Construction of high-performance multi-main-phase LaCe-based sintered magnets by chemical heterogeneity enhancement

To further optimize the comprehensive magnetic properties of LaCe-based sintered magnets prepared by constructing a multi-main-phase (MMP) structure, Pr-Fe-B was used as a LaCe-free alloy to prepare MMP sintered magnets with 40 wt% LaCe substitution. Due to the high anisotropy field (H-A) of Pr2Fe14B grains, strong chemical heterogeneity could be provided in MMP magnets. In addition, the Pr-rich phase with a lower melting point enters the MMP magnet, optimizing the composition and structure of the grain boundary (GB) phase. It is beneficial to improve the wettability and promote the formation of continuous GB layers. As a result, the H-cj and (BH)(max) of the MMP magnets reached 9.64 kOe and 37.70 MGOe, leading to an excellent overall magnetic performance of (BH)(max) (MGOe) + H-cj (kOe) = 47.34. This will serve as a reference for the high performance of MMP LaCe-based magnets.