R-T-B sintered magnet

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United States of America Patent

PATENT NO 9837193
APP PUB NO 20130293328A1
SERIAL NO

13980133

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Abstract

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This sintered R-T-B based rare-earth magnet includes: R2Fe14B type compound crystal grains, including a light rare-earth element RL (which includes at least one of Nd and Pr) as a major rare-earth element R, as main phases; and a heavy rare-earth element RH (which includes at least one of Dy and Tb). Before its surface region is removed, the sintered R-T-B based rare-earth magnet has no layer including the rare-earth element R at a high concentration in that surface region. The sintered R-T-B based rare-earth magnet has a portion in which coercivity decreases gradually from its surface region toward its core portion. The difference in the amount of TRE between a portion of the sintered R-T-B based rare-earth magnet that reaches a depth of 500 μm as measured from its surface region toward its core portion and the core portion of the sintered R-T-B based rare-earth magnet is 0.1 through 1.0.

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Patent Owner(s)

Patent OwnerAddress
PROTERIAL LTD6-36 TOYOSU 5-CHOME KOTO-KU TOKYO 1350061

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kuniyoshi, Futoshi Osaka, JP 51 237

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