多壁碳纳米管/双马来酰亚胺树脂复合材料的制备及其电磁性能

Synthesis and Electromagnetic Properties of MWCNT/BMI Composites

采用化学气相沉积（CVD）法,在1000℃、氮气保护气氛下,制备了铁-钴-镍混合粉末掺杂的多壁碳纳米管（m-MWCNTs,m=Fe-Co-Ni）。再以m-MWCNTs作为吸波剂,双马来酰亚胺（BMI）树脂为基体,制备出m-MWCNTs/BMI复合吸波材料。使用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、矢量网络分析仪等对复合材料的微观结构和电磁性能进行表征和测试分析。结果表明,m-MWCNTs作为吸波剂,对电磁波既有介电损耗,也有较强的磁损耗;在2~18 GHz频率范围内,当m-MWCNTs质量分数为8%时,2 mm厚度复合材料的电磁反射损耗在频率为12.96 GHz处达到–12.63d B,频率带宽（低于–5d B）达到5.2 GHz,表明m-MWCNTs/BMI复合吸波材料具有良好的电磁参数匹配特性。

Multi-walled carbon nanotubes doped with the mixture of iron, cobalt, nickel （m-MWCNTs, m=Fe-Co-Ni） were prepared by a CVD method under nitrogen atmosphere at 1000 ℃. m-MWCNT/bismaleimide （BMI） composites were prepared with m-MWCNTs as absorber and BMI resin as matrix materials. The microstructure and electromagnetic properties of the m-MWCNT/BMI composites were characterized and analyzed by X-ray diffraction （XRD） apparatus, scanning electron microscopy （SEM） and the vector network analyzer. The results show that m-MWCNTs as absorber have both dielectric loss and strong magnetic loss. When the content of m-MWCNTs is up to 8 wt% and the thickness of the composite is 2 mm, the reflection loss of this composite reaches to -12.63 dB at 12.96 GHz, and also show an increasing trend, indicating the well-matched electromagnetic parameters.