| 摘要 |
PURPOSE:An alkali containing zirconium hydroxide dispersing therein as seeds is added to an aqueous solution containing water-soluble Zr compunds and a specific water-soluble metal salt and the resultant precipitate is roasted to give a partially stabilized ZrO2 with uniform composition and crystals. CONSTITUTION:A solution containing a water-soluble Zr compound such as zirconium oxychloride is mixed with a stabilizer consisting of at least one selected from water-soluble metal compounds of Y, Mg, Cr, and Ca in such an amount as the content of at least one of Y, Mg, Ce and Ca sill be 2.5-4.0mol% in the form of their oxides based on ZrO2 and dissolved with thorough stirring. Then, an aqueous solution of a (carbonate) alkali compound such as sodium hydroxide or sodium carbonate containing 1-10wt%, based on the ZrO2 to be prepared, of ZrO2 dispersed as seeds is added to the above- stated solution to effect the precipitation of zirconium hydroxide. The precipitate is filtered, dried and roasted at 600-1,300 deg.C to give a powder of partially stabilized ZrO2. |
