A thin, room-temperature-curing, ceramic composite for coating and patching etal substrates comprises a sol gel silica glass matrix filled with finely ground particles or fibers, preferably alumina. The sol gel glass is made by adding ethanol to water to form a first mixture, then separately adding ethanol to tetraethyl orthosilicate to form a second mixture, then slowly adding the first to the second mixture to make a third mixture, and making a slurry by adding the finely ground particles or fibers to the third mixture. The composite can be applied by spraying, brushing or trowelling. If applied to patch fine cracks, densification of the ceramic composite may be obtained to enhance sealing by applying heat during curing.
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION AND CONTRACT STATEMENT
The present invention relates to opaque ceramic composites for coating patching, sealing or otherwise, repairing substrates. The United States Government has rights in this invention pursuant to Contract No. DE-AC09-76SR00001 between the Department of Energy and E. I. DuPont De Nemours & Co.