Alumina forming coatings containing hafnium for high temperature

Details Alumina forming coatings containing hafnium for high temperature Alumina forming coatings containing hafnium for high temperature

1975-06-23

1976-11-23

Rutledge, L. Dewayne

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

75134F, 75171, C22C 1900

Patent

active

039934543

ABSTRACT:
Coatings are described which are particularly suited for the protection of nickel and cobalt superalloy articles at elevated temperatures. The protective nature of the coatings is due to the formation of an alumina layer on the surface of the coating which serves to reduce oxidation/corrosion. The coatings contain aluminum, chromium, and one metal chosen from the group consisting of nickel and cobalt or mixtures thereof. The coatings further contain a small controlled percentage of hafnium which serves to greatly improve the adherence and durability of the protective alumina film on the surface of the coating.

REFERENCES:
patent: 3676085 (1972-07-01), Evans et al.
patent: 3754903 (1973-08-01), Goward et al.
patent: 3918139 (1975-11-01), Felten
patent: 3928026 (1975-12-01), Hecht et al.

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