Title:
METHOD AND APPARATUS FOR PREPARING HIGH-ABUNDANCE RARE EARTH CERIUM-BASED ANISOTROPIC NANOCRYSTALLINE MAGNET
Document Type and Number:
WIPO Patent Application WO/2024/040859
Kind Code:
A1
Abstract:
A method and apparatus for preparing a high-abundance rare earth cerium-based anisotropic nanocrystalline magnet. A constrained deformation mold is used to preliminarily press high-abundance rare earth cerium-based nanocrystalline magnetic powder into a cold blank by means of mechanical pressure, and a precursor magnet is obtained after demolding. The precursor magnet is placed into a vacuum hot-pressing furnace, pressure is applied onto the surfaces in the vertical direction, and low-speed upsetting deformation is performed at a low temperature to obtain an anisotropic magnet. The method is characterized in that an anisotropic magnet can be obtained by using a constrained deformation mold and a one-step thermal deformation method, thereby effectively avoiding the problem of grain growth caused by two traditional high-temperature processes of hot-pressing and thermal deformation. A constraint loop (4) in the constrained deformation mold has the effect of preventing a magnet from cracking in the deformation process, and therefore, the grain size can be further optimized by employing a low-temperature (600-700°C) and low-speed deformation method. Therefore, the problems in the prior art that main-phase grains cannot obtain anisotropy and the coercivity of magnets seriously deteriorates are effectively solved. The preparation method is simple, the requirement for preparation conditions is low, the apparatus cost is low, the preparation cost is greatly reduced, and the properties of high-abundance rare earth cerium-based anisotropic nanocrystalline magnet finished products are significantly improved.
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Inventors:
ZHOU QING (CN)
LIAO XUEFENG (CN)
ZHU YONGYANG (CN)
TANG YONGLI (CN)
LU QIYUN (CN)
ZENG WEIWEI (CN)
LU CIFU (CN)
TANG RENHENG (CN)
LIAO XUEFENG (CN)
ZHU YONGYANG (CN)
TANG YONGLI (CN)
LU QIYUN (CN)
ZENG WEIWEI (CN)
LU CIFU (CN)
TANG RENHENG (CN)
Application Number:
PCT/CN2023/071245
Publication Date:
February 29, 2024
Filing Date:
January 09, 2023
Export Citation:
Assignee:
INST OF RESOURCES UTILIZATION AND RARE EARTH DEVELOPMENT GUANGDONG ACADEMY OF SCIENCES (CN)
HUIZHOU FELLER MAGNETS CO LTD (CN)
HUIZHOU FELLER MAGNETS CO LTD (CN)
International Classes:
B22F3/02; B22F3/03; B22F3/14; C22C38/00; H01F1/053; H01F1/057; H01F41/02
Foreign References:
| CN115430836A | 2022-12-06 | |||
| CN106448986A | 2017-02-22 | |||
| CN101530916A | 2009-09-16 | |||
| CN103084577A | 2013-05-08 | |||
| CN104576028A | 2015-04-29 | |||
| US4921551A | 1990-05-01 |
Attorney, Agent or Firm:
HCIS INTELECTUAL PROPERTY AGENT LTD. (CN)
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