| 摘要 |
PURPOSE:To obtain quartz glass of extremely high purity inexpensively by utilizing a fact that the starting material of the quartz glass in the sol-gel process is in a state of low viscosity in the midway of its prepn., and performing ion exchange treatment during the stage of low vicosity of the soln. CONSTITUTION:A soln. contg. fine SiO2 powder or silica sol obtd. by the hydrolysis of alkyl silicate is treated with an ion exchange resin to remove cations (e.g. Na<+>, K<+>, Al<3+>, etc.) contained as impurities in the soln. The treated soln. is then transferred to an appropriate vessel where it is evaporated and dried to obtain dry gel. Aimed quartz glass of high purity is obtd. by firing the dry gel. |
