Method of repairing surface damage to porous refractory substrates
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsGlenn M. Ecord, Calvin Schomburg
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Abstract
A method of repairing damage to a porous refractory material coated with a glass coating (16) comprising applying hydrolyzed tetraethyl orthosilicate to the damaged area, curing said tetraethyl orthosilicate, applying to said damaged area a pliable filler (30) comprised of hydrolyzed tetraethyl orthosilicate and powdered refractory substrate (11) and heating the damaged area to cure filler (30).
Claims15
A method of repairing damage to a porous refractory material which may be coated with a glass coating comprising applying hydroylyzed tetraethyl orthosilicate to the damaged area, curing said hydrolyzed tetraethyl orthosilicate, applying to said damaged area a pliable filler comprised of hydrolyzed tetraethyl orthosilicate and powdered refractory substrate, and heating the damaged area to cure said filler.
A method of in situ repair of damaged areas of thermal insulating tiles for a spacecraft, wherein the tiles are formed of substantially chemically pure silica fibers which are rigidized with a high purity silica binder, the tiles being waterproofed with a silane waterproofing agent and coated with a relatively thin layer of borosilicate glass, said method comprising:
- applying hydrolyzed tetraethyl orthosilicate to the damaged area, curing said hydrolyzed tetraethyl orthosilicate, wetting the damaged area with a second coating of hydrolyzed tetraethyl orthosilicate, applying a filler material to the damaged area, the filler material formed of approximately 60% by weight of fine silica fibers and hydrolyzed tetraethyl orthosilicate, the filler material completely filling the damaged area, curing the filler material, then matching the filler material to the surface of the tiles, and applying a waterproofing agent to the filler material.
Dependencies are inferred from the claim text.