| 摘要 |
PURPOSE:In producing glass by sol-gel method, to readily eliminate bubbles occurring in hydrolysis without increasing an amount of an alcohol used and to make it possible to produce high-quality glass free from bubbles in a short time, by hydrolyzing a sol solution under reduced pressure. CONSTITUTION:One or more of metallic alcoholates such as Si(OCH3)4, Si(OC2 H5)4, Ti(CO4H9)4, Zr(OC2H5)4, etc. are dissolved in water and an alcohol such as methanol, ethanol, etc., to give a solution of the metallic alcoholate (sol solution). The solution is incorporated with an acid or alkali as a catalyst, hydrolyzed in a vacuum device such as a vacuum desiccator, vacuum furnace, etc., at room temperature - 80 deg.C while stirring and gelatinized. Since the operations are carried out under reduced pressure, high-quality glass hardly containing bubbles occurring upto gelatinization can be produced in an extremely short time even if the amount of the alcohol used is not increased. |
