Glass manufacturing – Processes – With shaping of particulate material and subsequent fusing...
Patent
1995-07-11
1998-06-09
Griffin, Steven P.
Glass manufacturing
Processes
With shaping of particulate material and subsequent fusing...
65 71, 65 81, 65144, 65302, 65DIG8, C03B 1904
Patent
active
057626723
ABSTRACT:
In a quartz glass crucible obtained by heating and fusing a rotating layer (3) charged with a powder of silicon dioxide, impurity elements are controlled so that copper, chromium, and nickel each amount to 0.5 ppb or less, iron amounts to 120 ppb or less, and sodium amounts to 20 ppb or less. The silicon dioxide powder is supplied to a rotatable mold (1) having an open top, thereby forming a layer (3) charged with silicon dioxide along the inner peripheral wall of the mold. The layer (3) is internally heated and fused while covering the open top with a lid (5) having two or more holes (6,7), and the mold (1) is ventilated to discharge the high temperature gases through the holes (6,7).
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Asajima Kazuo
Ikeda Tooru
Kimura Hiroshi
Watanabe Hiroyuki
Griffin Steven P.
Heraeus Quarzglas GmbH
Shin-Etsu Quartz Products Ltd.
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