Title:
METHOD FOR PRODUCING RARE EARTH MAGNET, AND RARE EARTH MAGNET
Document Type and Number:
WIPO Patent Application WO/2019/039235
Kind Code:
A1
Abstract:
A method for producing a rare earth magnet, which comprises: a step for preparing a hydrogenated powder which contains a plurality of hydrogenated particles that contain Nd, Fe, Al and B, and which has been subjected to a hydrogenation treatment that is performed in an atmosphere containing hydrogen at a temperature that is not less than the disproportionation temperature; a step for producing a powder molded body by press molding the hydrogenated powder; a step for producing a dehydrogenated product, which has a main phase of an Nd2Fe14B compound and a grain boundary phase that is formed at the grain boundary of the main phase, while containing Nd and Al and having a lower melting point than the main phase, by subjecting the powder molded body to a dehydrogenation treatment in an inert atmosphere or in a reduced pressure atmosphere at a temperature that is not less than the recombination temperature; and a step for covering the main phase by melting the grain boundary phase.
Inventors:
MAEDA TORU (JP)
SHIMAUCHI KAZUNARI (JP)
SHIMAUCHI KAZUNARI (JP)
Application Number:
PCT/JP2018/029220
Publication Date:
February 28, 2019
Filing Date:
August 03, 2018
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
SUMITOMO ELECTRIC SINTERED ALLOY LTD (JP)
SUMITOMO ELECTRIC SINTERED ALLOY LTD (JP)
International Classes:
H01F41/02; B22F1/00; B22F3/00; B22F3/24; H01F1/057; C22C38/00
Foreign References:
| JP2001085256A | 2001-03-30 | |||
| JP2013115156A | 2013-06-10 | |||
| EP3076408A1 | 2016-10-05 |
Attorney, Agent or Firm:
NAKATA Motomi et al. (JP)
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