Title:
希土類磁石の製造方法
Document Type and Number:
Japanese Patent JP5870914
Kind Code:
B2
Abstract:
Provided is a method for manufacturing a rare-earth magnet enabling effective penetrant-diffusion of a melt of modifier alloy powder without generating oxidation reaction or hydroxylation reaction when the modifier alloy powder is used for a better coercive force as well. The method for manufacturing a rare-earth magnet includes: a step of producing a compact S by hot press processing using magnetic powder B including a RE-T-B main phase MP (RE: at least one type of Nd, Pr, and Y) and a grain boundary phase BP around the main phase MP, and performing hot deformation processing to the compact S to produce a rare-earth magnet precursor C; and a step of bringing modifier alloy powder M including a RE-M alloy (M: a metallic element that does not include heavy rare-earth elements) and having an average grain size of 30 μm or more into contact with a surface of the rare-earth magnet precursor C, followed by heating, so that a melt of the modifier alloy powder M is penetrant-diffused into the rare-earth magnet precursor C, to produce the rare-earth magnet RM.
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Inventors:
Kazuaki Haga
Noritaka Miyamoto
Tetsuya Shoji
Sakuma Daisuke
Noritaka Miyamoto
Tetsuya Shoji
Sakuma Daisuke
Application Number:
JP2012280867A
Publication Date:
March 01, 2016
Filing Date:
December 25, 2012
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
H01F41/02; B22F1/00; B22F1/02; B22F3/00; B22F3/24; C22C38/00; H01F1/057; H01F1/08
Domestic Patent References:
| JP2010114200A | ||||
| JP2012234985A | ||||
| JP2011061038A | ||||
| JP5196080B2 |
Foreign References:
| WO2012036294A1 | ||||
| KR1020120135337A | ||||
| CA2811451A1 | ||||
| CN103098155A | ||||
| EP2618349A1 | ||||
| US20130078369 |
Attorney, Agent or Firm:
Yusuke Hiraki
Sekiya Mitsuo
Ishikawa Takiharu
Sekiya Mitsuo
Ishikawa Takiharu