Title:
HIGH-COERCIVITY NEODYMIUM-CERIUM-IRON-BORON PERMANENT MAGNET AS WELL AS PREPARATION METHOD THEREFOR AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2023/124687
Kind Code:
A1
Abstract:
Disclosed are a high-coercivity neodymium-cerium-iron-boron permanent magnet as well as a preparation method therefor and the use thereof. The permanent magnet has at least one of the following features: the area of grain boundary RE-rich phases in the magnet accounts for 4% or more of the area of a whole field of view; the grain boundary RE-rich phases in the magnet are fine and uniformly distributed; and the mean value of ratios of the area of block-shaped grain boundary RE-rich phases located at intersections of three or more main-phase grains to the total area of all the three or more adjacent main-phase grains in the vicinity is less than or equal to 30%. When used as a grain boundary diffusion magnet base material, the magnet prepared in the present invention has an excellent diffusion effect. As the RE-rich phases in the magnet are continuously distributed along grain boundaries, more channels are provided for diffusion, thereby helping to increase the depth of diffusion of a diffusion source into the magnet, improve the uniformity of distribution of the diffusion source in the magnet and improve the consistency of internal structure components of the diffusion magnet, and thus further improving the magnetic performance of the diffusion magnet.
Inventors:
YU YONGJIANG (CN)
AN ZHONGXIN (CN)
LIU LEI (CN)
ZHANG CONGCONG (CN)
GENG GUOQIANG (CN)
AN ZHONGXIN (CN)
LIU LEI (CN)
ZHANG CONGCONG (CN)
GENG GUOQIANG (CN)
Application Number:
PCT/CN2022/134599
Publication Date:
July 06, 2023
Filing Date:
November 28, 2022
Export Citation:
Assignee:
YANTAI ZHENGHAI MAGNETIC MAT CO LTD (CN)
International Classes:
H01F1/057; H01F41/02
Foreign References:
| CN114284019A | 2022-04-05 | |||
| CN110537232A | 2019-12-03 | |||
| CN106057391A | 2016-10-26 | |||
| CN113674945A | 2021-11-19 | |||
| CN107146674A | 2017-09-08 | |||
| CN108183010A | 2018-06-19 | |||
| JP2016115774A | 2016-06-23 |
Attorney, Agent or Firm:
BEIJING ORIGINTELLIGENCE IP LAW FIRM (CN)
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