High-performance Pr2Fe14C-type magnets prepared by melt spinning

Abstract Without annealing, Pr 13 Fe 80− x Co x C 5 B 2 ( x =0–20) ribbons with a coercive force of more than 1.0 T have been prepared by melt spinning. Due to Co addition, rectangularity of demagnetization curves is significantly improved. The remanence and maximum energy product of the samples are obviously increased with the increase of x ( x ⩽15). A maximum energy product of 145.7 kJ/m 3 , which is the highest value among all that previously reported in the R 2 Fe 14 C-type (R=Nd or Pr) ribbons, has been achieved in the ribbons ( x =15) prepared directly by melt spinning. The Curie temperatures of 2:14:1 carbides of the ribbons in the as-quenched state increase linearly with x at an average rate 12 K/at%Co. Similar to B and Cu, Co addition is found to accelerate the formation of 2:14:1 carbides.