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针对碳微球电磁吸波效果比较差的问题,采用原位还原法制得铁磁性钴包覆碳微球的核壳结构复合颗粒,分别将40%(wt,质量分数)的碳微球和碳微球/钴核壳结构颗粒与石蜡混合,制得测试样品。实验结果表明,与碳微球相比,碳微球/钴核壳结构颗粒的最小反射损耗从-30.8dB增加到-49.7dB,增加了61.4%;反射损耗从11.46GHz移动到10.67GHz,吸收峰向低频移动了6.9%。这主要是因为碳微球/钴核壳结构可以带来更多的界面电荷极化和界面反射,从而增强了对电磁波的吸收强度。
Aiming at the poor electromagnetic wave absorption effect of carbon microspheres, the core-shell composite particles of ferromagnetic cobalt-coated carbon microspheres were prepared by in-situ reduction method, respectively 40% (wt, mass fraction) Microspheres / cobalt core shell structure particles were mixed with paraffin to prepare test samples. The experimental results show that the minimum reflection loss of carbon microspheres / cobalt core-shell structure particles increases from -30.8dB to -49.7dB, an increase of 61.4% compared with that of carbon microspheres; the reflection loss shifts from 11.46GHz to 10.67GHz, and the absorption The peak moved 6.9% to the low frequency. This is mainly because the carbon microsphere / cobalt core shell structure can bring more interface charge polarization and interface reflection, thereby enhancing the absorption of electromagnetic waves.