| 摘要 |
PURPOSE:To carry out the processing of a fused quartz article without increasing the OH-concentration in the fused quartz article, by applying a gas generated by the combustion of CO gas and O2 gas to the fused quartz article to be processed, and processing the softened article. CONSTITUTION:CO gas and O2 gas are supplied to the center channel 5 and the outer channel 6 from the bombs 7, 10 via the valves 8, 11 and the connecting pipes 9, 12, respectively, and burnt at the tip 13 of the burner 4 to form the flame 14 of 1,600-2,000 deg.C. The flame 14 is applied to the surface 3 of a hole 2 bored to a fused quartz article 1 to effect the softening of the article and the softened article is processed.
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