Title:
希土類磁石前駆体の焼結体を形成する磁性粉体の製造方法
Document Type and Number:
Japanese Patent JP5691989
Kind Code:
B2
Abstract:
A method for producing magnetic powder for forming a sintered body that is a precursor of a rare-earth magnet. Provided is a method for producing magnetic powder for forming a sintered body that is a precursor of a rare-earth magnet, which can produce magnetic powder with a structure containing optimal nanosized crystal grains by accurately and efficiently sorting out magnetic powder containing no coarse grains in the structure thereof. A method for producing magnetic powder p for forming a sintered body S that is a precursor of a rare-earth magnet, the sintered body S including an Nd-Fe-B-based main phase with a nanocrystalline structure, and a grain boundary phase around the main phase, and the rare-earth magnet being adapted to be formed by applying hot deformation processing to the sintered body S for imparting anisotropy thereto and diffusing an alloy for improving coercivity therein, the method including discharging a metal melt onto a chill roll R to produce a quenched ribbon B, and grinding the quenched ribbon B into grains in the size range of 50 to 1000 µm to produce magnetic powder in the mass range of 0.0003 to 0.3 mg; conducting a test to see whether or not the magnetic powder in the mass range adsorbs onto a magnet with a surface magnetic flux density of 2 mT or less, and sorting out magnetic powder p that has not adsorbed onto the magnet, as the magnetic powder for forming the sintered body S.
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Inventors:
Sakuma Koji
Hidefumi Kishimoto
Noritaka Miyamoto
Akira Kato
Akira Manabe
Daisuke Ichizaki
Tetsuya Shoji
Harukawa Shoichi
Hidefumi Kishimoto
Noritaka Miyamoto
Akira Kato
Akira Manabe
Daisuke Ichizaki
Tetsuya Shoji
Harukawa Shoichi
Application Number:
JP2011224115A
Publication Date:
April 01, 2015
Filing Date:
October 11, 2011
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
H01F41/02; B22F1/00; C22C33/02; H01F1/057; H01F1/08
Domestic Patent References:
| JP2010114200A | ||||
| JP64015317A | ||||
| JP6154646A | ||||
| JP2011159733A | ||||
| JP2007270164A | ||||
| JP5135919A | ||||
| JP11238612A | ||||
| JP2011100881A |
Other References:
日置敬子,服部篤,超急冷粉末を原料とした省Dy型Nd-Fe-B系熱間加工磁石の開発,素形材,日本,財団法人素形材センター,2011年 8月20日,第52巻 第8号,p.19-24
Attorney, Agent or Firm:
Yusuke Hiraki
Sekiya Mitsuo
Ishikawa Takiharu
Sekiya Mitsuo
Ishikawa Takiharu