Alloy for R-T-B-based rare earth sintered magnet, process of producing alloy for R-T-B-based rare earth sintered magnet, alloy material for R-T-B-based rare earth sintered magnet, R-T-B-based rare earth sintered magnet, process of producing R-T-B-based rare earth sintered magnet, and motor

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United States of America Patent

PATENT NO 11024448
APP PUB NO 20170025207A1
SERIAL NO

15219110

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An alloy for R-T-B-based rare earth sintered magnets which contains R which is a rare earth element; T which is a transition metal essentially containing Fe; a metallic element M containing one or more metals selected from Al, Ga and Cu; B and inevitable impurities, in which R accounts for 13 at % to 15 at %, B accounts for 4.5 at % to 6.2 at %, M accounts for 0.1 at % to 2.4 at %, T accounts for balance, a proportion of Dy in all rare earth elements is in a range of 0 at % to 65 at %, and the following Formula 1 is satisfied,

description='In-line Formulae' end='lead'0.0049Dy+0.34≤B/TRE≤0.0049Dy+0.36  Formula 1description='In-line Formulae' end='tail'

wherein Dy represents a concentration (at %) of a Dy element, B represents a concentration (at %) of a boron element, and TRE represents a concentration (at %) of all the rare earth elements.

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Patent Owner(s)

Patent OwnerAddress
TDK CORPORATIONTOKYO 103-6128

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nakajima, Kenichiro Chichibu, JP 54 858
Yamazaki, Takashi Chichibu, JP 286 2269

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