Method for the preparation of rare earth-base permanent magnet

Details Method for the preparation of rare earth-base permanent magnet Method for the preparation of rare earth-base permanent magnet

1990-07-19

1991-02-12

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder shape or size characteristics

419 29, 419 33, 419 38, 419 54, 419 12, 75244, 252 6255, B22F 300

Patent

active

049922343

ABSTRACT:
An improved method is proposed for the preparation of a sintered permanent magnet of a rare earth-iron-boron alloy having remarkably improved magnetic properties and stability by the powder metallurgical process. The scope of the inventive method consists in the particle size classification of the alloy powder for compression molding into a powder compact to be sintered, by which particles having a finer particle diameter and, preferably, a coarser particle diameter than the respective critical values are removed so as to effectively prevent oxidation of the too fine particles and improving the magnetic orientation of the particles as well as the sintering behavior of the particles.

REFERENCES:
patent: 4601875 (1986-07-01), Yamamato et al.
patent: 4614637 (1986-09-01), Boncoeur et al.
patent: 4814139 (1989-03-01), Tokunaga et al.
patent: 4826546 (1989-05-01), Yamamoto et al.
patent: 4888068 (1989-12-01), Tokunaga et al.

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