Method for increasing the coercivity of a sintered type NdFeB permanent magnet

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United States of America Patent

PATENT NO 12027307
APP PUB NO 20210166870A1
SERIAL NO

16953383

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Abstract

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The present disclosure provides a method for increasing the coercivity of a sintered type NdFeB permanent magnet. The method comprises:

    a) coating of a slurry on a surface of the magnet, the slurry comprisingfirst particles consisting of a heavy rare earth alloy or a heavy rare earth or a non-metallic compound, andsecond particles consisting of a metal alloy or a meta,wherein at least one of the first particles and second particles includes at least one of Dy and Tb and wherein a ratio of the average particle diameter between the second particles and the first particles is 2:1 to 20:1;b) performing a vibration of the coated magnet in vertical direction of the applied slurry with a vibration frequency of 10 Hz to 50 Hz for 30 s to 5 min, then drying the slurry; andc) performing a thermally induced grain boundary diffusion process.

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Patent Owner(s)

Patent OwnerAddress
YANTAI SHOUGANG MAGNETIC MATERIALS INCFUSHAN DISTRICT YANTAI CITY 265500

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ding, Kaihong Shandong, CN 31 7
Jia, Daoning Shandong, CN 7 7
Peng, Zhongjie Shandong, CN 44 17
Wang, Chuanshen Shandong, CN 16 6
Yang, Kunkun Shandong, CN 25 11

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