Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第7期    总第256期    2020年7月

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文章编号:1004-0609(2020)-07-1626-08
羰基铁/NiLa0.02Fe1.98O4双层宽频吸波体的构建及实现
刘 渊1,吴晋瑞1,王 莹2

(1. 火箭军工程大学,西安 710025;
2. 江苏金环环保设备有限公司,宜兴 214200
)

摘 要: 根据电磁波传输线理论和阻抗匹配原理,设计羰基铁(CIP)/NiLa0.02Fe1.98O4双层复合吸波材料,并以环氧树脂为基体制备相应的性能优异的吸波涂层。使用XDR和SEM对粉末和涂层的结构进行表征。通过同轴法测定CIP和NiLa0.02Fe1.98O4的电磁参数,借助MATLAB软件,计算面层与底层不同厚度和不同次序条件下的反射率。结果表明:NiLa0.02Fe1.98O4作为面层,CIP作为底层时可以极大地拓展涂层的吸收带宽和减小反射率峰值。以NiLa0.02Fe1.98O4为面层,CIP为底层,厚度分别为1.5和0.6 mm时,涂层的吸波效果最好,反射率峰值为-38.2 dB,小于-10 dB频宽为13.4 GHz。制备的涂层中吸波剂总体分散良好,无明显缺陷。通过实验值和理论值的比较,验证优化结果的准确性,实现在较小厚度和较宽频带下,吸波涂层有较强吸收的要求。

 

关键字: 吸波材料;阻抗匹配;双层;电磁性能

Preparation and design of carbonyl iron/NiLa0.02Fe1.98O4 double layer absorber
LIU Yuan1, WU Jing-rui1, WANG Yin2

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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