An Enhanced Coercivity for (CeNdPr)–Fe–B Sintered Magnet Prepared by Structure Design

To obtain the excellent magnetic properties for the Ce substitution magnets, we proposed a dual-main-phase method to prepare the high-permanence (CePrNd)-Fe-B magnet with low cost. The main phase in this method means the hard magnetic phase with high anisotropy field. Compared with the traditional sintered method adjusting the composition of the magnet, the dual-main-phase method can also design the distribution of the main phase in the magnet, which makes the structure satisfy the demand of the magnet with outstanding properties. Compared with the magnet prepared by the single-alloy method, the coercivity of the magnet prepared by the dual-main-phase method is dramatically enhanced from 7.7 to 12.1 kOe, which may be due to the distribution of the grain boundary phase between the different kinds of main phases.