| 摘要 |
PURPOSE:To reduce the irreversible demagnetization (the phenomenon of which the residual magnetic flux density reduced at a high temp. does not recover in the case the temp. is returned to an ordinary one) of an R (rare earth elements)-Fe-B-C permanent magnet and to improve the heat stability of its magnetic properties. CONSTITUTION:In an R-Fe-M-B-C alloy magnet (where R denotes at least one kind selected from Nd, Pr, Ce, La, Y, Sm, Tb, Dy, Gd, Ho, Er, Tm and Yb and M denotes at least one kind selected from Ti, V, Cr, Mn, Ni, Zr, Nb, Mo, Hf, Ta, W, Pd, Ag, Pt, Au, Al, Cu, Ga, In, Sn, Sb, Pb, Bi, Zn, P, Si, Ge and S), each of the magnetic crystalline grains of the allay is coated with a grain boundary phase contg. <=16.0wt.% (not including zero wt.%) C. |
