R-Fe-B-BASED RARE EARTH PERMANENT MAGNET MATERIAL

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Disclosed is an R-Fe-B-based rare earth permanent magnet material which is characterized by being composed of, in mass percent, 25-45 wt% of R (R is one ore more of Nd, Pr, Dy Tb and Ho), 0.1-4.5 wt% of Co, 0.8-1.4 wt% of B, 0.05-3.0 wt% of Al, 0.02-0.5 wt% of Cu, 0.03-0.5 wt% of M (M is one or more of Zr, Hf, Ti, Cr, Nb, Mo, Si, Sn, Zn, V, W and Cr), 0.01-0.5 wt% of C, 0.05-3.0 wt% of O, 0.002-0.1 wt% of N, 0.001-2.0 wt% of F and the balance of Fe and unavoidable impurities.