Title:
METHOD FOR PRODUCING RARE EARTH MAGNET
Document Type and Number:
WIPO Patent Application WO/2019/049691
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, Cu and B and are hydrogenated in an atmosphere containing hydrogen at a temperature that is not less than the disproportionation temperature; a step for producing a powder compact by press molding the hydrogenated powder; a step for producing a dehydrogenated body by dehydrogenating the powder compact in an inert atmosphere or in a reduced pressure atmosphere at a temperature that is not less than the recombination temperature, said dehydrogenated body having a main phase of an Nd2Fe14B compound and an intergranular phase that is formed at the grain boundary of the main phase and contains Nd and Cu, while having a lower melting point than the main phase; and a step for recrystallizing the intergranular phase by melting the intergranular phase so that the intergranular phase reacts with the main phase.
Inventors:
MAEDA TORU (JP)
SHIMAUCHI KAZUNARI (JP)
HIRAI KEI (JP)
SHIMAUCHI KAZUNARI (JP)
HIRAI KEI (JP)
Application Number:
PCT/JP2018/031372
Publication Date:
March 14, 2019
Filing Date:
August 24, 2018
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
International Classes:
H01F41/02; B22F1/00; B22F3/00; H01F1/057; C22C38/00
Foreign References:
| JP2015220335A | 2015-12-07 | |||
| JP2014160729A | 2014-09-04 | |||
| JP2014165228A | 2014-09-08 | |||
| JP2001085256A | 2001-03-30 |
Attorney, Agent or Firm:
NAKATA Motomi et al. (JP)
Download PDF: