| 摘要 |
PURPOSE:To readily obtain a large-sized silica glass free from cracks and/or fissures, by gelling a silica sol produced by hydrolysis of a silicone alkoxide in the presence of a polyacrylic ester followed by drying and then sintering. CONSTITUTION:A solution prepared by adding water and a base to an alcohol (e.g., methyl alcohol) in which a polyacrylic ester has been dissolved is incorporated with a silicone alkoxide of the formula Si(OR)4 (R is alkyl) followed by hydrolysis to produce a silica sol. Thence, this silica sol is transferred to a vessel being gelled at room temperature - 70 deg.C followed by drying for several weeks at temperatures equal to or higher than room temperature to form a dry gel. This gel is then sintered at 1,000-1,400 deg.C in air, thus obtaining the objective silica glass. |
