ANISOTROPIC RARE EARTH BONDED MAGNET AND PRODUCTION METHOD THEREFOR

WIPO Patent Application WO/2012/017574

A1

Although anisotropic rare earth bonded magnets have superior magnetic properties to isotropic bonded magnets, there are currently issues with temperature properties, corrosion resistance, and magnet costs, and mass production is not widespread. Meanwhile, although methods are available for recycling sintered magnet scrap, such as dissolving and alloying scrap to obtain magnet alloys, and using oxide reduction, separation of SmCo and Nd magnets is unavoidable, and scrap must first be returned to a rare earth oxide state. A low-cost, highly-efficient recycling method has currently not been found. The present invention proposes a novel anisotropic rare earth bonded and a production method therefor that utilize this sintered magnet scrap to produce magnets that are superior to commercially-available isotropic bonded magnets, and that are easy on the environment due to energy saving and resource conservation. Anisotropic rare earth bonded magnets are produced by means of crushing, strain relief annealing heat treatment, kneading, and magnetic field forming.

JPH08167512	RESIN BOUND MAGNET AND MAGNETIC RAW MATERIAL
JP2623731	[Title of the Invention] A method for producing a rare earth-Fe-B-based anisotropic permanent magnet.
JPS6286803	MANUFACTURE OF COMPOUND MAGNET

YAMAMOTO HITOSHI (JP)

PCT/JP2011/001857

February 09, 2012

March 29, 2011

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KRI INC (JP)
YAMAMOTO HITOSHI (JP)

H01F1/08; B22F1/00; B22F3/00; C22C38/00; H01F1/053; H01F41/00; H01F41/02

JP2002367820A	2002-12-20
JP2006274344A	2006-10-12
JP2009231391A	2009-10-08
JPS5816002A	1983-01-29

KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)

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