Title:
Ｒ−Ｔ−Ｂ系焼結磁石の製造方法
Document Type and Number:
Japanese Patent JP6443584
Kind Code:
B2
Abstract:
An application step of applying an adhesive agent to an application area of a surface of a sintered R-T-B based magnet work, an adhesion step of allowing a particle size-adjusted powder that is composed of a powder of an alloy or a compound of a Pr-Ga alloy which is at least one of Dy and Tb to the application area of the surface of the sintered R-T-B based magnet work, and a diffusing step of heating it at a temperature which is equal to or lower than a sintering temperature of the sintered R-T-B based magnet work to allow the Pr-Ga alloy contained in the particle size-adjusted powder to diffuse from the surface into the interior of the sintered R-T-B based magnet work are included. The particle size of the particle size-adjusted powder is set so that, when powder particles composing the particle size-adjusted powder are placed on the entire surface of the sintered R-T-B based magnet work to form a particle layer which is not less than one layer and not more than three layers, the amount of Ga contained in the particle size-adjusted powder is in a range from 0.10 to 1.0% with respect to the sintered R-T-B based magnet work by mass ratio.
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Inventors:
Kuniyoshi Ta
Shuji Mino
Shuji Mino
Application Number:
JP2018511502A
Publication Date:
December 26, 2018
Filing Date:
September 26, 2017
Export Citation:
Assignee:
Hitachi Metals Co., Ltd.
International Classes:
H01F41/02; B22F1/00; B22F1/05; B22F3/00; B22F3/02; B22F3/24; C22C28/00; C22C38/00; H01F1/057
Domestic Patent References:
| JP2012234971A | ||||
| JP2016129217A | ||||
| JP2004027313A |
Foreign References:
| WO2016133071A1 |
Attorney, Agent or Firm:
Seiji Okuda
Osamu Kita
Michi Kajitani
Osamu Kita
Michi Kajitani