| 摘要 |
PURPOSE:To produce large-sized quartz glass of high quality in high yield at a low cost, by using a specific raw material in production of the quartz glass the sol-gel method using hydrolysis of a metal alkoxide. CONSTITUTION:An alkyl silicate expressed by formula I (R is 1-10C alkyl), e.g. ethyl silicate, alcohol expressed by formula II (R is as described above), e.g. ethanol, water, acid, e.g. hydrochloric acid or acetic acid, and base, e.g. ammonia, are used as raw mateials to synthesize quartz glass at a low temperature by the sol-gel method using hydrolysis of a metal alkoxide. In the process, ultrafine powdery silica is used to give a dried porous gel which is not easily cracked in sintering and produce the aimed quartz glass of good quality without air bubbles after the sintering. The use of the base provides adjustment of pH values in the prepared sol, and the gelation rate and strength of the gel structure can be controlled. Thus, the large-sized dried gel can be prepared in high yield without cracking, and the aimed quartz glass of high quality can be produced at a low temperature and low cost. |
