| 摘要 |
<p>The present invention refers to a method for manufacturing a silica glass block in which, by markedly reducing the bubbles within the silica glass block, the quality of a silica glass block can be improved, contamination of the silica glass block can be prevented, and the yield of the silica glass block can be improved.
The method comprises:
a preparing step for preparing a natural or synthetic silica raw material powder (12);
a packing step for packing the silica raw material powder into a glass fusing furnace (10);
a preheat treating step for preheat treating the silica raw material powder (12) packed into the fusing furnace (10);
a fusing step for heating and fusing the heat preheat-treated silica raw material powder (12); and
a cooling step for cooling a silica glass melt fused in the fusing furnace, and is characterized in that the silica raw material powder packed into the fusing furnace is closely packed in the packing step, to a packing density of no less than 1.4 g/cm 3 and no more than 1.6 g/cm 3 , and an evacuation and a rare gas or H 2 gas introduction treatment is performed in the preheat treating step.</p> |
