| 摘要 |
PURPOSE:In sol preparation in quartz glass production process by sol-gel method, to obtain uniform sol having the aimed particle diameter in a short time, by predispersing fine powder silica into water and hydrolyzing it with an alkyl silicate. CONSTITUTION:An alkyl silicate is simultaneously blended with fine powder silica and water, hydrolyzed by stirring and ultrasonic irradiation and gelatinized to produce quartz glass by sol-gel method. In the operation, when the fine powder silica is predispersed into a necessary amount of water in a sol preparation process, the silica which is aggregated once and grows larger particle is blended with the alkyl silicate and water, the aggregated silica is extremely readily dispersed by the stirring and ultrasonic irradiation and hydrolyzed in the presence of a catalyst such as hydrochloric acid, etc., to give sol having the desired particle diameter in a short time. |
