Title:
SINTERED NEODYMIUM-IRON-BORON MAGNET WITH HIGH CORROSION RESISTANCE AND HIGH MAGNETIC PERFORMANCE, AND PREPARATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/051588
Kind Code:
A1
Abstract:
Provided in the present invention are a sintered neodymium-iron-boron magnet with high corrosion resistance and high magnetic performance, and a preparation method therefor. The sintered neodymium-iron-boron magnet comprises Co at a content of 1.5-3.0 wt%, and comprises a main phase and a grain boundary phase, wherein Co is distributed in the grain boundary phase of crystalline grains and the main phase of crystalline grains. The sintered neodymium-iron-boron magnet satisfies: w1 ≥ w2, wherein w1 is the content of Co distributed in the grain boundary phase of the crystalline grains, and w2 is the content of Co distributed in the main phase of the crystalline grains. By concentrating Co in the grain boundary phase, Co and an Nd-rich phase can form an Nd3Co phase; and the formation of the Nd3Co phase improves the electrode potential of the whole grain boundary phase, reduces the degree of electrochemical corrosion, greatly lowers the weight loss of the magnet, significantly improves the corrosion resistance of the neodymium-iron-boron magnet, and can also significantly enhance the magnetic performance of the neodymium-iron-boron magnet, making the neodymium-iron-boron magnet have both corrosion resistance and magnetic performance.
Inventors:
XU ZHAOPU (CN)
ZHANG YUMENG (CN)
WANG JILIANG (CN)
ZHAO JILING (CN)
ZHAO NAN (CN)
ZHANG YUMENG (CN)
WANG JILIANG (CN)
ZHAO JILING (CN)
ZHAO NAN (CN)
Application Number:
PCT/CN2023/116478
Publication Date:
March 14, 2024
Filing Date:
September 01, 2023
Export Citation:
Assignee:
NANTONG ZHENGHAI MAGNET CO LTD (CN)
YANTAI ZHENGHAI MAGNETIC MAT CO LTD (CN)
YANTAI ZHENGHAI MAGNETIC MAT CO LTD (CN)
International Classes:
H01F41/02; B22F3/00; H01F1/055
Foreign References:
| CN115360008A | 2022-11-18 | |||
| CN102376407A | 2012-03-14 | |||
| CN111640549A | 2020-09-08 | |||
| JP2006210450A | 2006-08-10 | |||
| US20180025820A1 | 2018-01-25 |
Attorney, Agent or Firm:
BEIJING ORIGINTELLIGENCE IP LAW FIRM (CN)
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