Abstract
To develop high-performance MM-based sintered magnets (MM=Misch Metal), the effects of varying the rare earth (RE) and boron (B) content on the microstructure and magnetic properties of (MM, Nd)-Fe-B sintered magnets were performed. By increasing the RE content from 30 wt.% to 33 wt.% and decreasing the B content from 1 wt.% to 0.9 wt.%, the coercivity (Hcj) increases by 31.8 %. This is mainly attributed to an increase in the volume of the grain boundary (GB) and the formation of additional REFe2 phase. Micromagnetic simulations confirmed that the REFe2 phase, acting as a paramagnetic GB, has a positive effect on enhancing coercivity. During the demagnetization process, the propagation of reversed domains is hindered when the paramagnetic GB becomes thicker. This study provides a new recipe to develop MM-based sintered magnets with high comprehensive properties through varying RE and B contents.
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