Title:
HIGH-COERCIVITY ND-FE-B SERIES SINTERED MAGNET AND PREPARATION METHOD AND APPLICATION THEREOF
Document Type and Number:
WIPO Patent Application WO/2024/007808
Kind Code:
A1
Abstract:
Disclosed in the present invention are a high-coercivity Nd-Fe-B sintered magnet and a preparation method and use thereof. The sintered magnet comprises the following components in percentage by mass: 100%: 26-37 wt % of R, R being at least one rare earth element including Nd; 0.07-0.23 wt % of Mn; 0.8-1 wt %, of B; 0.5-4 wt % of M, M comprising Cu and/or Al, and further comprising at least one selected from Co, Ti, Ni, Zr and Ga; and the remaining being Fe. In the present invention, a Mn-containing auxiliary alloy powder is mixed with a Mn-free neodymium-iron-boron main alloy powder to prepare the Nd-Fe-B sintered magnet. In the Mn-containing auxiliary alloy powder, other than the Mn elements in the scope of the invention, it is also necessary to contain at least one of metals Cu and Al. Mn can replace a part of Fe in the main phase, so that the amount of solid solution of beneficial elements in grain boundaries in the main phase is reduced, and the coercivity is improved.
Inventors:
YU YONGJIANG (CN)
GU XIAOQIAN (CN)
WANG CONG (CN)
ZHANG YUMENG (CN)
MA DAN (CN)
GU XIAOQIAN (CN)
WANG CONG (CN)
ZHANG YUMENG (CN)
MA DAN (CN)
Application Number:
PCT/CN2023/098983
Publication Date:
January 11, 2024
Filing Date:
June 07, 2023
Export Citation:
Assignee:
YANTAI ZHENGHAI MAGNETIC MAT CO LTD (CN)
International Classes:
H01F1/057; H01F1/08; H01F7/02; H01F41/02
Foreign References:
| CN115083714A | 2022-09-20 | |||
| CN107039136A | 2017-08-11 | |||
| CN104952580A | 2015-09-30 | |||
| CN111724957A | 2020-09-29 | |||
| CN113241231A | 2021-08-10 | |||
| JPH06224018A | 1994-08-12 |
Attorney, Agent or Firm:
BEIJING ORIGINTELLIGENCE IP LAW FIRM (CN)
Download PDF: