pressure of 50 MPa or high, and according to need, heated treated in an oxidizing atmosphere, thereby producing a polycrystalline sintered body of zirconia having high transparency of an in-line transmission of 50% or higher. <P>COPYRIGHT: (C)2007,JPO&INPIT |
