Microwave absorbing properties of 3D printed carbonyl powder/polydimethylsiloxane flexible composite
ZHANG Xueting1,2, ZHOU Yi1, XIAO Wei2, TIAN Zhaoxia2, LIU Fenghua2
1. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China; 2. Zhejiang Key Laboratory of Additive Manufacturing Materials, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Abstract：The printing ink was prepared by mixing flake carbonyl iron powder (FCI) and spherical carbonyl iron powder (SCI) with polydimethylsiloxane (PDMS), respectively. The carbonyl iron powder/polydimethylsiloxane (CIP/PDMS) flexible composite microwave absorbing material was formed by 3D printing with ink direct writing. The effects of the morphology and content of carbonyl iron powder (CIP) on the rheological behavior of ink and 3D direct writing printing process were studied. The electromagnetic reflection loss of CIP/PDMS composite microwave absorbing material was studied as well by CST Studio Suite electromagnetic simulation software. The results show that the higher the CIP content, the better the microwave absorption performance of the composite. When w(FCI) is 30%, the FCI/PDMS composite has the best microwave absorption performance. When the thickness is 1.8 mm, it has the strongest absorption peak for the electromagnetic wave with frequency of 10.9 GHz, the peak value is -34.8 dB, and the effective absorption bandwidth (EAB, RL<-10 dB) is 4.8 GHz. When w(SCI) is 80%, SCI/PDMS composite has the best microwave absorption performance. When the thickness is 2.4 mm, it has the strongest absorption peak for electromagnetic wave with frequency of 7.3 GHz, the peak is -41.5 dB and EAB is 3.6 GHz.
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2022, Vol. 27 
