Effect of Annealing on the Magnetism of the Sintered NdFeB Magnet

Effect of annealing on the magnetism of the sintered NdFeB magnet was studied.The results show that annealing can raise the magnetism of the sintered NdFeB magnet.When the sintered NdFeB magnet was annealed at 3Pa and 492℃ for an hour,the coercive force H_c would raise from 11.5kOe to 14.63kOe,and the (BH)_(max) would raise from 35MGOe to 43.9MGOe.