Abstract
TbHx nanoparticles were applied to prepare sintered MM-Fe-B magnet by using grain boundary diffusion technique. Under optimal processing conditions, the coercivity and maximum energy product substantially increase by 383% and 151%, reaching to 6.81 kOe and 20.18 MGOe, respectively. Further investigation indicates that the interchange between Tb atoms and Ce atoms leads to a core/shell structure with (MM,Tb)2Fe14B phase in the surface region of MM2Fe14B matrix grains in the magnet. The modified structure successfully restrains the magnetic domain reversal process, resulting in remarkable enhancement of coercivity and maximum energy product of the magnet.
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