Method for forming a single-phase nickel aluminide coating on a

Details Method for forming a single-phase nickel aluminide coating on a Method for forming a single-phase nickel aluminide coating on a

1977-08-24

1979-02-27

Esposito, Michael F.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

427405, 427383D, 427252, 427253, C23C 1302

Patent

active

041420233

ABSTRACT:
A method for coating a nickel-base superalloy substrate with a nickel-aluminide coating, saturated with chromium and containing no precipitated phases is disclosed which comprises enriching the superalloy substrate with chromium by diffusion of chromium into the substrate at a rate below that at which a pure or alloyed chromium layer forms and then growing a nickel aluminide coating on the chromium enriched substrate surface by the outward diffusion of nickel from the substrate into an aluminum-containing pack in which the source of aluminum is the stoichiometric intermetallic compound NiAl, or a metal powder mixture having the overall aluminum activity of NiAl.

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Goward et al., "Mechanisms of Formation of Diffusion Aluminide Coatings on Nickel-Base Superalloys", Oxidation of Metals, vol. 3, No. 5, 1971.

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