Highly durable silica glass, process and apparatus for producing same, and member and apparatus provided with same
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United States of America Patent
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Jun 20, 2006
Grant Date -
Jun 17, 2004
app pub date -
Nov 24, 2003
filing date -
Mar 26, 2001
priority date (Note) -
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Abstract
Highly durable silica glass containing 0.01% to 2% by weight of at least one element selected from magnesium, calcium, strontium, barium, yttrium, hafnium and zirconium. The silica glass is produced by melting a powdery material comprising a finely divided silica powder and a finely divided zirconium-containing substance by oxyhydrogen flame or plasma are to form an accumulated molten material layer, and extending the molten material layer outwardly in radial directions.
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