| 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:This is 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, Ha, Er, Tm and Yb and M denotes at least one kind selected from fluorides and nitrides), and each of the magnetic crystalline grains of this allay is coated with a grain boundary phase contg. <=16wt.% (not including zero wt.%) C. |
