Rare earth magnet and manufacturing method therefor

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United States of America Patent

PATENT NO 11664140
APP PUB NO 20210327620A1
SERIAL NO

17182993

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Abstract

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A rare earth magnet includes a main phase and a particle boundary phase and in which an overall composition is represented by a formula, (R2(1-x)R1x)yFe(100-y-w-z-v)CowBzM1v.(R3(1-p)M2p)q.(R4(1-s)M3s)t, where R1 is a light rare earth element, R2 and R3 are a medium rare earth element, R4 is a heavy rare earth element, M1, M2, M3 are a predetermined metal element. The main phase includes a core portion, a first shell portion, and a second shell portion. The content proportion of medium rare earth element is higher in the first shell portion than in the core portion, the content proportion of medium rare earth element is lower in the second shell portion than in the first shell portion. The second shell portion contains heavy rare earth elements.

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Patent Owner(s)

Patent OwnerAddress
TOYOTA JIDOSHA KABUSHIKI KAISHATOYOTA-SHI AICHI-KEN 471-8571

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kinoshita, Akihito Mishima, JP 19 21
Sakuma, Noritsugu Mishima, JP 55 138
Shoji, Tetsuya Susono, JP 70 220

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