Title:
METHOD FOR MANUFACTURING RARE EARTH PERMANENT MAGNET
Document Type and Number:
WIPO Patent Application WO/2023/210842
Kind Code:
A1
Abstract:
A method for manufacturing a rare earth permanent magnet according to the present invention comprises: a step of preparing a rare earth sintered magnet (hereinafter referred to as a "base material") of Re-Fe-TM-B (Re=rare earth element, Fe=iron, TM=3d transition metal, and B=boron); a step of preparing a rare earth compound slurry and an additive; a step of preparing a coating agent by mixing and stirring the rare earth compound slurry and the additive; a coating step of coating the surface of the base material with the coating agent; a grain boundary diffusion step of heating the sintered magnet coated with the rare earth compound to diffuse the grain boundary; and heat-treating the grain boundary-diffused sintered magnet.
Inventors:
AHN JONGBIN (KR)
HWANG JINSUNG (KR)
HWANG JINSUNG (KR)
Application Number:
PCT/KR2022/006141
Publication Date:
November 02, 2023
Filing Date:
April 29, 2022
Export Citation:
Assignee:
DAE IL CORP (KR)
International Classes:
B22F3/10; H01F41/02; C22C1/04; H01F1/053
Foreign References:
| KR20190125769A | 2019-11-07 | |||
| JP2020198382A | 2020-12-10 | |||
| KR20190064764A | 2019-06-11 | |||
| US20190385790A1 | 2019-12-19 | |||
| EP2348518B1 | 2016-08-24 |
Attorney, Agent or Firm:
SMART PATENT LAW FIRM (KR)
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