Title:
GRAIN BOUNDARY DIFFUSION MATERIAL, NEODYMIUM-IRON-BORON MAGNET, PREPARATION METHOD THEREFOR, AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2023/024426
Kind Code:
A1
Abstract:
The present invention discloses a grain boundary diffusion material, a neodymium-iron-boron magnet, a preparation method therefor, and the use thereof. The grain boundary diffusion material of the neodymium-iron-boron magnet comprises a diffusion matrix and a diffusion source, wherein the diffusion source is a raw material to be diffused which is added during a grain boundary diffusion treatment, and the diffusion matrix comprises the following components: 29-30 wt.% of LR which is a light rare earth element; 0.15-0.5 wt.% of Cu; 0.99-1.05 wt.% of B; and 67-70 wt.% of Fe, wherein the wt.% is a percentage of the mass of each component to the total mass of the neodymium-iron-boron magnet; the diffusion source comprises Cu and Tb; and the percentage of the mass of Cu in the neodymium-iron-boron magnet to the total mass of the neodymium-iron-boron magnet is greater than 0.5 wt.%. On the premise that the same content of a heavy rare earth element is added to the neodymium-iron-boron magnet prepared from the grain boundary diffusion material of the neodymium-iron-boron magnet in the present invention, the coercive force can be more remarkably improved, and the residual magnetism remains basically unchanged.
Inventors:
LONG YANQING (CN)
LAN QIULIAN (CN)
LI KE (CN)
HUANG JIAYING (CN)
LI SHA (CN)
LAN QIULIAN (CN)
LI KE (CN)
HUANG JIAYING (CN)
LI SHA (CN)
Application Number:
PCT/CN2022/072257
Publication Date:
March 02, 2023
Filing Date:
January 17, 2022
Export Citation:
Assignee:
FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD (CN)
International Classes:
H01F1/057; H01F41/02
Foreign References:
| CN110911149A | 2020-03-24 | |||
| CN112908672A | 2021-06-04 | |||
| JP2011216678A | 2011-10-27 | |||
| CN110444381A | 2019-11-12 | |||
| CN111223625A | 2020-06-02 |
Other References:
ZHOU TOUJUN ET AL.: "Key Laboratory of Rare Earth Magnetic Materials and Devices in Jiangxi province", CHINESE JOURNAL OF RARE EARTH MATERIALS, 21 January 2021 (2021-01-21)
Attorney, Agent or Firm:
SHANGHAI JOINT-WIN LAW FIRM (CN)
Download PDF: