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采用放电等离子烧结技术制备了各向异性微米晶SmCo_5磁体,研究了磁体的烧结工艺及添加Fe纳米粉对磁体结构和磁性能的影响。研究发现,SmCo_5烧结磁体的最佳烧结温度为830℃,此时磁体的室温磁性能最佳:B_r=8.19 kGs,H_(cj)=10.6 kOe,(BH)_(max)=13 MGOe;而添加Fe纳米粉的烧结磁体,饱和磁化强度升高,但剩磁和矫顽力降低。XRD结果表明,未添加Fe纳米粉的烧结磁体具有单相CaCu_5结构,而添加Fe纳米粉的烧结磁体出现了2∶17相和Fe-Co软磁相。SEM及能谱分析发现,添加的Fe纳米粉扩散进入了1∶5相,形成Sm(Fe,Co)_5和Sm_2(Fe,Co)_(17))。
The anisotropic SmCo_5 magnet was prepared by spark plasma sintering. The sintering process of the magnet and the effect of adding Fe nanopowder on the structure and magnetic properties of the magnet were studied. The results show that the optimum sintering temperature of SmCo_5 sintered magnet is 830 ℃, and the best magnetic properties at room temperature are: B_r = 8.19 kGs, H_ (cj) = 10.6 kOe, (BH) _ (max) = 13 MGOe; The sintered magnet with Fe nanopowder added has higher saturation magnetization but lower remanence and coercivity. The results of XRD show that the sintered magnet without Fe nano-powder has a single-phase CaCu_5 structure, whereas the sintered magnet with Fe nano-powder shows the 2:17 phase and the Fe-Co soft phase. SEM and EDS analysis showed that the Fe nanopowders diffused into the 1: 5 phase to form Sm (Fe, Co) 5 and Sm 2 (Fe, Co) _ (17).