碳纳米管/膨胀石墨复合材料制备及其8mm波衰减性能  

Preparation of Carbon Nanotube/Expanded Graphite Composite Material and Its 8 mm Wave Attenuation Properties

作　　者：张倩[1,2] 焦清介[2] 宣兆龙[1] 李天鹏[1] 俞卫博[1] 

机构地区：[1]军械工程学院弹药工程系,河北石家庄050003 [2]北京理工大学爆炸科学与技术国家重点试验室,北京100081

出　　处：《兵工学报》2011年第12期1510-1513,共4页Acta Armamentarii

基　　金：国家自然科学基金项目(50842054);军械工程学院科研基金项目(JJJXM08022)

摘　　要：通过高温下膨化多壁碳纳米管(MW CNTs)与可膨胀石墨混合物的方法,制得一种高导电率8 mm波干扰材料。采用扫描电镜(SEM)、振动样品磁强计(VSM)和欧姆计等对其微观形貌和电磁性能进行了表征,采用测试样板法对其8 mm波二维静态衰减性能进行了测试。结果表明:高温热处理过程改变了碳纳米管(CNTs)的管状结构,熔化的CNTs呈膜状分布于膨胀石墨(EG)的表层和层间孔隙;CNTs的加入,增加了EG的表面电导率和对电磁波的衰减,但并未改变EG的抗磁特性,该复合材料对电磁波的衰减仍以散射和电吸收损耗为主;该复合材料8 mm波二维静态衰减效果明显优于纯的EG,CNTs质量添加量为29%时,衰减能力最强(11.68 dB),继续增大比例,复合材料对8 mm波衰减能力降低。A kind of 8 mm wave interference composite with high conductivity is prepared by expanding the mixture of multi-walled carbon nanotubes（MW CNTs） and expansible graphite（EG）under the condition of high temperature.The microstructure and electromagnetic properties are characterized by using scan electron microscope（SEM）,vibrancy sample magnetometer（VSM） and ohmmeter.The 8 mm wave two dimension static attenuation performances are studied by using the method of test samples.The results show that the tubular structure of carbon nanotubes（CNTs）is changed by the high temperature process and the melting CNTs with membranous shape distribute on the surface and interformational pores of EG;the surface conductivity and electromagnetic wave attenuation increases due to the addition of CNTs,but the diamagnetic characteristic of EG is not changed;the attenuation of electromagnetic wave is mainly caused by the scattering and electromagnetic absorption of the composite;and the 8 mm wave attenuation performance of the composite is better than the pure EG;the 8 mm wave attenuation reaches to maximum（11.68 dB） when the addition weight of CNTs is 29%.With the increase of CNTs,the attenuation performances descend.

关 键 词：复合材料 军事化学与烟火技术 膨胀石墨复合材料 多壁碳纳米管 毫米波干扰 电磁特性 

分 类 号：TB332[一般工业技术—材料科学与工程] TB34