Title:
GRAIN BOUNDARY DIFFUSION MATERIAL, R-T-B MAGNET, AND PREPARATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/124527
Kind Code:
A1
Abstract:
Disclosed are a grain boundary diffusion material, an R-T-B magnet, and a preparation method therefor. The grain boundary diffusion material comprises a diffusion matrix and a diffusion source. The diffusion matrix comprises the following components: 28.5-33.5 wt% of R, R being a rare earth element; 0-0.5 wt% of Ga; 0.9-1.02 wt% of B; and 65-70 wt% of Fe. The diffusion source comprises the following components: 0-70 wt% of HR (but not including 0 wt%), HR being a heavy rare earth element and comprising Dy and/or Tb; greater than or equal to 10 wt% of Ga; 0-10 wt% of Cu; 0-10 wt% of Co; 0-8 wt% of Al; and 0-8 wt% of Fe. Compared with diffusion matrices before grain boundary diffusion, an R-T-B magnet prepared by using the grain boundary diffusion material of the present invention has significantly improved coercivity and temperature stability, and the remanence thereof is basically unchanged.
Inventors:
LIAO ZONGBO (CN)
XIE JUHUA (CN)
WANG RUOSHU (CN)
HUANG JIAYING (CN)
XIE JUHUA (CN)
WANG RUOSHU (CN)
HUANG JIAYING (CN)
Application Number:
PCT/CN2022/129743
Publication Date:
July 06, 2023
Filing Date:
November 04, 2022
Export Citation:
Assignee:
FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD (CN)
International Classes:
H01F1/057; H01F1/055; H01F41/02
Foreign References:
| CN112908672A | 2021-06-04 | |||
| JP2021150547A | 2021-09-27 | |||
| CN108417380A | 2018-08-17 | |||
| CN112509775A | 2021-03-16 | |||
| US20170178778A1 | 2017-06-22 |
Attorney, Agent or Firm:
SHANGHAI JOINT-WIN LAW FIRM (CN)
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