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US 5,492,726 AGranted
Platinum group silicide modified aluminide coating process and products
AssigneeWalbar Inc.
InventorsBernard R. Rose, Patrick R. Lavery
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AssigneeWalbar Inc.
InventorsBernard R. Rose, Patrick R. Lavery
Estimating the term…
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.
Process for increasing oxidation and corrosion resistance of superalloy bodies while also increasing the ductility and improving the heat stability thereof comprising the steps of:
Process for increasing oxidation and corrosion resistance of superalloy bodies while also increasing the ductility and improving the heat stability thereof comprising the steps of:
Dependencies are inferred from the claim text.