| 摘要 |
PURPOSE:To obtain a silica glass prevented from crack or fissure development by gelling a sol solution prepared by hydrolyzing a silicon alkoxide incorporated with (N-)morpholine and silica fine granules, followed by drying and calcination. CONSTITUTION:A silicon alkoxide or its polycondensate is incorporated with 0.1-5.0 molar times of morpholine and/or N-morpholine and silica fine granules and the resultant system is homogeneously dispersed in the presence of a solvent followed by addition of water in the presence of a catalyst to make a hydrolysis, thus preparing a sol solution. Thence, this solution is gelled at >=0 deg.C and the resultant gel is left to stand at 0-100 deg.C for several minutes to several tens days to effect drying followed by calcination by heating at a rate of 50-200 deg.C to 1000-1300 deg.C. |
