| 摘要 |
PURPOSE:To inexpensively obtain quartz glass without causing cracking, warping, etc., by charging the hydrolyzate of alkyl silicate into a plurality of open containers, placing the containers in a large container, putting a cover having holes, manufacturing dry gel, and calcining the gel. CONSTITUTION:Alkyl silicate is mixed with water and ethanol, the alkyl silicate is hydrolyzed with stirring, and the hydrolyzate is charged into a plurality of open containers 6. The containers 6 are placed in a large container 5 having shelves 8 made of a net or the like, a cover 9 having holes is put, and the container 5 is set in a thermostat kept at a fixed temp. By evaporating the solvent, the hydrolyzate is concentrated to obtain dry gel. Since steam generated from the containers 6 is filled in the container 5, drying is carried out at a uniform evaporation rate, so cracking, warping, etc. are prevented. The dry gel is calcined at a suitable heating rate to obtain the desired quartz glass. |
