| 摘要 |
PURPOSE:To obtain an alumina ceramic maintaining sufficiently high mechanical strength and corrosion resistance even in a high-temperature calcination as a container for the calcination of fluorescent material, etc., by mixing MgO powder, ZrO2 powder and Al2O3 powder at specific ratios and calcining the mixture. CONSTITUTION:The objective alumina ceramic is produced by selecting an aluminium compound, a magnesium compound and a zirconium compound from MgO powder, a magnesium compound capable of forming MgO by calcination, ZrO2 powder, a zirconium compound capable of forming ZrO2 by calcination, powder of sintered MgO.ZrO2, Al2O3 powder and an aluminum compound capable of forming Al2O3 by calcination, mixing the above compounds at the following ratios and calcining the mixture. The weight ratio of the magnesium compound to the zirconium compound is 2:8-7:3 in terms of MgO and ZrO2 and the sum of the above compounds is 0.1-0.65wt.% based on Al2O3. |
