Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...
Patent
1994-03-14
1996-01-09
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
Producing or treating layered, bonded, welded, or...
148518, 427252, 427405, 4273831, C21D 900, C23C 1056
Patent
active
054825784
ABSTRACT:
Process for producing novel nickel superalloy bodies having increased resistance of to oxidation and corrosion at high temperatures. The process comprises applying a thin layer of a platinum-group metal and heating to an elevated temperature to diffuse or integrate the platinum-group metal into the surface of the metal superalloy. Then the superalloy body is packed into a container filled with a diffusion powder composition containing sources of aluminum and chromium metals and heated in a hydrogen gas atmosphere to an elevated temperature to codeposit and diffuse aluminum and chromium into the platinum-group metal-treated surface. Finally, the superalloy body is removed from the diffusion coating container and heated to the solvus temperature to form a ductile surface having an outer zone microstructure comprising a normally brittle PtAl.sub.2 which has been ductilized by the solutioning therein of beta chromium. This ductilized PtAl.sub.2 may or may not be in a beta phase nickel aluminide matrix depending on substrate composition.
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Rose Bernard R.
Willis John K.
Reiter Howard S.
Walbar Inc.
Yee Deborah
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