Surface protection of porous ceramic bodies

Details Surface protection of porous ceramic bodies Surface protection of porous ceramic bodies

1994-04-29

1997-12-30

Speer, Timothy

Coating processes

Solid particles or fibers applied

Interior or hollow article coating

427230, 4273722, 4273762, 4273977, 4273978, 4274432, B05D 722

Patent

active

057027617

ABSTRACT:
A surface of a porous ceramic body is protected by binding ceramic particles entirely within the subsurface porosity of the body adjacent to the surface but not present as a separately identifiable surface layer. To produce such a protective layer, a slurry of a mixture of a ceramic powder and a silica-containing binding agent is first prepared. The slurry is impregnated into the surface of the body so that all of the slurry enters the porosity of the body and substantially none of the slurry resides on the surface. The slurry is dried in place, and the residual solids are fired to bind the ceramic powder to the interior walls of the porosity. Drying and firing can be accomplished at intermediate temperatures of about 700.degree.-1000.degree. F. using heat lamps, so that the surface protection can be accomplished without removing the ceramic body from a larger structure.

REFERENCES:
patent: 4082863 (1978-04-01), Dancy
patent: 4370363 (1983-01-01), Schulz
patent: 4735757 (1988-04-01), Yamamoto
patent: 4910079 (1990-03-01), Shroff
patent: 5079082 (1992-01-01), Leiser et al.
patent: 5227199 (1993-07-01), Hazlebeck
Anon., "Ceramic -Fibrous-Insulation Thermal-Protection System", NASA Tech. Briefs, p. 48 (Jan. 1992).

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