Abstract

The quartz glasses were prepared by sintering of fumed silica powders and the effect of OH concentration on their surface on sintering was studied. Through the firing process, the fumed silica was crystallized from 1180 to 1260°C region. The amount of hydroxyl group decreased with increase in calcination temperature and consequently the crystallization was prevented. A transparent quartz glass was obtained from fumed silica, previously calcined at 1000°C, by the sintering at 1250°C for 1 h.

• Keywords: Quartz;Glass;Fumed Silica;SiO_2;