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Title:
DOUBLE-SHELL NEODYMIUM-IRON-BORON MAGNET AND PREPARATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/188548
Kind Code:
A1
Abstract:
Disclosed are a double-shell neodymium-iron-boron magnet and a preparation method therefor. The double-shell neodymium-iron-boron magnet comprises main phase crystalline particles, a double shell thereof and an Nd-rich phase, which is adjacent to the main phase crystalline particles, wherein the main phase crystalline particles comprise R2Fe14B; an inner layer of the double shell comprises (Nd/Ho)2Fe14B and/or (Nd/Gd)2Fe14B, and an outer layer of the double shell comprises (Nd/Dy)2Fe14B and/or (Nd/Tb)2Fe14B, wherein the double shell has a thickness of 0.1 to 6 μm; and the Nd-rich phase comprises an (R-RH)6T13X phase. By means of the present invention, the double-shell neodymium-iron-boron magnet can be obtained, and a relatively thin shell is formed around a main phase, such that the amount of heavy rare earth elements being diffused into the main phase is effectively reduced.

Inventors:
WEI XING (CN)
HUANG JIAYING (CN)
TANG ZHIHUI (CN)
HUANG QINGFANG (CN)
JIANG ZHIPENG (CN)
XU DEQIN (CN)
CHEN DAKUN (CN)
FU GANG (CN)
Application Number:
PCT/CN2022/072242
Publication Date:
September 15, 2022
Filing Date:
January 17, 2022
Export Citation:
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Assignee:
FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD (CN)
International Classes:
H01F1/057; H01F41/02
Foreign References:
CN109509605A2019-03-22
CN111243809A2020-06-05
CN106653268A2017-05-10
CN111210963A2020-05-29
CN107275025A2017-10-20
JP2014150119A2014-08-21
CN111636035A2020-09-08
Other References:
See also references of EP 4250317A4
Attorney, Agent or Firm:
SHANGHAI JOINT-WIN LAW FIRM (CN)
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