R-T-B based sintered magnet

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United States of America Patent

PATENT NO 10748683
APP PUB NO 20170103835A1
SERIAL NO

15285178

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Abstract

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An R-T-B based sintered magnet includes “R”, “T”, and “B”. “R” represents a rare earth element including at least Tb. “T” represents a metal element except rare earth elements including at least Fe, Cu, Mn, Al, and Co. “B” represents boron or boron and carbon. With respect to 100 mass % of a total mass of the R-T-B based sintered magnet, a content of “R” is 28.0 to 32.0 mass %, a content of Cu is 0.04 to 0.50 mass %, a content of Mn is 0.02 to 0.10 mass %, a content of Al is 0.15 to 0.30 mass %, a content of Co is 0.50 to 3.0 mass %, and a content of “B” is 0.85 to 1.0 mass %. Tb2/Tb1 is 0.40 to less than 1.0, where Tb1 and Tb2 (mass %) denote a content of Tb at a surface portion and at a core portion, respectively.

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Patent Owner(s)

Patent OwnerAddress
TDK CORPORATION2-5-1 NIHONBASHI CHUO-KU TOKYO 103-6128

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Baba, Fumitaka Tokyo, JP 13 142
Hayakawa, Takuma Tokyo, JP 15 43
Hidaka, Tetsuya Tokyo, JP 30 145
Iwasaki, Makoto Tokyo, JP 102 537
Kakoki, Ayato Tokyo, JP 7 8
Tsukamoto, Naoto Tokyo, JP 9 24

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