Oxide whisker growth on contaminated aluminum-containing stainle

Details Oxide whisker growth on contaminated aluminum-containing stainle Oxide whisker growth on contaminated aluminum-containing stainle

1984-12-03

1986-05-13

Hoffman, James R.

Metal treatment

Compositions

Heat treating

148 63, C23C 1110, C23C 1111, C23C 806

Patent

active

045884498

ABSTRACT:
In aluminum-containing stainless steel foil, the presence of magnesium impurity in an amount greater than about 0.002 weight percent has been found to inhibit formation of a preferred oxide surface layer characterized by multitudinous oxide whiskers of a type suitable for tightly bonding an applied coating. A method for purifying magnesium-contaminated foil comprises heating the foil to selectively vaporize the magnesium while avoiding incipient melting of the base alloy, preferably between about 1000.degree. C. and 1150.degree. C. The magnesium vapors escape into a suitable ambient phase such as a vacuum or a dry hydrogen gas. Thereafter, the foil is oxidized under conditions effective to produce the desired whiskers. A preferred steel is composed of an iron-base alloy comprising about 15 to 25 weight percent chromium and 3 to 6 weight percent aluminum, and optionally may contain cerium or yttrium in an amount effective to promote oxide adherence.

REFERENCES:
patent: 4318828 (1982-03-01), Chapman
patent: 4331631 (1982-05-01), Chapman et al.
Golightly et al., "The Influence of Yttrium Additions on the Oxide-Scale Adhesion to an Iron-Chromium-Aluminum Alloy" Oxidation of Metals, vol. 10, No. 3, 1976, pp. 163-187.
Golightly et al., "The Early Stages of Development of Alpha-Al.sub.2 O.sub.3 Scales on Fe-Cr-Al and Fe-Cr-Al-Y Alloys at High Temperature", Oxidation of Metals, vol. 14, No. 3, 1980, pp. 217-234.
American Society for Metals, Heat Treating, Metals Handbook, 9th Edition, vol. 4, pp. 307-311.

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