Low activity localized aluminide coating

Details Low activity localized aluminide coating Low activity localized aluminide coating

1997-11-18

2000-04-04

King, Roy V.

Coating processes

Coating by vapor, gas, or smoke

Metal coating

427252, 427142, 427287, C23C 1606, C23C 1608

Patent

active

060458631

ABSTRACT:
The invention includes a low activity localized aluminide coating for a metallic article made by positioning a coating material, preferably in the form of a tape, on a portion of the article. The coating material comprises a binder, a halide activator, an aluminum source, and an inert ceramic material. The coating material and the article are heated in an inert atmosphere between about 1800.degree. F. (982.degree. C.) and about 2050.degree. F. (1121.degree. C.) for between about four and about seven hours thereby producing a low activity localized aluminide coating having an outward diffusion aluminide coating microstructure characterized by two distinct zones, an inner diffusion zone and an outer zone including between about 20-28 percent, by weight, aluminum.

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G. W. Goward, D. H. Boone and C. S. Griggins "Formation and Degradation Mechanisms of Aluminide Coatings on Nickel-Base Superalloys", Transactions of the ASM, vol. 60, No month data!! 1967, pp. 228-241.

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