| 摘要 |
PURPOSE:To obtain the title high-purity translucent quartz glass difficult to devitrify by enclosing silica powder as the raw material in a vessel, and treating the vessel at high temp. and pressure by a hot isotropic press to partially open the vessel. CONSTITUTION:The silica powder having >=about 99.9% purity is used as the starting material, and enclosed in the vessel made of quartz glass or a high- melting-point metal. The vessel is placed in a hot isotropic press device, and treated at a temp. of >=about 1,500 deg.C and at a pressure of >=about 10MPa by using an inert gas such as high-purity Ar as a pressure medium to partially open the vessel. In the course of the treatment, the inert gas as the pressure medium infiltrates into the vessel, small bubbles are generated in the quartz glass, and quartz glass made translucent is obtained. After treatment, the surface of the vessel used is shave off. |
