高比表面积纳米石墨粉的微波吸收性能研究  

Microwave absorption properties of graphite powder with high specific surface area

作　　者：刘曦 张养德 乔亮[2] 叶为春[2] 金增寿 LIU Xi;ZHANG Yangde;QIAO Liang;YE Weichun;JIN Zengshou(Key Laboratory of Opto-Technology and Intelligent Control ministry of Education,Lanzhou Jiaotong University,Lanzhou 730000,China;Institute of Applied Magnetism,Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州交通大学光电技术与智能控制教育部重点实验室,兰州730000 [2]兰州大学磁性与磁性材料教育部重点实验室,兰州730000

出　　处：《功能材料》2020年第5期5070-5075,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(11564024,51731001,11574122)。

摘　　要：利用爆轰法制备了纳米石墨粉,对合成的纳米石墨粉进行形貌、结构和微波性能表征。拉曼光谱和X射线衍射仪结果表明样品为石墨结构,平均粒度在30 nm。TEM结果表明,合成的纳米石墨粉为球形颗粒。通过矢量网络分析仪测试了不同体积分数的纳米石墨粉复合材料的介电常数,并利用传输线理论计算了微波吸波特性,结果表明相同体积分数5%情况下,高比表面积的纳米石墨粉AM4样品相对于含无定形碳的纳米石墨粉W4有更好的阻抗匹配特性,AM4样品在C波段可达到最大反射损失为-40 dB。Nanometer graphite powder was prepared by detonation method.The nanometer graphite powder was characterized.Raman spectra and X-ray diffractometer showed that the sample was graphite with an average particle size of 30 nm.TEM results showed that the synthesized nanometer graphite powder was spherical.Composite materials with different volume fractions were prepared.The dielectric constant was measured by vector network analyzer and the wave absorption performance was calculated.The results show that the sample of nanometer graphite powder AM4 with high specific surface area had better impedance matching characteristics than the sample of W4 with amorphous carbon at the same volume fraction of 5%,and the maximum reflection loss of AM4 sample at C-band was-40 dB.

关 键 词：纳米石墨粉 爆轰法 吸波性能 

分 类 号：TB33[一般工业技术—材料科学与工程]