Fe/Fe_(3)C/Fe_(3)O_(4)@C磁性微球的制备及吸波性能研究EI北大核心CSCD

薄、轻、宽、强是人们对高效电磁波吸收材料的追求。用食品级柠檬酸铁与蔗糖经过水热反应,高温煅烧制备Fe/Fe_(3)C/Fe_(3)O_(4)@C磁性微球,并通过改变柠檬酸铁与蔗糖的摩尔比,探究柠檬酸铁的含量对复合材料吸波性能的影响,有效地调控电磁参数,从而优化阻抗匹配。实验结果表明,当柠檬酸铁与蔗糖的摩尔比为5∶3时,具有较好的吸波性能:当厚度为2.5 mm时,最小反射损耗为-50.17 dB,小于-10 dB的有效吸收频宽为3.52 GHz,优异的电磁波吸收性能主要得益于微球丰富的界面、孔状结构和Fe/Fe_(3)C/Fe_(3)O_(4)磁学性能的协同作用。

Preparation and absorbing properties of Fe/Fe3C/Fe3O4@C magnetic microspheres

Thinness, lightness, width, strength are people's pursuit of efficient electromagnetic wave (EMW) absorption materials. Fe/Fe₃C/Fe₃O₄@C magnetic microspheres were prepared by high temperature calcination of food-grade ferric citrate and source through hydrothermal reaction. By changing the molar ratio of ferric citrate and sucrose, the influence of the content of ferric citrate on the EMW absorption performance of the composite was investigated, and the electromagnetic parameters were effectively controlled to optimize impedance matching. The experimental results show that when the molar ratio of iron citrate and sucrose is 5:3, it has better EMW absorption performance: when the thickness is 2.5 mm, the minimum reflection loss (RL) is -50.17 dB, and the effective absorption band width less than -10 dB is 3.52 GHz. The excellent EMW performance is mainly due to the synergistic effect of the rich interface, porous structure and magnetic properties of Fe/Fe₃C/Fe₃O₄.