Method of producing Fe/Cr/Co permanent magnet alloy

Details Method of producing Fe/Cr/Co permanent magnet alloy Method of producing Fe/Cr/Co permanent magnet alloy

Filed on

1979-12-12

Date issued

1981-12-15

Examiner

Rutledge, L. Dewayne

Patent Class

Metal treatment

SubClass

Process of modifying or maintaining internal physical...

SubSubClass

Magnetic materials

Other Related Categories

148102, 148108, 148121, 148 3157, H01F 102

Type

Patent

Status

active

Patent number

043057640

Description

ABSTRACT:
A method of producing an anisotropic magnet alloy containing iron, chromium and cobalt as the major constituents. The method has a step of aging treatment of the alloy in a magnetic field for permanentally magnetizing the alloy. The aging treatment in the magnetic field is conducted by at first treating the alloy at a temperature below the two-phase separation temperature of the alloy, under application of the magnetic field, thereby to form an anisotropic two-phase separated microstructure, and cooling the alloy continuously at a rate which is not so great, while maintaining the application of the magnetic field, thereby to make the two separated phases approach the equilibrium structures at lower temperature. By so doing, the undesirable disorder of anisotropy is avoided because the magnetic field is maintained to order the two-phase separated microstructure even if a new two-phase separated microstructure is formed during the cooling.

REFERENCES:
patent: 3954519 (1976-05-01), Inoue
patent: 3982972 (1976-09-01), Iwata et al.
patent: 4008105 (1977-02-01), Yuda et al.
patent: 4093477 (1978-06-01), Iwata et al.
patent: 4194932 (1980-03-01), Iwata
Kaneko et al., IEEE Trans. on Magnetics, vol. MAG-12, No. 6, Nov. 1976, pp. 977-979.
Kaneko et al., IEEE Trans. on Magnetics, vol. MAG-11, No. 5, Sep. 1975, pp. 1440-1442.
English language abstract of Japanese Patent Laid-Open Publication No. 79631/1976; Abstract No. 65503.

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