| 简介 |
The invention provides an R-T-B-based rare earth permanent magnet in which a high coercivity (Hcj) can be obtained without increasing the concentration of Dy in an R-T-B-based alloy, furthermore, degradation of remanence (Br) can be suppressed by adding Dy, and excellent magnetic characteristics can be obtained. The invention relates to an R-T-B-based rare earth permanent magnet consisting of a sintered compact having a main phase mainly including R 2 Fe 14 B and grain boundary phases including more R than the main phase, in which R refers to rare earth elements including Nd as an essential element, the sintered compact includes Ga as an essential elements, the grain boundary phases include a first grain boundary phase, a second grain boundary phase, and a third grain boundary phase which have different total atomic concentrations of the rare earth elements, the third grain boundary phase has a lower total atomic concentration of the rare earth elements than the first grain boundary phase and the second grain boundary phase, and has a higher atomic concentration of Fe than the first grain boundary phase and the second grain boundary phase. |
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