Preparation and radar-absorbing properties of Al2O3/TiO2/Fe2O3/Yb2O3 composite powder
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第2期
论文作者：Yi-fan Zhang Zhen Ji Ke Chen Cheng-chang Jia Shan-wu Yang Meng-ya Wang
文章页码：216 - 221
摘 要：Al2O3/Ti O2/Fe2O3/Yb2O3 composite powder was synthesized via the sol–gel method. The structure,morphology,and radar-absorption properties of the composite powder were characterized by transmission electron microscopy,X-ray diffraction analysis and RF impedance analysis. The results show that two types of particles exist in the composite powder. One is irregular flakes（100–200 nm） and the other is spherical Al2O3 particles（smaller than 80 nm）. Electromagnetic wave attenuation is mostly achieved by dielectric loss. The maximum value of the dissipation factor reaches 0.76（at 15.68 GHz） in the frequency range of 2–18 GHz. The electromagnetic absorption of waves covers 2–18 GHz with the matching thicknesses of 1.5–4.5 mm. The absorption peak shifts to the lower-frequency area with increasing matching thickness. The effective absorption band covers the frequency range of 2.16–9.76 GHz,and the maximum absorption peak reaches-20.18 d B with a matching thickness of 3.5 mm at a frequency of 3.52 GHz.
Yi-fan Zhang，Zhen Ji，Ke Chen，Cheng-chang Jia，Shan-wu Yang，Meng-ya Wang
School of Materials Science and Engineering,University of Science and Technology Beijing
摘 要：Al2O3/Ti O2/Fe2O3/Yb2O3 composite powder was synthesized via the sol–gel method. The structure,morphology,and radar-absorption properties of the composite powder were characterized by transmission electron microscopy,X-ray diffraction analysis and RF impedance analysis. The results show that two types of particles exist in the composite powder. One is irregular flakes（100–200 nm） and the other is spherical Al2O3 particles（smaller than 80 nm）. Electromagnetic wave attenuation is mostly achieved by dielectric loss. The maximum value of the dissipation factor reaches 0.76（at 15.68 GHz） in the frequency range of 2–18 GHz. The electromagnetic absorption of waves covers 2–18 GHz with the matching thicknesses of 1.5–4.5 mm. The absorption peak shifts to the lower-frequency area with increasing matching thickness. The effective absorption band covers the frequency range of 2.16–9.76 GHz,and the maximum absorption peak reaches-20.18 d B with a matching thickness of 3.5 mm at a frequency of 3.52 GHz.
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