RARE EARTH PERMANENT MAGNET AND METHOD FOR MANUFACTURING RARE EARTH PERMANENT MAGNET

Title:

RARE EARTH PERMANENT MAGNET AND METHOD FOR MANUFACTURING RARE EARTH PERMANENT MAGNET

Document Type and Number:

WIPO Patent Application WO/2012/176513

Kind Code:

A1

Abstract:

Provided are a rare earth permanent magnet and a method for manufacturing the rare earth permanent magnet, whereby the thickness precision of a green sheet is improved, enabling productivity to be improved. A magnetic material is pulverized into a magnetic powder, and the pulverized magnetic powder is mixed with a binder to produce a mixture containing a binder of 1 wt% to 40 wt%. A sheet-like green sheet having a precise thickness within ±5% of a set value is then manufactured by coating a substrate in a highly precise manner with the mixture that was produced. Next, the manufactured green sheet is maintained at a binder-decomposing temperature for a fixed time in a non-oxidizing atmosphere, causing the binder to decompose into monomers due to a depolymerization reaction, or the like, and scatter, thereby removing the binder. A permanent magnet (1) is then manufactured by sintering the green sheet, from which the binder has been removed, by means of a pressure sintering technique such as spark plasma sintering.

Inventors:

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

Application Number:

PCT/JP2012/056713

Publication Date:

December 27, 2012

Filing Date:

March 15, 2012

Export Citation:

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Assignee:

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

International Classes:

H01F1/08; B22F3/22; C22C33/02; C22C38/00; H01F1/057; H01F41/02

Foreign References:

JP2009259955A	2009-11-05
JP2007296502A	2007-11-15
JP2005197299A	2005-07-21
JP2007134417A	2007-05-31
JP2005203555A	2005-07-28
JPH01150303A	1989-06-13

Other References: