Effect of Doping of Ti and C on Crystallization and Magnetic Properties of NdPrFeB Thick Melt-Spun Ribbons

Abstract Effects of Ti and C addition on crystallization process and magnetic properties of NdPrFeB thick ribbons were investigated. The results show that doping of Ti suppresses the formation of (Nd,Pr) 2 Fe 23 B 3 metastable phase and refines grains of the alloys and increases coercivity significantly. In the case of co-addition of Ti and C, the coercivity is decreased but the remanence is enhanced with increasing of C content. The magnetic properties of J r =0.88 T, H cj =618 kA/m and ( BH ) max =109.8 kJ/m 3 are achieved in the (Nd 0.4 Pr 0.6 ) 9 Fe 72 Ti 4 B 11 C 4 ribbons after optimal annealing.