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 103-6128

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujiwara, Atsushi Tokyo, JP 61 1344
Ishizaka, Chikara Tokyo, JP 44 270
Kato, Eiji Tokyo, JP 111 1921
Mitake, Koji Tokyo, JP 12 45
Miwa, Masashi Tokyo, JP 47 171
Tsubokura, Taeko Tokyo, JP 23 108

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