摘要
从经典的Maxwell-Garnett公式出发,在考虑颗粒间相互作用的情况下,推导具有核-壳结构的四氧化三铁/导电聚苯胺球形填料复合体系的等效电磁参数的计算公式。数值分析结果表明,随着填料占空比的增加,表征颗粒周围媒质的磁导率μh的值越大,并且随频率的下降速度比低占空比的情况缓慢。在核壳比不同的情况下,复合材料的等效电磁参数产生超交换作用的电磁耦合共振现象,从而使2mm厚的吸波涂层在填料核壳比为0.6时的吸波效能达到最大,并随着填料占空比的增加,反射率的峰值增大且向低频处移动。优化结果表明,占空比为0.3时的四层吸波复合结构具有最佳的吸波效能,其反射率的最小值达到-62dB。
In consideration of the interactions of F3O4/ conductive polyaniline nanocomposites with core-shell structure, the effective electromagnetic parameter formula of the composite system was derived from the classical Maxwell-Garnett formula. The numerical simulation results show that the permeability of the surrounding media （μh） increases with the increasing volume fraction. The super-exchange electromagnetic coupling resonance phenomena of the electromagnetic parameter has made the microwave absorbing structure with the thickness of 2mm reach the maximum microwave attenuation when the proportion of core/shell is 0.6, and with the increasing volume fraction, the maximum microwave absorption peak increases and shifts to low frequency. The optimization results show that the four-level microwave absorbing structure with volume fraction of 0.3 has the optimal absorbing property and the minimum of reflectivity is -62dB.
出处
《航空材料学报》
EI
CAS
CSCD
2008年第4期82-87,106,共7页
Journal of Aeronautical Materials
关键词
核-壳结构
等效电磁参数
吸波性能
优化
core-shell structure
effective electromagnetic parameter
microwave absorbing property
optimization
