NEODYMIUM-IRON-BORON BONDED MAGNET, PREPARATION METHOD THEREFOR, AND MOTOR

WIPO Patent Application WO/2023/123749

A1

The present invention provides a neodymium-iron-boron bonded magnet, a preparation method therefor, and a motor. The preparation method comprises: step S1, mixing a phenolic resin, a curing agent, and neodymium-iron-boron magnetic powder under a heating condition to obtain mixed rubber powder; step S2, mixing the mixed rubber powder with a lubricant, and pressing the mixture to obtain a magnet pressed compact, wherein the content of the phenolic resin in the magnet pressed compact is 2.5-6.0 wt%, the content of the curing agent is 0.25-0.6 wt%, the content of the neodymium-iron-boron magnetic powder is 93.3-97.15 wt%, and the content of the lubricant is 0.1-0.2 wt%; and step S3, performing staged heat curing on the magnet pressed compact to obtain the neodymium-iron-boron bonded magnet, wherein the staged heat curing comprises 2 to 4 stages of step-by-step heat curing, the temperature of the staged heat curing is 105-195°C, and the time is 30-60 min. The strength of the obtained neodymium-iron-boron bonded magnet is greater than 120 MPa, and the neodymium-iron-boron bonded magnet can pass a continuous operation test of a motor at 80,000 rpm.

JP2780422	PROBLEM TO BE SOLVED: To manufacture a resin magnet structure.
JPH05299223	FE-B-R BONDED MAGNET
JPS62128503	SINTERED TYPE RARE EARTH MAGNET

HE FENG (CN)
TONG CHENGLI (CN)
LUO YULIANG (CN)
SUN BAOLI (CN)

PCT/CN2022/087462

July 06, 2023

April 18, 2022

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MAGNEQUENCH TIANJIN CO LTD (CN)

H01F1/057; B22F1/10; B22F3/02; B22F3/10; H01F41/02

CN102568730A	2012-07-11
JP2002373805A	2002-12-26
CN112927880A	2021-06-08

KANGXIN PARTNERS, P.C. (CN)

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