Grain refinement technology reduces local stray fields by decreasing magnet grain size, thereby achieving the dual objectives of reducing heavy rare earth usage while enhancing magnet coercivity. Our company has developed fine-grained magnets through optimized techniques in smelting, powder preparation, fine powder forming, and sintering, thereby improving the intrinsic properties of the magnets.

The coercivity of sintered neodymium-iron-boron magnets is not only related to the intrinsic properties of the magnet but also closely linked to its microstructure. The composition, type, and distribution of grain boundary phases significantly influence the magnet's coercivity. Therefore, optimizing the grain boundaries to enhance coercivity has become a key strategy for improving material performance. Our company achieves this by precisely designing the proportion of trace element additions and combining this with optimized sintering and aging processes. This results in grain boundary phases that are continuously distributed, uniformly thick, and possess specific structural organization. Consequently, we obtain grain boundaries with excellent microstructures, thereby achieving enhanced magnet performance.