R-T-B based rare earth sintered magnet and method of producing R-T-B based rare earth sintered magnet
AssigneeTDK Corporation
InventorsHiroki Kawamura, Makoto Iwasaki
Life of this patent
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Abstract
An R—T—B based rare earth sintered magnet in which R is a rare earth sintered magnet, T is an iron group element, and B is boron. R includes one or more selected from Nd and Pr. The R—T—B based rare earth sintered magnet includes M and C in which M is one ore more selected from Zr, Ti, and Nb. The R—T—B based rare earth sintered magnet includes main phase grains and grain boundaries, and the grain boundaries includes a coexisting part in which a M—C compound, a M—B compound, and a 6-13-1 phase coexist. The R—T—B based rare earth sintered magnet attains improved HcJ while maintaining good Br and Hk/HcJ.
Claims5
An R—T—B based rare earth sintered magnet comprising M and C in which R is a rare earth element, T is an iron group element, and B is boron, wherein
- R includes one or more selected from Nd and Pr;
- M is one or more selected from Zr, Ti, and Nb;
- and
- the R—T—B based rare earth sintered magnet includes main phase grains and grain boundaries, and the grain boundaries include a coexisting part in which an M—C compound, an M—B compound, and a 6-13-1 phase coexist.
Dependencies are inferred from the claim text.