Title:
NEODYMIUM-IRON-BORON PERMANENT MAGNET MATERIAL, RAW MATERIAL COMPOSITION THEREFOR AND PREPARATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/238784
Kind Code:
A1
Abstract:
Disclosed are a neodymium-iron-boron permanent magnet material, a raw material composition therefor and a preparation method therefor. The raw material composition for preparing the neodymium-iron-boron permanent magnet material comprises the following components: R: 30.2-31.7 mass%, R being a rare earth element; Nb: <0.25 mas% and not 0; Cu: 0.35-0.5 mass%; Al: 0-0.2 mass%; B: 0.92-0.96 mass%; and Fe: 60- 70 mass%. The sum of the components is 100 mass%, R comprises heavy rare earth metal RH, and RH comprises Dy and/or Tb. The square degree of the neodymium-iron-boron permanent magnet material prepared from the raw material composition is 99% or above; the absolute value of the temperature coefficient of Hcj at 20-150°C is 0.404% to 0.414%; the heat treatment temperature range is 470-510°C; Br ≥ 14 kGs, and the coercive force ≥ 25 kOe.
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Inventors:
LAN QIN (CN)
HUANG JIAYING (CN)
MOU WEIGUO (CN)
HUANG JIAYING (CN)
MOU WEIGUO (CN)
Application Number:
PCT/CN2021/095070
Publication Date:
December 02, 2021
Filing Date:
May 21, 2021
Export Citation:
Assignee:
XIAMEN TUNGSTEN CO LTD (CN)
FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD (CN)
FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD (CN)
International Classes:
H01F1/057; B22F1/00; C22C38/00; C22C38/06; H01F41/02
Foreign References:
| CN111599563A | 2020-08-28 | |||
| CN111081443A | 2020-04-28 | |||
| CN111180159A | 2020-05-19 | |||
| CN111009369A | 2020-04-14 | |||
| CN107610858A | 2018-01-19 |
Attorney, Agent or Firm:
SHANGHAI JOINT-WIN LAW FIRM (CN)
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