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US 10,096,410 B2Granted
R-T-B based sintered magnet
AssigneeTDK Corporation
InventorsMasashi Miwa, Haruna Nakajima, Koji Mitake, Chikara Ishizaka
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Abstract
An R-T-B based sintered magnet having R2T14B crystal grains and a grain boundary formed by two or more adjacent R2T14B crystal grains. An R—Co—Cu—N concentrated part whose concentrations of R, Co, Cu and N are respectively higher than those in the R2T14B crystal grains may be in the grain boundary. An R—O—C concentrated part or an R—O—C—N concentrated part may be further provided in the grain boundary.
Claims19
An R-T-B based sintered magnet comprising:
- a plurality of R2T14B crystal grains;
- at least one grain boundary formed by two or more adjacent R2T14B crystal grains;
- and
- an R—Co—Cu—N concentrated part in the at least one grain boundary,
- wherein concentrations of R, Co, Cu and N in the R—Co—Cu—N concentrated part are respectively higher than concentrations of R, Co, Cu and N in the plurality of R2T14B crystal grains, and
- a ratio of atom number composition of N to a total atom number composition in the R—Co—Cu—N concentrated part is in the range of 10% to 15%.
3 more elements
Dependencies are inferred from the claim text.