Title:
METHOD FOR PRODUCING RARE EARTH MAGNET AND RARE EARTH MAGNET
Document Type and Number:
WIPO Patent Application WO/2017/086268
Kind Code:
A1
Abstract:
This method for producing a rare earth magnet comprises: a preparation step for preparing an Sm-Fe based alloy having an SmFe9+α phase as a main phase by quenching a molten alloy in which the atomic ratio of Sm and Fe is 1:8.75-1:12; a hydrogenation step for hydrogenating the Sm-Fe based alloy to cause phase decomposition such that a part of the SmFe9+α phase (α=0.1 to 3.0) is decomposed into SmH2 and Fe; a molding step for obtaining a molded body by pressure-molding the hydrogenated Sm-Fe based alloy; a dehydrogenation step for dehydrogenating the molded body to re-combine SmH2 and Fe obtained by the phase decomposition at the hydrogenation step; and a nitriding step for nitriding the dehydrogenated molded body, wherein, in the Sm-Fe based alloy at the preparation step, an integrated diffraction peak intensity Int (Fe) of the (110) plane of αFe by X-ray diffraction is equal to or less than one-ninth, in terms of the integrated intensity ratio, of an integrated maximum diffraction peak intensity Int (SmFe) within a range of 2θ=30° to 50°.
Inventors:
EGASHIRA SHIGEKI (JP)
SHIMAUCHI KAZUNARI (JP)
MAEDA TORU (JP)
SHIMAUCHI KAZUNARI (JP)
MAEDA TORU (JP)
Application Number:
PCT/JP2016/083679
Publication Date:
May 26, 2017
Filing Date:
November 14, 2016
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
International Classes:
H01F41/02; B22F1/00; B22F1/05; B22F3/00; B22F9/04; C22C38/00; H01F1/059
Foreign References:
| JP2012241280A | 2012-12-10 | |||
| JP2015128118A | 2015-07-09 | |||
| JP2015026795A | 2015-02-05 | |||
| JP2015008233A | 2015-01-15 | |||
| JPH10312918A | 1998-11-24 | |||
| JP2015128118A | 2015-07-09 |
Other References:
See also references of EP 3379550A4
Attorney, Agent or Firm:
NAKATA, Motomi et al. (JP)
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