Isotropic and nearly isotropic permanent magnet alloys

Details Isotropic and nearly isotropic permanent magnet alloys Isotropic and nearly isotropic permanent magnet alloys

1980-10-17

1982-07-20

Sheehan, John P.

Metal treatment

Compositions

Heat treating

148101, 148120, C04B 3500

Patent

active

043404359

ABSTRACT:
To provide for an inexpensive magnet alloy, isotropic and nearly isotropic permanent magnet properties are developed in Fe-Mo-Ni alloys. Manufacture may be by a method which comprises steps of annealing, optional deforming by a limited amount, and aging.
Typical magnetic properties of alloys of the invention are a coercive force in the range of 50-500 oersted, a magnetic remanence in the range of 7000-14,000 gauss, and a magnetic squareness ratio of less than 0.9. Alloys of the invention are highly ductile even after plastic deformation, they are readily bonded to aluminum supports (as used, e.g., in the manufacture of twistor memories), and they are readily etched by etchants which leave aluminum unaffected.

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H. Matsumoto et al., "Characteristics of Fe-Mo and Fe-W Semihard Magnet Alloys", Journal of the Japanese Institute of Metals, vol. 43, (1979), pp. 506-512.
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W. Koster, "Das System Eisen-Nickel-Molybdan", Archiv fur das Eisenhuttenwesen, vol. 8, No. 4, (Oct. 1934), pp. 169-171.
Metals Handbook, American Society for Metals, vol. 8, p. 431.

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