Diffusion aluminizing of cobalt-base superalloys

Details Diffusion aluminizing of cobalt-base superalloys Diffusion aluminizing of cobalt-base superalloys

1983-11-07

1985-07-09

Childs, S. L.

Coating processes

Coating by vapor, gas, or smoke

Metal coating

427253, C23C 1100, C23C 1300

Patent

active

045282153

ABSTRACT:
In the pack diffusion coating of chromium into the surface of a superalloy, the formation of undesirable oxide inclusion is reduced when the diffusion coating pack contains at least about 3% Ni.sub.3 Al. Also the formation of alpha-chromium is reduced when the pack diffusion is carried out in a retort effectively not over five inches in height. On the other hand an alpha-chromium-rich layer at least 0.2 mil thick can be deliberately formed and the superalloy thus coated subjected to an aluminizing treatment to convert the alpha-chromium into islands that provide very high sulfidation resistance. Pack aluminizing in the presence of chromium makes a very effective aluminum- or chromium-containing top coating over platinum plated or platinum coated nickel-base superalloys. Depletion of diffusible material from workpieces heated in a powder-pack can also provide a surface on which aluminizing produces a highly impact-resistant coating.

REFERENCES:
patent: 3079276 (1963-02-01), Puyear et al.
patent: 3594219 (1971-07-01), Maxwell et al.
patent: 3801357 (1974-04-01), Baldi

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