R-Fe—B sintered magnet and making method

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United States of America Patent

PATENT NO 9892831
SERIAL NO

15087179

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Abstract

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The invention provides an R—Fe—B sintered magnet consisting essentially of 12-17 at % of R, 0.1-3 at % of M1, 0.05-0.5 at % of M2, 4.8+2*m to 5.9+2*m at % of B, and the balance of Fe, containing R2(Fe,(Co))14B intermetallic compound as a main phase, and having a core/shell structure that the main phase is covered with a HR-rich layer and a (R,HR)—Fe(Co)-M1 phase wherein HR is Tb, Dy or Ho. The sintered magnet exhibits a coercivity ≧10 kOe despite a low content of Dy, Tb, and Ho.

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Patent Owner(s)

Patent OwnerAddress
SHIN-ETSU CHEMICAL CO LTDTOKYO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hirota, Koichi Echizen, JP 103 1054
Kume, Tetsuya Echizen, JP 29 89
Nagata, Hiroaki Echizen, JP 32 276
Nakamura, Hajime Echizen, JP 164 2612

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