Oxidation resistant superalloy single crystals

Details Oxidation resistant superalloy single crystals Oxidation resistant superalloy single crystals

1987-10-05

1989-11-07

Dean, R.

Metal treatment

Stock

Directionally solidified

148410, 148428, C22C 1905

Patent

active

048789658

ABSTRACT:
Compositions and articles are described which have particular utility in gas turbine engine parts and which can be used at temperatures up to and in excess of 2,000.degree. F. without the usual protective coatings. Compositions are described which can be formed into single crystal articles which are alumina formers upon exposure to oxidation and in which develop an adherent spall resistant alumina scale during oxidation. The adherence and spall resistance of the alumina surface scale results from the presence of a small but critical quantity of zirconium.

REFERENCES:
patent: 3494709 (1970-02-01), Piearcey
patent: 4340425 (1982-07-01), Barrett et al.
patent: 4459160 (1984-07-01), Meetham et al.
The Superalloys, John Wiley & Sons, 1972.

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