| 摘要 |
PURPOSE:To produce zirconium oxide powder wherein homogeneous and fine rare earth element is formed solid solution by subjecting zirconium-rare earth element coprecipitation hydroxide to hydrothermal treatment and crystallizing it partially and lowering hydrothermal crystallization temp. CONSTITUTION:The following hydrated zirconium oxide powder is aged in the saturated steam atmosphere of 5-20kg/cm<2> in a hydrated state whose circumference is stuck with either zirconium-rare earth element coprecipitation hydroxide coprecipitated with rare earth element and zirconium or hydrated gelatinous unstable hydroxide of rare earth element. This aged material is roasted at 300-1,000 deg.C to produce zirconium oxide powder wherein rare earth element solid solution is formed. |
