Silica crucible with pure and bubble free inner crucible layer and method of making the same
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United States of America Patent
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Sep 25, 2012
Grant Date -
Jun 24, 2010
app pub date -
Feb 12, 2009
filing date -
Dec 19, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of making a silica crucible in a mold cavity of the type in which air is drawing through silica grain placed in the mold cavity. A pure silica grain layer is formed on top of a natural silica grain layer. At least a portion of the purse silica grain layer is fused while substantially no air is drawn through the silica grain. Any remaining pure silica grain and a least a portion of the natural silica grain layer is fused while drawing a substantially higher volume of air through the silica. At least a portion of the fused pure silica grain layer is then sublimated.
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