PERMANENT MAGNETS

摘要

A magnetically anisotropic sintered permanent magnet of the FeCoBR system (R is sum of R1 and R2) wherein: R1 is Dy, Tb, Gd, Ho, Er, Tm and/or Yb, and R2 comprises 80 at % or more of Nd and Pr in R2, and the balance of other rare earth elements exclusive of R1, said system consisting essentially of, by atomic percent, 0.05 to 5% of R1, 12.5 to 20% of R, 4 to 20% of B up to 35% of Co, and the balance being Fe. Additional elements M(Ti, Zr, Hf, Cr, Mn, Ni, Ta, Ge, Sn, Sb, Bi, Mo, Nb, Al, V, W) may be present.