Protective coatings for superalloys

Details Protective coatings for superalloys Protective coatings for superalloys

1975-03-27

1976-12-21

Hoffman, James R.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

427250, C23C 1302, B32B 1520

Patent

active

039986039

ABSTRACT:
A protective coating is provided for nickel-base and cobalt-base superalloys which is highly resistant to corrosion in a fused Na.sub.2 SO.sub.4 environment at elevated temperatures. The superalloy body is coated by physical vapor deposition with a thin layer of nickel-chromium alloy and then coated with a still thinner layer of aluminum and thereafter heat treated to strengthen the body and improve its rupture life while bonding the alloy coating to the body and diffusing the aluminum coating into the alloy coating and forming a chromium diffusion barrier in the nickel-chromium layer.

REFERENCES:
patent: 3050417 (1962-08-01), Nack et al.
patent: 3338733 (1967-08-01), Rowady
patent: 3594219 (1971-07-01), Maxwell et al.
patent: 3640815 (1972-02-01), Schwartz et al.
patent: 3652235 (1972-03-01), Manilla et al.
patent: 3676085 (1972-07-01), Evans
patent: 3846159 (1974-11-01), Bornstein et al.

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