| 摘要 |
PURPOSE:To obtain a practical large-sized alumina sintered body free from cracks by adding crystal seed and a drying rate controlling agent to a boehmite sol when an alumina sintered body is produced by a sol-gel process. CONSTITUTION:Fine oxide powder as crystal seed and a drying rate controlling agent are added to a boehmite or pseudo-boehmite sol and this sol is dried, converted into gel and sintered. The drying rate controlling agent is preferably polyethylene glycol having 200-600 average mol.wt. used by 0.005-0.12g per 1g boehmite or pseudo-boehmite or oxalic acid used by 0.004-0.04g. |
