Metal treatment – Compositions – Heat treating
Patent
1980-10-06
1982-06-29
Sheehan, John P.
Metal treatment
Compositions
Heat treating
75126C, 148 3157, C04B 3500
Patent
active
043371000
ABSTRACT:
Magnetically actuated devices such as, e.g., switches and synchronizers typically comprise a magnetically semihard component having a square B-H hysteresis loop and high remanent induction. Among known alloys having such properties are Co-Fe-V, Co-Fe-Nb, and Co-Fe-Ni-Al-Ti alloys which, however, contain undesirably large amounts of cobalt.
According to the invention, devices are equipped with a magnetically semihard, high-remanence Fe-Cr-Mo alloy which comprises Cr in a preferred amount in the range of 6-26 weight percent and Mo in a preferred amount in the range of 1-12 weight percent. Preparation of alloys of the invention may be by a treatment of annealing, deformation, and aging.
Magnets made from alloys of the invention may be shaped, e.g., by cold drawing, rolling, bending, or flattening and may be used in devices such as, e.g., electrical contact switches, hysteresis motors, and other magnetically actuated devices.
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L. R. Moskowitz, Permanent Magnet Design and Application Handbook, Cahners Books, 1976, pp. 211-220.
M. R. Pinnel, "Magnetic Materials for Dry Reed Contacts", IEEE Transactions on Magnetics, vol. MAG-12, No. 6, Nov. 1976, pp. 789-794.
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E. Scheil et al., "Ausscheidungshartung bei Eisen-Chrom-Molybdan-und Eisen-Chrom-Wolfram-Legierungen", Archiv fur das Eisenhuttenwesen, vol. 7, No. 11, May 1934.
Metals Handbook, American Society for Metals, vol. 8, 1973, pp. 421-422.
Bell Telephone Laboratories Incorporated
Businger Peter A.
Sheehan John P.
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