Protective coatings for superalloys

Details Protective coatings for superalloys Protective coatings for superalloys

1975-03-10

1977-05-17

Hoffman, James R.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427250, 427252, C23C 1302

Patent

active

040242943

ABSTRACT:
A protective coating is provided for nickel-base and cobalt-base superalloys which is highly resistant to corrosion and oxidation in a fused Na.sub.2 SO.sub.4 environment at elevated temperatures. The superalloy body is coated by physical vapor deposition with a composition consisting essentially of 50-80% by weight of cobalt and 20-50% by weight of chromium. Optionally, the body may then be coated with an overlayer of aluminum and heat treated to cause interdiffusion of aluminum into the undercoating and thereby enhance the hot corrosion and oxidation resistance of the superalloy body.

REFERENCES:
patent: 2744032 (1956-05-01), Highfield
patent: 2855295 (1958-10-01), Hansel
patent: 3035934 (1962-05-01), Cape
patent: 3050417 (1962-08-01), Nack et al.
patent: 3338733 (1967-08-01), Rowady
patent: 3594219 (1971-07-01), Maxwell et al.
patent: 3620815 (1971-11-01), Blecherman et al.
patent: 3676085 (1972-07-01), Evans et al.
patent: 3846159 (1974-11-01), Bornstein et al.

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