Rare earth-iron-boron permanent magnet and method for the prepar

Details Rare earth-iron-boron permanent magnet and method for the prepar Rare earth-iron-boron permanent magnet and method for the prepar

1998-12-22

1999-07-27

Jenkins, Daniel J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 33, 419 38, B22F 312, B22F 100

Patent

active

059305827

ABSTRACT:
Disclosed is a method for the preparation of a novel composite rare earth-based magnetically anisotropic sintered permanent magnet in which: (a) a base alloy consisting of a host phase of R.sub.2 T.sub.14 B (R: a rare earth element; T: iron or a combination of iron and cobalt) having a particle diameter of 2 to 10 .mu.m and containing in each particle a phase rich in the content of T and having a particle diameter not exceeding 1 .mu.m is prepared by the strip casting method; (b) the base alloy is crushed; (c) the base alloy powder is blended in a specified proportion with a powder of an auxiliary alloy of R-T or R-T-B in a specified proportion; (d) the powder blend is subjected to further comminution; (e) the comminuted powder blend is subjected to compression-molding in a magnetic field into a powder compact; and (f) the powder compact is sintered by a heat treatment.

REFERENCES:
patent: 4992234 (1991-02-01), Ohashi et al.
patent: 4996023 (1991-02-01), Flipse et al.
patent: 5091020 (1992-02-01), Kim
patent: 5098649 (1992-03-01), Matsumoto et al.
patent: 5143560 (1992-09-01), Doser
patent: 5167914 (1992-12-01), Fujimura et al.
patent: 5443787 (1995-08-01), Mori et al.

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