| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an alumina sintered compact for firing a ceramic which contains crystal grains having small diameters even when they are obtained by high temperature sintering, and which exhibits excellent thermal shock resistance and durability at the time of rapid heating and rapid cooling, or the like. <P>SOLUTION: After mixing raw materials comprising ≥90 wt.% alumina and 0.05-10 wt.% of any of zirconia, magnesia and calcia or 0.05-10 wt.% in total of two or more components, the resulting mixture is subjected to cast forming or press forming. The maximum crystal grain size of the sintered compact is controlled to be ≤30 μm. Even when the formed body is sintered at a high temperature, the crystal grain sizes of the sintered compact are controlled to be small and uniform. Thereby, the zirconia, magnesia, calcia-compounded alumina sintered compact excellent in thermal shock resistance and durability at the time of rapid heating and rapid cooling, or the like can be obtained. <P>COPYRIGHT: (C)2004,JPO |
