| 摘要 |
PURPOSE:To improve light transmittance by grinding alumina powder consisting of L-alumina and L-alumina and intermediate alumina with a specific grinding medium in a wet state. CONSTITUTION:An organic aluminum is hydrolyzed to give alumina powder consisting of L-alumina and L-alumina and intermediate alumina having >=99.0% purity, 10-100% coarse particles having >=1mum particle diameter and 1-70m<2>/g BET specific surface area. 10-75wt.% of the alumina powder, water, an organic dispersant and 30-70vol.% grinding medium made of alumina or zirconia having 0.2-5mm diameter are fed to a wet type pulverizer and ground in a wet state for 10 minutes to 1 hour. |
