多壁碳纳米管/环氧树脂复合材料雷达波吸收性能

Microwave Absorbing Property of MWNTs/epoxy Composites

为了研究多壁碳纳米管/环氧树脂复合材料的微波吸收性能,将原生、镀钴多壁碳纳米管和NaOH高温活化处理分别分散到环氧树脂中制成3种多壁碳纳米管/环氧树脂吸波复合材料,并用透射电子显微镜(TEM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)对多壁碳纳米管进行了微观表征;用弓型法测量了它们在2.0 GHz-18.0GHz频段内的雷达吸波性能。测量数据表明,3种不同的吸波复合材料的主吸收峰处于不同的频段。原生碳纳米管/环氧树脂复合材料的主吸收峰位于C频段4.48 GHz处,镀钴多壁碳纳米管/环氧树脂复合材料和NaOH高温活化处理碳纳米管/环氧树脂复合材料的吸收峰都向高频移动,分别位于X频段10.72 GHz和Ku频段15.6 GHz处,吸收强度和吸收带宽也有所提高。这对于调整雷达吸波材料的吸波频段和拓宽吸波频宽有着重要意义。

In order to study MWNTs/epoxy composites of the microwave absorption properties, MWNTs were activated by NaOH at high - temperature and were coated by colbat, respectively. Their morphology and microstructure were characterized and measured by using TEM, SEM and XRD. The microwave absorbing properties of three kinds （ raw MWNTs, NaOH - activated MWNTs and the Co - coated MWNTs） of MWNTs/epoxy composites were meas- ured. It has been found that the maximum absorbing peak of raw MWNT/epoxy composite appeared at C frequency area,and the maximum absorbing peak of Co - coated MWNTs/epoxy composite and NaOH - activated MWNTs / epoxy composite have been shifted to X and Ku frequency area, respectively, which indicates that by different treatment of MWNTs,the absorbing peak of an composite can be well adjusted.