Method of manufacturing rare earth-iron bond magnet

Details Method of manufacturing rare earth-iron bond magnet Method of manufacturing rare earth-iron bond magnet

2005-12-27

2005-12-27

Arbes, Carl J. (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S566000, C029S602100, C029S602100, C029S732000, C075S230000, C148S101000, C148S302000, C264S112000, C264S122000

Reexamination Certificate

active

06978533

ABSTRACT:
A powder molded magnet manufactured by a method comprising the steps of: (1) forming a granular compound of diameter of not more than 250 μm with a rare earth-iron rapid-quenched flake, which has not more than 150 μm in diameter, being coarsely ground if necessary, and a binder, (2) dry-blending the granular compound with fatty acid metallic soap powder, (3) forming compressed powder from the granular compound dry-blended with the fatty acid metallic soap powder, by powder molding, and (4) heat-treating the compressed powder to a temperature higher than a thermally dissociating temperature of stabilized isocyanate.

REFERENCES:
patent: 4902361 (1990-02-01), Lee et al.
patent: 5149477 (1992-09-01), Yamashita et al.
patent: 5300156 (1994-04-01), Mohri et al.
patent: 5-94922 (1993-04-01), None
patent: 6-236807 (1994-08-01), None
patent: 10-32134 (1998-02-01), None
J.F. Herbst et al., “Rare Earth-Iron-Boron Material: A New Era in Permanent Magnets”, Ann. Rev. Mater. Sci., 1986, 16, pp. 467-485.

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