Mold for producing silica crucible
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United States of America Patent
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Jan 24, 2012
Grant Date -
Jul 15, 2010
app pub date -
Jan 15, 2010
filing date -
Jan 15, 2009
priority date (Note) -
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Abstract
There is provided a mold for use in the production of a silica crucible by heat-fusing silica or quartz powder attached onto an inner wall of a rotating mold, wherein an inner side of an upper opening portion of the mold corresponding to an upper part of the silica crucible is ground to obtain a step portion and a ring-shaped heat insulating barrier member having an inner diameter smaller than that of the mold is disposed on the step portion through a hollow disk-shaped support member having an inner diameter equal to or somewhat larger than that of the heat insulating barrier member.
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