Method of making a silica crucible in a controlled atmosphere
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United States of America Patent
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Apr 14, 2015
Grant Date -
May 26, 2011
app pub date -
Nov 20, 2009
filing date -
Nov 20, 2009
priority date (Note) -
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Abstract
A silica crucible is made in a mold cavity of the type in which ambient atmosphere can be drawn through silica grain in the cavity. In one embodiment, a silica grain layer is formed in the mold cavity and gas, which may comprise helium, nitrogen, hydrogen, or a mixture thereof, is introduced into the mold cavity. The silica grain layer is heated while substantially no ambient atmosphere is drawn through the silica grain. Thereafter, at least a portion of the silica grain layer is fused while drawing ambient atmosphere through the silica grain. The gas displaces air in the mold cavity thereby reducing nitrogen oxides and ozone.
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