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

1976-09-01

1978-04-25

Steiner, Arthur J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428628, 428668, 427 34, 427250, B32B 1518

Patent

active

040863913

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: 3528861 (1970-09-01), Elam et al.
patent: 3914507 (1975-10-01), Fastukian
patent: 3918139 (1975-11-01), Felten
patent: 3951642 (1976-04-01), Chang et al.
patent: 3961098 (1976-06-01), Bessen
patent: 3976436 (1976-08-01), Chang

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