Effective Recovery of Nd-Fe-B Sintered Magnet Scrap Powders as Isotropic Bonded Magnets

摘要

Nd-Fe-B sintered magnet scrap powders, viz. "sludge", as produced in the sizing and polishing processes for well-shaped magnets of small-sized motors and other equipments were effectively recovered as the raw powders for isotropic Nd-Fe-B bonded magnets (B_r = 0.66 T, H_cj = 0.92 MA/m, and (BH)_max = 70 kJ/m~3) by means of Ca metal reduction and melt-spun.