Patent ID: 6620749
Filing Date: 2003-09-16
Classification: C04B

Abstract:
An oxidation-stable, high temperature, porous ceramic insulation obtained by reacting effective amounts of (a) at least one tetraalkoxy silane having the formula:Si(OR1)4 wherein R1 is a saturated or unsaturated organic radical having 1 to 12 carbons and (b) at least one dialkoxy silane having the formula:(R2O)2â€”Siâ€”R4R3 wherein R2 is a saturated or unsaturated organic radical having 1 to 12 carbons and R4 and R3 are saturated or unsaturated, either the same or different organic radicals having 1 to 12 carbons to obtain a siloxane gel (c) subsequently drying and pyrolyzing the siloxane gel in an inert atmosphere at temperatures ranging from about 900Â° C. to 1500Â° C. to produce the porous ceramic insulation having a density ranging from about 0.12 g/cc. to 0.6 g/cc.