PERMANENT MAGNET AND MANUFACTURING METHOD FOR PERMANENT MAGNET

Title:

PERMANENT MAGNET AND MANUFACTURING METHOD FOR PERMANENT MAGNET

Document Type and Number:

WIPO Patent Application WO/2011/125591

Kind Code:

A1

Abstract:

Disclosed are a permanent magnet and a manufacturing method for the permanent magnet in which the amount of carbon contained in the magnet grains can be pre-reduced before sintering, even when using wet milling. Coarsely pulverized magnet powder and an organometallic compound represented by the formula M-(OR)x are pulverized in a solvent by a bead mill, uniformly depositing the organometallic compound on the surface of the magnet grains. Afterwards, calcination in hydrogen is carried out by retaining a molded article, formed by powder compacting, in a hydrogen atmosphere for several hours at 200℃-900℃. Afterwards, a permanent magnet (1) is manufactured by sintering. (In the formula, M includes at least one among the rare earth elements Nd, Pr, Dy, Tb. R is a substituent group comprising a hydrocarbon, and can be a straight chain or a branched chain. x is an arbitrary integer.)

Inventors:

OZEKI IZUMI (JP)
KUME KATSUYA (JP)
HIRANO KEISUKE (JP)
OMURE TOMOHIRO (JP)
TAIHAKU KEISUKE (JP)
OZAKI TAKASHI (JP)

Application Number:

PCT/JP2011/057572

Publication Date:

October 13, 2011

Filing Date:

March 28, 2011

Export Citation:

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Assignee:

NITTO DENKO CORP (JP)
OZEKI IZUMI (JP)
KUME KATSUYA (JP)
HIRANO KEISUKE (JP)
OMURE TOMOHIRO (JP)
TAIHAKU KEISUKE (JP)
OZAKI TAKASHI (JP)

International Classes:

B22F1/02; H01F1/08; B22F3/00; B22F9/04; C22C33/02; C22C38/00; H01F1/053; H01F41/02

Domestic Patent References:

WO2009116532A1

2009-09-24

Foreign References:

JP2005191187A	2005-07-14
JPH1064746A	1998-03-06
JP3298219B2	2002-07-02

Other References: