Rare earth permanent magnets and their preparation

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United States of America Patent

PATENT NO 11482377
APP PUB NO 20200194170A1
SERIAL NO

16801674

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Abstract

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A sintered magnet body (RaT1bMcBd) coated with a powder mixture of an intermetallic compound (R1iM1j, R1xT2yM1z, R1iM1jHk), alloy (M1dM2e) or metal (M1) powder and a rare earth (R2) oxide is diffusion treated. The R2 oxide is partially reduced during the diffusion treatment, so a significant amount of R2 can be introduced near interfaces of primary phase grains within the magnet through the passages in the form of grain boundaries. The coercive force is increased while minimizing a decline of remanence.

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Patent Owner(s)

Patent OwnerAddress
SHIN-ETSU CHEMICAL CO LTD4-1 MARUNOUCHI 1-CHOME CHIYODA-KU TOKYO 100-0005

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Minowa, Takehisa Echizen, JP 140 1510
Nagata, Hiroaki Echizen, JP 32 276
Nomura, Tadao Echizen, JP 30 239

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