Sintered Nd—Fe—B magnet composition and a production method for the sintered Nd—Fe—B magnet

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United States of America

PATENT NO 10978226
APP PUB NO 20170372823A1
SERIAL NO

15588584

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Abstract

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A sintered Nd—Fe—B magnet comprising at least one light rare earth element having a weight content between 31 wt. % and 35 wt. %, at least one heavy rare earth element having a weight content of no more than 0.2 wt. %, B having a weight content between 0.95 wt. % and 1.2 wt. %, at least one additive including Ti and having a weight content between 1.31 wt. % and 7.2 wt. %, Fe as a balance, and impurities including C, O, and N. Ti has a weight content between 0.3 wt. % and 1 wt. % and forms a Titanium-Iron-Boron phase with Fe and Boron B and being present in the sintered Nd—Fe—B magnet between 0.86 vol. % and 2.85 vol. %. The C, O, and N satisfy 630 ppm≤1.2C+0.6O+N≤3680 ppm. The sintered Nd—Fe—B magnet has a squareness factor of at least 0.95.

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Patent Owner(s)

Patent OwnerAddress
YANTAI DONGXING MAGNETIC MATERIALS INCYANTAI CITY 265500

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Xiulei Yantai, CN 11 1
Ding, Kaihong Yantai, CN 31 7
Peng, Zhongjie Yantai, CN 44 17
Wang, Guohai Yantai, CN 6 6

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