METHOD FOR PREPARING HIGH-ORIENTATION-DEGREE SINTERED NEODYMIUM-IRON-BORON PERMANENT MAGNETIC MATERIAL

Title:

METHOD FOR PREPARING HIGH-ORIENTATION-DEGREE SINTERED NEODYMIUM-IRON-BORON PERMANENT MAGNETIC MATERIAL

Document Type and Number:

WIPO Patent Application WO/2017/181669

Kind Code:

A1

Abstract:

Provided is a method for preparing a high-orientation-degree sintered neodymium-iron-boron permanent magnetic material. Neodymium-iron-boron powder particles and an organic solvent are mixed to prepare a slurry, and the slurry is poured into a mould; then a non-pressure orientation is performed in a magnetic field to obtain a high orientation degree; next, a blank with a certain compactness is obtained through cold isostatic pressing; and finally, a magnet is obtained by performing sintering densification and tempering thermal treatment. The slurry formed from the neodymium-iron-boron powder and the organic solvent is high in fluidity, and is not subjected to a pressing pressure in the magnetic field orientation process, such that it can be ensured that the orientation is sufficient and is not destroyed; then the blank can be rendered to reach a certain compactness and have a uniformly distributed density through cold isostatic pressing, such that not only can sintering densification be realized, but also cracks and falling off of edges and corners caused by uneven density and the like in the sintering process can be avoided, so that sintered neodymium-iron-boron permanent magnetic material having a high-orientation-degree is obtained finally.

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Inventors:

GAO XUEXU (CN)
CAO SHUAI (CN)
BAO XIAOQIAN (CN)
TANG MINGHUI (CN)
LU KECHAO (CN)

Application Number:

PCT/CN2016/106583

Publication Date:

October 26, 2017

Filing Date:

November 21, 2016

Export Citation:

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Assignee:

UNIV OF SCIENCE TECH BEIJING (CN)

International Classes:

H01F41/02; H01F1/057

Foreign References:

CN105931833A	2016-09-07
CN1130289A	1996-09-04
CN102403118A	2012-04-04
CN101740190A	2010-06-16
JPH0920953A	1997-01-21
US6010983A	2000-01-04

Attorney, Agent or Firm:

BEIJING GUANGYOU PATENT FIRM CO.,LTD (CN)

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