R-T-B-C TYPE RARE EARTH SINTERED MAGNET AND MAKING METHOD

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An R-T-B-C rare earth sintered magnet (R = Ce, Pr, Nd, Tb, or Dy; T = Fe) is obtained by mixing an R-T-B-C magnet matrix alloy with an R fluoride and an R-rich R-T-B-C sintering aid alloy, followed by pulverization, compaction and sintering. The sintered structure consists of an R 2 T 14 B type crystal primary phase and a grain boundary phase. The grain boundary phase consists essentially of 40-98 vol% of R-O 1-x -F 1+2x and/or R-F y , 1-50 vol% of R-O, R-O-C or R-C compound phase, 0.05-10 vol% of R-T phase, 0.05-20 vol% of B-rich phase or M-B 2 phase (M = Ti, V, Cr, Zr, Nb, Mo, Hf, Ta or W), and the balance of an R-rich phase.