Nickel/cobalt-chromium-base alloys for gas turbine engine...

Details Nickel/cobalt-chromium-base alloys for gas turbine engine... Nickel/cobalt-chromium-base alloys for gas turbine engine...

C - Chemistry, Metallurgy

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C

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C22C 30/00 (2006.01) C22C 19/05 (2006.01) C22C 19/07 (2006.01) C23C 28/02 (2006.01) C23C 30/00 (2006.01) F01D 5/28 (2006.01)

Patent

CA 1173670

ABSTRACT An alloy comprising by weight percent from 20% to 40% Cr, from 1% to 5% Ti, from 2% to 10% Al, and the balance nickel or nickel and cobalt, is used for coating gas turbine components to give protection against oxidation - and sulphidation - corrosion. A specific alloy having the composition Ni-37 Cr-3 Ti-2Al is applied to a blade fabricated from a nickel superalloy by sputter ion plating to give an overlay coating up to 100 thick. Preferably a platinum intermediate layer is flashed on to the substrate before coating. The coating alloy can additionally include rare earths, hafnium or silicon.

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