| 摘要 |
PURPOSE:To manufacture many pieces of dry gel at once at the same drying speed when quartz glass is manufactured by a sol-gel method, by pouring prepd. sol into a large-sized vessel divided into square parts with partition plates and by drying the sol in one lot. CONSTITUTION:About 5.3l ethyl silicate and about 4.3l 0.05N hydrochloric acid are stirred, and about 1.8kg fine silica powder is gradually added. They are well stirred to prepare sol, and this sol is adjusted to about 4.5pH with an aqueous ammonia soln. The sol is then poured into a large-sized vessel divided into square parts with partition plates by about 500g per one square part. The vessel is placed in a drier, where the sol is dried at about 60 deg.C for 1 week. The resulting dry gel is taken out of each square part and sintered to manufacture quartz glass. |
