Coercivity optimization of hot-deformed Nd-Fe-B magnets by addition of B_(19.23)Fe_(80.77) particles

摘要

Hot-deformed Nd-Fe-B magnets with and without B-Fe particles are prepared to investigate the effect of B-Fe particles on the magnetic properties. After the addition of 0.5 wt% B-Fe particles, the coercivity of the hot-deformed magnet is increased. It is found that B-Fe particles inhibits the abnormal growth of grains around the melt-spun ribbons' boundaries results in fine grains. Besides, by further annealing, the fine grains have a modification effect on the boundary, which reduces the demagnetization nucleation field, thereby further optimizing the coercivity of the magnet.