Sol-gel derived SiO.sub.2 /oxide power composites and their production
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United States of America Patent
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Sep 15, 1992
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N/A
app pub date -
Apr 19, 1989
filing date -
Apr 19, 1989
priority date (Note) -
Expired
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Abstract
A SiO.sub.2 /oxide powder composite made by preparing a sol containing SiO.sub.2 and optionally Al.sub.2 O.sub.3, Li.sub.2 O, Na.sub.2 O, TiO.sub.2, B.sub.2 O.sub.3 and mixtures thereof with oxide powder consisting of SiO.sub.2, Al.sub.2 O.sub.3, ZrO.sub.2, TiO.sub.2, Li.sub.2 O-TiO.sub.2, Li.sub.2 O-Al.sub.2 O.sub.3 -TiO.sub.2, .beta. spodumene crystals, .beta. eucryptite crystals, aluminum titanate, 68 SiO.sub.2 -21.4 Al.sub.2 O.sub.3 -5.7 TiO.sub.2 -3.8 Li.sub.2 O (mole %) and mixtures thereof having a size from about 10 microns to about 0.001 micron dispersed therein, gelling the sol to produce a monolithic SiO.sub.2 gel matrix having homogeneously distributed therein the oxide powder, and drying the monolithic SiO.sub.2 gel/oxide powder composite.
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