| 摘要 |
PURPOSE:To produce large-sized silica glass without causing crackings and cracks in producing silica glass by sol-gel method, by adding morpholine and/or N-morpholine in a process of making a sol solution. CONSTITUTION:Morpholine and/or N-morpholine and water are added to a silicon alkoxide or a polycondensate thereof, which is hydrolyzed to give silica hydrosol. The sol solution is gelatinized, the gel is dried to give silica gel and the dried gel is sintered to give silica glass. By this method, occurrence of big stress made of evaporation of water, alcohol, etc., considered to be a cause of crackings and cracks during gel drying can be avoided. |
