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)

Patent OwnerAddress
TDK CORPORATIONTOKYO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujiwara, Atsushi Tokyo, JP 56 1088
Ishizaka, Chikara Tokyo, JP 44 164
Kato, Eiji Tokyo, JP 111 1263
Mitake, Koji Tokyo, JP 4 13
Miwa, Masashi Tokyo, JP 35 90
Tsubokura, Taeko Tokyo, JP 16 54

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