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Title:
METHOD OF PRODUCING RARE-EARTH MAGNET
Document Type and Number:
Japanese Patent JP2014127491
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method of producing a rare-earth magnet in which the melt of a modified alloy powder can be diffused, without causing oxidization reaction or hydroxylation reaction, even when the modified alloy powder is used for enhancing the coercive force.SOLUTION: A method of producing a rare-earth magnet comprises: a step of producing a molding S by performing hot press working by using the main phase MP(RE:at least one kind of Nd, Pr, Y) of RE-T-B system, and magnetic powder consisting of a grain boundary phase BP around the main phase MP, and then producing a rare-earth magnet precursor C by performing hot plasticity processing of the molding S; and a step of producing a rear-earth magnet by bringing the modified alloy powder composed of an RE-M alloy (M:a metal element not containing heavy rare-earth element), and having an average grain size of 30 μm or more into contact with the surface of the rare-earth magnet precursor C, and diffusing the melt of modified alloy powder into the rare-earth magnet precursor C by heating.

Inventors:
HAGA KAZUAKI
MIYAMOTO NORITAKA
SHOJI TETSUYA
SAKUMA DAISUKE
Application Number:
JP2012280867A
Publication Date:
July 07, 2014
Filing Date:
December 25, 2012
Export Citation:
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Assignee:
TOYOTA MOTOR CORP
International Classes:
H01F41/02; B22F1/00; B22F1/02; B22F3/00; B22F3/24; C22C38/00; H01F1/057; H01F1/08
Domestic Patent References:
JP5196080B22013-05-15
JP2010114200A2010-05-20
JP2012234985A2012-11-29
JP2011061038A2011-03-24
JP5196080B22013-05-15
Foreign References:
KR20120135337A2012-12-12
CA2811451A12012-03-22
CN103098155A2013-05-08
EP2618349A12013-07-24
US20130078369A12013-03-28
WO2012036294A12012-03-22
KR20120135337A2012-12-12
CA2811451A12012-03-22
CN103098155A2013-05-08
EP2618349A12013-07-24
US20130078369A12013-03-28
Attorney, Agent or Firm:
Yusuke Hiraki
Sekiya Mitsuo
Ishikawa Takiharu



 
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