Patent ID: 11798717

Abstract:
An R-T-B-based rare earth permanent magnet in which the composition formula is represented by (R11-x-ySmxR2y)aTbBcMd, wherein: R1 is one or more rare earth elements not including Sm and Y; R2 is one or more rare earth elements from among Y, Ce, and La; T is Fe, etc.; M is Ga, etc.; x and y are in the region indicated in FIG. 1; the relationships 0.16≤a/b≤0.28, 0.050≤c/b≤0.075, and 0.005≤d/b≤0.028 are satisfied; the R-T-B-based rare earth permanent magnet includes a grain boundary phase and a main phase comprising an R2T14B compound; the average crystal grain diameter of the main-phase crystal grains is D50≤4.00 μm; the granularity distribution is (D90−D10)/D50≤1.60; and the coverage of the grain boundary phase is at least 70.0%.