Microwave Absorption and Shielding, Property of Composites with FeSiA1 and Carbonous Materials as Filler

材料科学技术（英）, 2012, 28(10): 913-919.

Microwave Absorption and Shielding, Property of Composites with FeSiA1 and Carbonous Materials as Filler

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1.Bionic and Micro/Nano/Bio Manufacturing Technology Research Center, School of Mechanical Engineering and Au-tomation, Beihang University, Beijing 100191~ China

2.Bionic and Micro/Nano/Bio Manufacturing Technology Research Center, School of Mechanical Engineering and Au-tomation, Beihang University, Beijing 100191~ China

3.Bionic and Micro/Nano/Bio Manufacturing Technology Research Center, School of Mechanical Engineering and Au-tomation, Beihang University, Beijing 100191~ China

4.Bionic and Micro/Nano/Bio Manufacturing Technology Research Center, School of Mechanical Engineering and Au-tomation, Beihang University, Beijing 100191~ China

5.Bionic and Micro/Nano/Bio Manufacturing Technology Research Center, School of Mechanical Engineering and Au-tomation, Beihang University, Beijing 100191~ China

基金项目: the National High Technology Research and Development Program of China(＂863 Program＂, 2009AA043804) the Foun-dation for the Author of National Excellent Doctoral Dis-sertation of PR China(2007B32) the Innovation Foundation of BUAA for Ph.D. Graduates the National Natural Sci-ence Foundation of China(50805005)

关键词：石墨复合材料 , 屏蔽效能 , 微波吸收 , 碳质材料 , 多壁碳纳米管 , 填充物 , 矢量网络分析仪 , 电导率测定

Microwave Absorption and Shielding, Property of Composites with FeSiA1 and Carbonous Materials as Filler

Keywords： Absorbing materials , Electromagnetic , Reflection loss , Shielding effectiveness ,

Silicone rubber composites filled with FeSiAI alloys and multi-walled carbon nanotubes (MWCNT)/graphite have been prepared for the first time by a coating process. The complex permittivity and permeability of the composites were measured with a vector network analyzer in a 1-4 GHz frequency range, and the DC electric conductivity was measured by a standard four-point contact method. These parameters were then used to calculate the reflection loss (RL) and shielding effectiveness (SE) of the composites. The results showed that the added MWCNT increased the permittivity and permeability of composites in the L-band, while the added graphite increased only the permittivity. The variation lies in the interactions between two carbonous absorbents. Addition of 1 wt% MWCNT enhanced the RL in the L-band (minimum -5.7 dB at 1 ram, -7.3 dB at 1.5 ram), while the addition of graphite did not. Addition of MWCNT as well as graphite reinforced the shielding property of the composites (maximum SE 13.3 dB at 1 ram, 18.3 dB at 1.5 ram) owing to the increase of conductivity. The addition of these carbonous materials could hold the promise of enforcing the absorption and shielding property of the absorbers.

参考文献

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Microwave Absorption and Shielding, Property of Composites with FeSiA1 and Carbonous Materials as Filler

Microwave Absorption and Shielding, Property of Composites with FeSiA1 and Carbonous Materials as Filler

参考文献