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采用高压和常规压制方式制备了烧结(PrNd)33Al0.7Nb0.6Cu0.1B1.05Febal(质量分数)永磁体,利用扫描电镜、金相显微镜和振动样品磁强计及维氏硬度计对比研究了两种压制方式对样品微观组织和性能的影响。结果发现:与常规压制方式制备样品相比,1.8GPa压强成型制备样品的Hcj和(BH)max分别提高了133kA.m-1和0.6kJ.m-3;而3.6GPa压强成型制备样品的Hcj和(BH)max分别提高了120.3kA.m-1和3.2kJ.m-3。高压样品的主相晶粒较细小,富稀土相分布均匀合理,但过高的压强将使其维氏硬度降低。
Sintered (PrNd) 33Al0.7Nb0.6Cu0.1B1.05Febal (mass fraction) permanent magnets were prepared by high pressure and conventional pressing method. The microstructure of the sintered magnets was characterized by scanning electron microscopy (SEM), optical microscope, vibrating sample magnetometer and Vickers hardness tester. Effect of Different Pressing Methods on Microstructure and Properties of Samples. The results showed that the Hcj and (BH) max of the sample prepared by 1.8GPa pressure molding were increased by 133kA.m-1 and 0.6kJ.m-3, respectively, compared with those prepared by the conventional pressing method. However, the Hcj And (BH) max increased by 120.3kA.m-1 and 3.2kJ.m-3, respectively. The main phase grains of the high-pressure sample are smaller and the distribution of rare earth-rich phase is uniform and reasonable, but the excessive pressure will reduce the Vickers hardness.