Sol-gel process for the production of glassy articles
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United States of America Patent
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Feb 27, 2007
Grant Date -
Mar 23, 2006
app pub date -
Dec 23, 2003
filing date -
Jan 15, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Glassy articles are prepared by subjecting to hydrolysis and policondensation a solution or suspension of a suitable precursor, mainly comprising a silicon alkoxide, and by drying the obtained gel in a pressure chamber, the gel solvent having been substituted by a non-protic solvent, mainly acetone, under nitrogen flowing, at temperature and pressure conditions lower than the gel solvent critical values. The dried gel is then densified by a thermal treatment.
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