NDFEB MAGNETIC POWDER, NDFEB SINTERED MAGNET AND PREPARATION METHOD THEREFOR

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The present disclosure relates to the technical field of magnetic material, and in particular to an NdFeB magnetic powder, an NdFeB sintered magnet and a preparation method therefor. The NdFeB magnetic powder and the preparation method therefor improve the composition of the NdFeB magnetic powder, and does not carry out a dehydrogenation treatment after a hydrogen decrepitation process. The resulting NdFeB magnetic powder has a rare earth-rich grain boundary phase and low oxygen content, helping to reduce the loss of rare earth elements in the sintered magnet and inhibit grain growth during the sintering process. The structure of the sintered magnet is improved, and the magnetic performance and mechanical performance of the sintered magnet is enhanced. The resulting NdFeB magnetic powder has low average particle size, helping to further improve the mechanical performance of the sintered magnet.