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研究了添加铁氧体和石墨水泥基复合材料(F/G/C)的吸波性能。通过改变铁氧体、石墨的配比,分析了影响该材料电磁吸收效能的主要因素,并探讨了其影响机制。结果表明:石墨添加量20 vol%时材料出现逾渗现象,逾渗区内介电损耗有较大值;0.5～4 GHz范围内影响吸收深度的最主要因素是石墨,影响吸收宽度的最主要因素是铁氧体,最佳水平组合为20 wt%60μm铁氧体、10 wt%250μm铁氧体、30 vol%石墨,吸收深度可达-32 dB且明显优于单组分复合;吸收主要机制是磁损耗,石墨的加入改善了材料空间波阻抗。
The microwave absorbing properties of ferrite and graphite cement-based composites (F / G / C) were studied. By changing the ratio of ferrite and graphite, the main factors influencing the electromagnetic absorption efficiency of the material were analyzed and the mechanism of its influence was discussed. The results show that when the content of graphite is 20 vol%, the material appears percolation, and the dielectric loss in percolation zone is larger. The most important factor affecting the absorption depth in the range of 0.5-4 GHz is graphite, the most important factor affecting the absorption width The factor is ferrite, the best combination is 20wt% 60μm ferrite, 10wt% 250μm ferrite, 30vol% graphite, the absorption depth can reach -32 dB and is obviously superior to single component compound; The mechanism is magnetic loss, graphite added to improve the material space wave impedance.