Sintered magnet

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United States of America Patent

PATENT NO 9997284
APP PUB NO 20150170810A1
SERIAL NO

14409186

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A sintered magnet of a preferred embodiment has a composition comprising: R (R is a rare earth element that must contain any one of Nd and Pr.): 29.5 to 33.0 mass %; B: 0.7 to 0.95 mass %; Al: 0.03 to 0.6 mass %; Cu: 0.01 to 1.5 mass %; Co: 3.0 mass % or less (provided that 0 mass % is not included.); Ga: 0.1 to 1.0 mass %; C: 0.05 to 0.3 mass %; O: 0.03 to 0.4 mass %; and Fe and other elements: a balance, and wherein a content of heavy rare earth elements in total is 1.0 mass % or less, and wherein the following relations are satisfied: 0.29<[B]/([Nd]+[Pr])<0.40 and 0.07<([Ga]+[C])/[B]<0.60, where [Nd], [Pr], [B], [C] and [Ga] represent the numbers of atoms of Nd, Pr, B, C and Ga, respectively.

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Patent Owner(s)

  • 501 TDK CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujiwara, Atsushi Tokyo, JP 61 1296
Ishizaka, Chikara Tokyo, JP 44 262
Kato, Eiji Tokyo, JP 111 1803
Mitake, Koji Tokyo, JP 11 39
Miwa, Masashi Tokyo, JP 43 165
Tsubokura, Taeko Tokyo, JP 23 104

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