Abstract
In order to prepare high-performance low-cost sintered (Nd, MM)-Fe-B magnets, the effect of the microstructure of strip-casting alloys on the particle size and distribution of powder was first investigated in this work. By adding lubricant and antioxidant to improve orientation and control oxygen content, the mischmetal-based sintered magnet possessing fine grains (~2.5 μm) along with smooth and continuous grain boundaries could maintain the excellent magnetic properties of Br = 12.31 kG, Hcj = 9.61 kOe and (BH)max = 36.52 MGOe by optimizing two-stage annealing temperature. The magnet prepared in this work exhibits record-high magnetic properties in the same proportion of MM substitution, which provides useful guidance for the preparation of MM doped magnets.
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