Effects of Hot Pressing and Deforming on the Microstructure and Properties of NdFeB Magnets
Time: 2019/6/20 Hits: 1803
In this paper, the NdFeB magnets were prepared by hot pressing and deforming, the influence of pressing temperature, pressing strain, deforming temperature, deforming rate and amount on the density, hardness and magnetic properties of magnets were analyzed with the microstructure analysis. The results show that the density of the magnets and the hardness increase with the increase of the hot pressing temperature and pressure, but the hardness decreases when the pressing temperature reaches 800 ℃ .After thermal deformation, the gap of the magnets reduced, the density is increased, the hardness becomes larger, and the grains are oriented in the direction of deformation, which leads to higher magnetic properties. However, when the deformation rate is too low, or the deformation temperature is too high, there is an abnormal phenomenon of grain growth, leading to the decrease of coercivity and harness of the material.
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