摘要
依据传输线理论和阻抗匹配原则,设计并制备了一种以磁性金属微粉为面层、多壁碳纳米管为底层、玻璃纤维布为环氧树脂基体增强体的低频段双层结构型吸波复合材料。采用透射电镜和扫描电镜对多壁碳纳米管和磁性金属微粉的微观形貌进行了表征,采用HP8722ES矢量网络分析仪测量了材料在2～18GHz频率范围内的复介电常数和复磁导率,采用弓形法测试了复合材料在2～8GHz扫频范围内的反射率特性。研究表明,该双层结构型吸波复合材料在低频S波段具有良好的吸波效果,当其匹配厚度为dm=4.0mm时,最大吸收峰在3.08GHz时达到-17dB,反射率小于-10dB的频宽为1.82GHz。
According to transmission line theory and impedance matching principal, a kind of double-layer absorbing composite reinforced by glass fiber cloth was prepared. The surface layer and last layer are composed of magnetic metal powder and multi-walled carbon nanotubes（MWCNTs）, respectively. Magnetic metal powder and MWC- NTs were characterized by transmission electron microscopy and scanning electron microscopy. The electromagnetic parameters of absorbers were investigated in the frequency range of 2- 18GHz. The microwave absorbing properties of double-layer composite were measured in the frequency range of 2-8GHz. The results of experimental measurement show that the double-layer composite has good absorbing performance in low frequency region. The maximum reflectivity（R） is about -17dB at 3. 08GHz with the matching thickness of 4. 0mm, correspondingly, the bandwidth below -10dB is 1.82GHz.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2011年第20期70-73,共4页
Materials Reports
基金
河南省教育厅自然科学研究计划项目(2011A430017)
洛阳理工学院博士科研启动基金(2009BZ20)
关键词
多壁碳纳米管
磁性金属微粉
结构型复合材料
吸波性能
multi-walled carbon nanotubes, magnetic metal powder, double-layer composites, microwave absorbing properties
