Felfe & Lynch
Method for manufacturing quartz glass components and molding frame therefor
 A quartz glass component having a projection on a flat face is manufactured by molding a quartz glass body at a high temperature and under high pressure. The heating temperature is set to a range of from 1800.degree. to 2000.degree. C. and slight pressure is applied by the female die which forms the projection, or pressure in a direction against gravity. The molding die includes a graphite frame surrounding a molding space formed by a female die and a receiving die sandwiching the quartz glass body in the graphite frame. The space between the receiving die and the female die is width-reducible, the compositions of the graphite frame and the two graphite dies are made to differ, the female die and receiving die contacting the quartz glass body during pressure molding have a plurality of gas-permeable micropores such as in sintered graphite for example and are formed by a high-purity graphite material having air permeability. 
Heraeus Quarzglas GmbH Shin-Etsu Quartz Products Co., Ltd.
C C Y C Y C
C03B C03B Y02P C03B Y10S C03B
additional inventional additional additional additional inventional
Makoto Hideki Kimikazu Hiroyuki Norikazu Eiichi
Saito Tsuchida Taniyama Kimura Fujii Shinomiya