METHOD FOR IMPROVING COERCIVE FORCE OF SINTERED NEODYMIUM IRON BORON MAGNET BY ADDING DYSPROSIUM HYDROGEN COMPOUND AND PRODUCT

WIPO Patent Application WO/2016/086397

A1

A method for improving a coercive force of a sintered neodymium iron boron magnet by adding a dysprosium hydrogen compound, the method specifically comprises the following steps: 1) preparing a main phase alloy as a uniform fine powder by a hydrogen explosion airflow milling method, and milling a grain boundary phase alloy into a fine powder by a ball milling method; 2) sufficiently and uniformly mixing the prepared main phase alloy powder and grain boundary phase fine powder; 3) orientating the mixed main phase and grain boundary phase powders in a magnetic field, and performing press forming; and 4) sintering the pressed block in a high-vacuum sintering furnace and tempering twice to prepare a final magnet. Also disclosed is a sintered neodymium iron boron magnet prepared by the method. The sintered neodymium iron boron magnet prepared by the method is high in coercive force, simple and convenient to prepare, easy to operate, is not prone to oxidization in the preparation process, and can be applied to large-scale batch production.

WANG XINHUA (CN)
YAN MI (CN)
LIU PAN (CN)
PEI XIAODONG (CN)
ZHOU JUN (CN)
SUN HONGJUN (CN)
YU JIN (CN)

PCT/CN2014/093068

June 09, 2016

December 04, 2014

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UNIV ZHEJIANG (CN)
SINOSTEEL ANHUI TIANYUAN TECHNOLOGY CO LTD (CN)

B22F1/12; B22F3/16; H01F1/057; H01F1/08; H01F41/02

CN102368439A	2012-03-07
CN103060657A	2013-04-24
CN101521069A	2009-09-02
CN101266855A	2008-09-17
JP2013030742A	2013-02-07
CN101996721A	2011-03-30
CN101266857A	2008-09-17

HANGZHOU TIANQIN INTELLECTUAL PROPERTY AGENCY CO., LTD (CN)
杭州天勤知识产权代理有限公司 (CN)

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