Improved processing techniques for high performance NdFeB magnets

A high performance sintered NdFeB magnet with N52 was prepared by strip casting, hydrogen decrepitation, jet milling, rubber isostatic pressing with impulse magnetic field and vibrating. The structure of the magnet was investigated by XRD, optical microscope, TEM and SEM, and its demagnetization curve was tested by magnetograph. The results show that the room-temperature magnetic properties of the Nd_29.0Pr_0.5Ga_0.2Fe_69.1Nb_0.2B_1.0 magnet can reach up to B_r=1.457T,H_ci=1097kÅm^-1,(BH)_max=409kJ·m^-3, with a better homogeneity and consistency.