CAJ | 학술논문

The waste sintered Nd-Fe-B magnets were regenerated as magnetic powders via manually crushing (MC) or hydrogen de-crepitation (HD) to fabricate anisotropic bonded magnets. Effect of size distribution on the magnetic properties of the regenerated magnetic MC and HD powders was investigated. For the MC powders, as the particle size decreased, the remanence (Br) increased first, and then decreased again, while the coercivity (Hci) dropped monotonically. The powders with particle size in the range of 200–450μm possessed the best magnetic properties ofBr of 1.22 T andHci of 875.6 kA/m. The corresponding bonded magnet exhibited magnetic properties ofBr of 0.838 T,Hci of 940.9 kA/m, and (BH)max of 91.4 kJ/m3, respectively. On the other hand, the HD powders with particle size range of 200-450μm bore the best magnetic properties ofBr of 1.24 T andHci of 860.4 kA/m. Compared with magnetic proper-ties of the waste magnet, the powders retained 93.9% ofBr and 70.0% ofHci, respectively. The bonded magnet produced from HD powders possessedBr of 0.9 T,Hci of 841.4 kA/m, and (BH)max of 111.6 kJ/m3, indicating its good potential in practical applications.