C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
117/53, 75/1.2
C22C 29/00 (2006.01) B05D 1/10 (2006.01) C23C 4/08 (2006.01)
Patent
CA 1168477
ABSTRACT OF THE DISCLOSURE A protectively coated superalloy has improved oxidation, corrosion, and wear resistance at elevated tempera- tures. The protective coating is a MCrAlY type alloy having a carbon content of 0.6 to 11 percent and is characterized in a preferred embodiment by having a carbon bearing matrix contain- ing metal carbides of 1-2 microns mean size and chromium carbides of less than 12 microns. The coating is preferably produced by plasma spraying and heat treatment. This method involves applying a wear resisting MCrAlY coating by plasma spraying a mixture of MCrAlY and Cr3C2 powders to form a coating having both fine carbides and coarser Cr3C2 carbides in an MCrAlY matrix. Heat treatment at 1080°C after coating bonds the substrate and coating and forms further fine carbides. The coating desirably consists of by weight percent 18-80 Cr, 1.2-29 Al, up to 4.8 Y, 0.6-11 C, balance selected from the group consisting of Ni, Co, Fe, or mixtures thereof.
362144
Mccomas Charles C.
Morris James W.
Sokol Larry S.
Swabey Ogilvy Renault
United Technologies Corporation
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