| 摘要 |
PURPOSE:To remove striae in quartz glass in a short time in high yield, maintaining the initial shape of the glass, by heating a striae-containing quartz glass in an inert gas atmosphere under specific condition under pressure. CONSTITUTION:A quartz glass 1 containing striae is set in a carbon compression mold 3 filled with powder 2 (e.g. SiC) inert to quartz glass and having particle diameter of 50mum-5mm and pressed with a carbon punch 4 under a pressure of >=10 MPa in an inert gas atmosphere at >=1,500 deg.C. |
