High-performance nanocrystalline NdFeB magnets by CAPA process

Abstract The anisotropic NdFeB magnets were prepared from the melt-spun isotropic powders by CAPA process. The precursor isotropic magnet shows the uniform magnetic properties according to the overall position in the magnet. In the case of the anisotropic magnet, the outer position shows higher remanence and energy product compared to the center position. The magnetic properties of the anisotropic magnet obtained from Nd 14 Fe 80 B 6 powders are B r = 15 kG , i H c = 4.1 kOe and B H max = 36 MG Oe . In the case of addition of Zn to Nd 14 Fe 80 B 6 powders, the energy product increased because of the improved coercivity. The magnetic properties of the Zn-added magnet are B r = 14.5 kG , i H c = 9.7 kOe and B H max = 52 MG Oe . The Zn addition is effective to depress Nd 2 Fe 14 B grain growth of the interparticle regions during plastic deformation.