VITREOUS SILICA CRUCIBLE AND METHOD OF MANUFACTURING THE SAME
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United States of America Patent
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Issued Date -
Jan 27, 2011
app pub date -
Mar 10, 2009
filing date -
Mar 14, 2008
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Abandoned
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Abstract
, a region between 0.3 mm and 3 mm from the crucible inner surface has an OH group concentration and an OH group concentration gradient which increase as a distance from the inner surface decreases, and decrease as a distance from the inner surface increases. The vitreous silica crucible can be manufactured by a process comprising the step of heating and melting silica powder deposited on an inner surface of a rotating mold to vitrify the silica powder, wherein vapor-containing air is introduced during or right after the melting, or the crucible is reheated, after the melting and cooling, under a vapor-containing environment.
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