| 摘要 |
PURPOSE:To manufacture large quartz glass by a sol-gel method by using a hydrophobic material as the material of a sol holding container in gelling and dry gel forming stages so that gel slips easily. CONSTITUTION:Hyperfine silica powder is added to sol prepd. by hydrolyzing a metallic alkoxide such as silicon ethoxide by 0.2-5mol per 1mol alkoxide. The sol contg. the silica powder is made to gel and dried to form dry gel, and quartz glass is manufactured by sintering the dry gel. At this time, a hydrophobic material such as PP or PVC is used as the material of a sol holding container in the gelling and dry gel forming stages. The affinity between the resulting gel and the container is weak, and the gel slips easily, so quartz glass plates of a large area or quartz glass blocks of a large volume can be manufactured in a high yield. |
