The Effects of Post Heat Treatment on the NdFeB Magnet Prepared by Spark Plasma Sintering

As of a new method,spark plasma sintering(SPS) technique has been introduced into in the field of NdFeB preparation due to its own advantages.The effects of post heat treatment on the magnetic properties of SPS NdFeB magnets were investigated.Meanwhile,the effects of post heat treatment on the microstructure and dimensional precision of the SPS NdFeB magnets were also studied.The NdFeB magnets with fine grains and high property were prepared under the condition of proper post heat treatment.The results show that the magnetic properties of SPS NdFeB can be further improved through proper post heat treatment.The studies also demonstrate that it is feasible to prepare near-net-shape NdFeB magnets with fine grains and high property by spark plasma sintering.