Duplex coatings for various substrates

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428621, 428632, 428665, 428698, 428697, 428701, 428702, B32B 1500

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052233324

ABSTRACT:
A duplex coating for substrates that comprises an undercoat of tungsten carbide-cobalt having a strain-to-fracture of greater than 4.3.times.10.sup.-3 inch per inch and a top coat of a ceramic material such as alumina in which the ratio of the thickness of the top coat to the undercoat is from 6:1 to 1:3.

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Muller et al "Applying Tungsten Carbide Cobal Coatings by High Velocity Combustion Spraying" Sulzer Technical Review Apr. 1988 pp. 4-10.
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