Magnetically anisotropic permanent magnet

Details Magnetically anisotropic permanent magnet Magnetically anisotropic permanent magnet

1995-05-05

1996-12-03

Sheehan, John

Metal treatment

Stock

Magnetic

75244, 252 6254, H01F 1057

Patent

active

055804004

ABSTRACT:
The present invention aims at providing a powdery raw material composition for a permanent magnet superior in the magnetic properties and easy in preparation, a magnetically anisotropic permanent magnet, and a method for producing the magnet by use of the powdery raw material composition. A powdery raw material composition for a permanent magnet according to the present invention is one prepared by subjecting a mixture composed of 13-18 weight % of a neodymium powder, 4-10 weight % of a boron powder and the rest of an acicular iron powder coated with aluminum phosphate to a temperature above 600.degree. C. in an atmosphere initially of a hydrogen-containing reducing gas followed later by an inert gas, and a magnetically anisotropic permanent magnet is prepared by compression molding a mixture obtained from the powdery composition and a binder under heating in the presence of a magnetic field.

REFERENCES:
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patent: 4663066 (1987-05-01), Fruchart et al.
patent: 4668283 (1987-05-01), Honda et al.
patent: 4913890 (1990-04-01), Arndt et al.
patent: 5034146 (1991-07-01), Ohashi et al.
Teitaro Hiraga et al., "Ferrite", Maruzen 1988, p. 45 (translation was attached).

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