PRODUCTION OF QUARTZ GLASS

摘要

PURPOSE:To obtain a uniform and high-quality quartz glass free of contaminant, by filtering a sol solution used as a raw material once or more in sol-gel process, and gelling the sol solution under centrifugal force. CONSTITUTION:Sol solution composed mainly of an alkyl silicate and ultrafine silica powder is filtered once or more with a filter to remove the undissolved lumps larger than the mesh size of the filter. The filtrate is gelled under centrifugal force to remove large silica aggregate formed by the local gelation in the pH-control of the sol solution.