Overlay coatings for superalloys

Details Overlay coatings for superalloys Overlay coatings for superalloys

C - Chemistry, Metallurgy

22

C

75/13, 117/225

C22C 19/00 (2006.01) C22C 19/05 (2006.01) C23C 4/08 (2006.01) C23C 30/00 (2006.01) F01D 25/00 (2006.01)

Patent

CA 1185129

Abstract Improved coating compositions are described for the protection of superalloys at elevated temperatures. The coatings are of the MCrAlY type where M is nickel or cobalt and are significantly improved by the addition of from .1-7% silicon and .1-2% hafnium. Coatings of the invention are preferably applied by plasma spraying and as so applied are found to be substantially more effective than prior art coatings.

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