Gallium-containing magnet for a motor

Details Gallium-containing magnet for a motor Gallium-containing magnet for a motor

1988-09-08

1990-10-02

Morris, Theodore

Metal treatment

Stock

Magnetic

H01F 1053

Patent

active

049604740

ABSTRACT:
In a magnetically anisotropic magnet for use in a motor, comprising at least one rare earth element (R), Fe and boron (B), said magnet having fine crystal grains, the improvement comprising Ga added in the magnet so that the magnet has a surface magnification of not less than 6, a residual magnetic flux density in the direction of easy magnetization of not less than 11 kG and a coercive force of not less than 12 kOe.
The invention also provide a method of producing the magnetically anisotropic magnet for use in a motor, comprising the steps of: forming flakes by rapid quenching a molten alloy consisting of at least one rare earth element (R), Fe, boron (B) and an optical metal element (M); compacting the flakes to provide a green compact; and warm plastic working the green compact at a temperature between 600.degree. C. and 800.degree. C. at a strain rate of 0.0001 to 0.1 per second with a plastic working ratio (ho/h) of not less than 2.

REFERENCES:
patent: 4374665 (1983-02-01), Koon
patent: 4827235 (1989-05-01), Imomata et al.
Hadjipanayis, G. C., et al., "Cobalt Free Permanent Magnet Materials Based on Iron-Rare-Earth Alloys", Journal of Applied Physics, 55(6), Mar. 15, 1984.

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