| 摘要 |
PURPOSE:To efficiently manufacture high-purity quartz glass powder without requiring a pulverizing stage, by forming fine-grained gel from ethyl silicate or the like in the presence of boric acid as a catalyst and by separating and calcining the gel. CONSTITUTION:To ethyl silicate (or propyl silicate) is added about 4-6mol water contg. boric acid so that boric acid is contained by about 1-300mmol per 1mol ethyl silicate. The molar ratio of ethyl silicate: boric acid: water is about 1: (0.001-0.3):(4-6). They are held in a suspended state by vigorous agitation to form powdered gel. The gel is separated from the mother liquor contg. by- product alcohol, washed, dried, and calcined at about 1,000 deg.C to obtain quartz glass powder. |
