R-T-B based permanent magnet

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United States of America Patent

PATENT NO 9947445
SERIAL NO

14385838

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Abstract

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A R-T-B based permanent magnet which has equivalent magnetic properties as the existing Nd—Fe—B based permanent magnet and light mass but also can be suitably used as a magnet for field system of a permanent magnet synchronous rotating machine. The magnet can be obtained in a case where the composition of the compound for forming the main phase is (R1−x(Y1−zCez)x)2T14B (R is rare earth element(s) consisting of one or more elements selected from La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, Y is yttrium, Ce is cerium, T is one or more transition metal elements with Fe or Fe and Co as essential element(s), B is boron, 0.04f/(Y4f+Y4g) in relation to the Y occupying the 4f site of the tetragonal R2T14B structure (i.e., Y4f) and the Y occupying the 4g site (i.e., Y4g) satisfies 0.8≤Y4f/(Y4f+Y4g)≤1.0.

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Patent Owner(s)

Patent OwnerAddress
TDK CORPORATION1-13-1 NIHONBASHI CHUO-KU TOKYO 103-8272

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Choi, Kyung-Ku Tokyo, JP 30 135
Hashimoto, Ryuji Tokyo, JP 70 362
Suzuki, Kenichi Tokyo, JP 402 3766

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