Preparation and radar-absorbing properties of Al2O3/TiO2/Fe2O3/Yb2O3 composite powder  

作　　者：Yi-fan Zhang Zhen Ji Ke Chen Cheng-chang Jia Shan-wu Yang Meng-ya Wang 

机构地区：[1]School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2017年第2期216-221,共6页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.51471023);the Major State Basic Research Development Program of China (No.2014GB120000)

摘　　要：Al2O3/TiOe/FeeO3/Yb2O3 composite powder was synthesized via the sol-gel method. The structure, morphology, and ra- dar-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 rim） and the other is spherical A1203 particles （smaller than 80 rim）. 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 increas- ing matching thickness. The effective absorption hand covers the frequency range of 2.16-9.76 GHz, and the maximum absorption peak reaches -20.18 dB with a matching thickness of 3.5 mm at a frequency of 3.52 GHz.Al2O3/TiOe/FeeO3/Yb2O3 composite powder was synthesized via the sol-gel method. The structure, morphology, and ra- dar-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 rim） and the other is spherical A1203 particles （smaller than 80 rim）. 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 increas- ing matching thickness. The effective absorption hand covers the frequency range of 2.16-9.76 GHz, and the maximum absorption peak reaches -20.18 dB with a matching thickness of 3.5 mm at a frequency of 3.52 GHz.

关 键 词：NANOCOMPOSITES radar absorbing materials sol-gel processing electromagnetic wave attenuation 

分 类 号：TB34[一般工业技术—材料科学与工程]