(1. 火箭軍工程大學，西安 710025；
2. 江蘇金環(huán)環(huán)保設(shè)備有限公司，宜興 214200)
摘 要: 根據(jù)電磁波傳輸線理論和阻抗匹配原理，設(shè)計羰基鐵(CIP)/NiLa0.02Fe1.98O4雙層復(fù)合吸波材料，并以環(huán)氧樹脂為基體制備相應(yīng)的性能優(yōu)異的吸波涂層。使用XDR和SEM對粉末和涂層的結(jié)構(gòu)進行表征。通過同軸法測定CIP和NiLa0.02Fe1.98O4的電磁參數(shù)，借助MATLAB軟件，計算面層與底層不同厚度和不同次序條件下的反射率。結(jié)果表明：NiLa0.02Fe1.98O4作為面層，CIP作為底層時可以極大地拓展涂層的吸收帶寬和減小反射率峰值。以NiLa0.02Fe1.98O4為面層，CIP為底層，厚度分別為1.5和0.6 mm時，涂層的吸波效果最好，反射率峰值為-38.2 dB，小于-10 dB頻寬為13.4 GHz。制備的涂層中吸波劑總體分散良好，無明顯缺陷。通過實驗值和理論值的比較，驗證優(yōu)化結(jié)果的準確性，實現(xiàn)在較小厚度和較寬頻帶下，吸波涂層有較強吸收的要求。
關(guān)鍵字: 吸波材料；阻抗匹配；雙層；電磁性能
（1. Xi’an Research Institute of High Technology, Xi’an 710025, China;
2. Jiangsu Jinhuan Environmental Protection Equipment Co., Ltd., Yixing 214200, China）
Abstract:The carbonyl iron (CIP)/NiLa0.02Fe1.98O4 double layer composite absorber was designed based on the electromagnetic transmission line theory and impedance matching principle, and the microwave absorbing coating with high performance was prepared based on epoxy resin. XRD and SEM were used to characterize the structure of the powder and coating. The coaxial method was used to mensurate the electromagnetic parameters of CIP and NiLa0.02Fe1.98O4. The reflectances of the surface layer and the bottom layer under the conditions of different thickness and different orders were calculated by using MATLAB software. The results show that, taking NiLa0.02Fe1.98O4 as a surface layer and CIP as the bottom layer can greatly expand the coating absorption bandwidth and decrease the reflectance peak. While NiLa0.02Fe1.98O4 for surface layer, CIP for the bottom layer, with a thickness of 1.5mm and 0.6 mm, respectively, the absorbing effect of the coating is the best, the reflectance peak is -38.2 dB, and the bandwidth, which is less than -10 dB, is 13.4 GHz. The absorbents overall dispersion in the coating prepared meets the requirement, there are no obvious defects that exist. By comparison of the experimental and theoretical values, the accuracy of the optimal results is verified, thus, the requirements of microwave coatings strong absorption with a lesser thickness and the wideband are met.
Key words: absorbing materials; impedance matching; double layer; electromagnetic property
