Electromagnetic wave absorption properties of ferrite and graphite cement-based composite materials
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摘要: 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% 60 μm铁氧体、 10 wt% 250 μm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。Abstract: Electromagnetic wave absorption properties of cement-based composite material doped with ferrite and graphite (F/G/C) were investigated. The analysis focused on the main impacting factors of absorption performance and explored the mechanism of its influence by changing ferrite and graphite ratio. The results show that 20vol% graphite causes percolation effect and has great loss tangent. The main influence factor of absorbing depth is graphite, while the main factor impacting absorption width is ferrite. 20wt% 60μm ferrite, 10wt% 250μm ferrite and 30vol% graphtite is the best level combination and its reflectivity reached -32dB, which is obviously better than single form compound. Additionally, graphite doping improved space wave impedance,but the main absorption mechanism is still magnetic loss.
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Key words:
- ferrite /
- graphite /
- cement-based /
- electromagnetic wave absorption /
- impedance matching
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