HIGH-CORROSION RESISTANT SINTERED NDFEB MAGNET AND PREPARATION METHOD THEREFOR

摘要

High corrosion resistant sintered NdFeB magnets are provided with a composition by mass % of Nd_xR_x1Fe_{100-(x+x1+y+y1+z)}T_yM_y1B_z, where 24≦x≦33, 0≦x1≦15, 1.43≦y≦16.43, 0.1≦y1≦0.6, 0.91≦z≦1.07, R is one or more selected from the group consisting of Dy, Tb, Pr, Ce and Gd, T is one or more selected from the group consisting of Co, Cu and Al, M is one or more selected from the group consisting of Nb, Zr, Ti, Cr and Mo, and M is distributed within the grain boundary phase of the NdFeB magnets.