碳纳米管加载量对复合材料吸波性能的影响

Effect of carbon nanotube content on the radar absorbing properties of carbon nanotube/resin composites

将不同质量分数的碳纳米管和环氧树脂充分混合,制成复合吸波涂料并涂覆在铝板上制成吸波涂层。采用TEM对碳纳米管的形貌进行观察。使用反射率扫频测量系统HP8757E标量网络分析仪检测复合材料的吸波性能。结果表明,复合材料在2GHz^18GHz均有良好的吸波性能。碳纳米管加载质量分数为8%和10%时,复合材料吸波性能最佳。8%碳纳米管加载量,峰值最大,达到~22.55dB,波峰出现在12.32GHz,带宽分别为2.56GHz(R<-8dB)和4.00GHz(R<-5dB)。10%碳纳米管添加量,带宽最大,分别达到2.80GHz(R<-8dB)和7.00GHz(R<-5dB),波峰出现在13.67GHz,峰值为-14.59dB。

The radar wave absorbing properties of carbon nanotube based composites were investigated. Carbon nanotubes were added to epoxy resin with different weights and dispersed by sonication to prepare radar absorption composite materials （RAM）. Then the composite paste was put into an aluminium pan to form the test sample. Carbon nanotubes were characterized by TEM and radar absorbing properties were obtained by the arc reflectivity method. Results indicate that carbon nanotubes have excellent radar absorbing properties in the waveband of 2-18 GHz. The best parameters are obtained using mass fraction carbon nanotube additions of 8% and 10%. The highest absorbing peak of -22.55 dB at 12.32 GHz is obtained for the composite with an addition of 8% carbon nanotubes and the composite has a bandwidth of 2.56 GHz at R 〈 - 8 dB and 4.00 GHz at R 〈 - 5 dB. With an addition of 10%, the absorbing peak of - 14.59 dB is located at 13.67 GHz with the largest bandwidths of 2.80GHz at R〈 -8dB and 7.00GHz at R〈 -5dB.