Non-destructive evaluation method for coated carbon-carbon compo

Details Non-destructive evaluation method for coated carbon-carbon compo Non-destructive evaluation method for coated carbon-carbon compo

1985-09-05

1987-04-28

Childs, Sadie L.

Coating processes

Measuring, testing, or indicating

427140, 4273762, 427379, 4273977, B32B 3500

Patent

active

046613692

ABSTRACT:
A non-destructive technique for detecting and repairing surface flaws in the silicon carbide oxidation resistant coating of a carbon-carbon composite. The surface of the composite is treated with a test liquid consisting essentially of a carrier fluid, a particulate pigment and a finely divided borosilicate glass, or a mixture of silicon dioxide and boron oxide, containing 0.25 to 8 weight percent boron oxide. The treated surface is inspected for surface flaws. Any discovered flaws are repaired by heating the surface to cause the borosilicate glass to flow and heal the flaw. The composite is thereafter heated to a further elevated temperature to deplete the boron from the flaw-sealing glass.

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