Title:
METHOD FOR PREPARING HIGH-PERFORMANCE NEODYMIUM-IRON-BORON MAGNET THROUGH SOLID-LIQUID PHASE SEPARATION DIFFUSION PROCESS
Document Type and Number:
WIPO Patent Application WO/2023/116234
Kind Code:
A1
Abstract:
The present invention provides a method for preparing a high-performance neodymium-iron-boron magnet through a solid-liquid phase separation diffusion process. The magnet attached with a diffusion source is subjected to primary liquid phase diffusion heat treatment, the temperature is higher than the melting point of an auxiliary alloy B and smaller than or equal to 600°C, and the duration is 30-80 hours; then secondary solid-phase diffusion heat treatment is performed, wherein the temperature is 800°C to 900°C, and the duration is 0.5-3 hours; and finally, annealing heat treatment is performed, wherein the temperature is 400-500°C, and the duration is 3-5 hours. The magnet is prepared from a main-phase alloy A, namely RaFe100-a-bBb and the auxiliary alloy B, namely RcM100-c, wherein R is Pr20Nd80 or Pr25Nd75 alloy, M is one or more of Al, Cu, Zn, Co and Ni, and a, b and c are weight percentage content×100 and meet: 26≤a≤32, 0.9≤b≤1.1, and 55≤c≤95; and the melting point of the auxiliary alloy B is lower than 600°C.
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Inventors:
YUE MING (CN)
WANG ZHANJIA (CN)
LIU WEIQIANG (CN)
WU HAIHUI (CN)
WANG ZHANJIA (CN)
LIU WEIQIANG (CN)
WU HAIHUI (CN)
Application Number:
PCT/CN2022/129824
Publication Date:
June 29, 2023
Filing Date:
November 04, 2022
Export Citation:
Assignee:
UNIV BEIJING TECHNOLOGY (CN)
International Classes:
H01F41/02; H01F1/057
Foreign References:
| CN114334416A | 2022-04-12 | |||
| CN112489914A | 2021-03-12 | |||
| CN113035483A | 2021-06-25 | |||
| CN113035481A | 2021-06-25 | |||
| CN106887323A | 2017-06-23 | |||
| CN107256795A | 2017-10-17 | |||
| JP2000252108A | 2000-09-14 |
Attorney, Agent or Firm:
CN-KNOWHOW INTELLECTUAL PROPERTY AGENT LIMITED (CN)
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