Process for producing R-T-B-based rare earth magnet particles, R-T-B-based rare earth magnet particles, and bonded magnet

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United States of America Patent

PATENT NO 11688534
APP PUB NO 20160225500A1
SERIAL NO

15010539

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Abstract

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A process for producing R-T-B-based rare earth magnet powder having excellent coercive force and high remanent flux density. A process for producing R-T-B-based rare earth magnet powder by HDDR treatment, in which a raw material alloy for the R-T-B-based rare earth magnet powder includes R (wherein R represents at least one rare earth element including Y), T (wherein T represents Fe, or Fe and Co) and B (wherein B represents boron), and has a composition including R in an amount of between 12.0 atom % and 17.0 atom %, and B in an amount of between 4.5 atom % and 7.5 atom %; the HDDR treatment includes a DR step including a preliminary evacuation step and a complete evacuation step; and a rate of pressure reduction caused by evacuation in the preliminary evacuation step is not less than 1 kPa/min and not more than 30 kPa/min.

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Patent Owner(s)

Patent OwnerAddress
TODA KOGYO CORPHIROSHIMA-SHI HIROSHIMA 732-0828

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kaneko, Shohei Otake, JP 10 24
Katayama, Nobuhiro Otake, JP 8 9
Morimoto, Koichiro Otake, JP 17 72
Shigeoka, Kuniyoshi Otake, JP 2 7

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