Platinum group silicide modified aluminide coating process...

Details Platinum group silicide modified aluminide coating process... Platinum group silicide modified aluminide coating process...

C - Chemistry, Metallurgy

23

C

C23C 8/78 (2006.01) C23C 10/02 (2006.01) C23C 10/58 (2006.01) C23C 10/60 (2006.01)

Patent

CA 2130058

Process for producing novel coated nickel and/or cobalt superalloy bodies having increased resistance to oxidation, corrosion and thermal fatigue at high temperatures. The process comprises applying a thin layer of a platinum-group metal, siliciding and heating to an elevated temperature to diffuse and integrate the silicided platinum-group metal into the surface of the superalloy body. Then the superalloy body is exposed to a diffusion powder composition containing sources of aluminum or aluminum/chromium metals and heated in a hydrogen or inert gas atmosphere to an elevated temperature to codeposit and diffuse aluminum or aluminum and chromium into the silicided platinum-group metal-treated surface. Finally, the superalloy body is heated to its solvus temperature to form a ductile surface having an outer zone comprising a platinum-group metal aluminide, optionally ductilized by the solutioning therein of beta chromium. An inner stabilizing zone of silicon-rich phases is formed during said diffusion processes.

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