91°µÍø

Pr2Co14B permanent magnets were prepared by mechanical milling of the arc-melted ingot. X-ray diffraction analysis revealed the presence of 2:14:1 phase after 1 hour milling which transformed into an amorphous phase with additional milling time. Increasing the milling time also lowered the intrinsic coercivity while the saturation magnetization increased up to 105 emu/g. Differential scanning calorimetry measurements revealed a crystallization temperature of around 560 ËšC. Upon annealing 30 hours of as-milled amorphous powders between 500-900 ËšC, we observed the precipitation of 2:14:1 phase. The optimum post-milling annealing temperature was 600 ËšC with an intrinsic coercivity of 7 kOe and maximum energy product of 6 MGOe.