Effect of SiO2 on Wave Absorbing Performance of CI/CB Coating
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摘要: 以羰基铁和炭黑分别用于匹配层和吸收层制备了具有阻抗渐变结构(匹配层+吸收层)的1.2 mm厚环氧树脂基吸波涂层。通过在匹配层中加入透波剂SiO2,改善了吸波涂层的阻抗匹配性。随着SiO2在匹配层中含量的增加,涂层的反射损耗(RL)得到增强。当匹配层中SiO2与羰基铁及环氧树脂的比值为2∶5∶1时,涂层的吸收峰值达到-17.3 dB,涂层有效带宽(RL<-4 dB)达到5.7 GHz。Abstract: Epoxy resin based double-layer composite coatings (matching layer and absorbing layer) with impedance gradient structure were prepared with thickness of 1.2 mm, employing carbonyl iron (CI) and carbon black (CB) as absorbents in the matching layer and absorption layer respectively, in which SiO2 was introduced into the matching layer as wave-transmission material to improve the matching impendence. With increasing SiO2 content in the matching layer, the reflection loss (RL) was enhanced in the frequency range 2 ~ 18 GHz. The optimized SiO2, CI and resin weight ratio (SiO2: CI: ER) was 2:5:1, when the optimal RL got to- 17.3 dB and the effective absorption band (RL <- 4 dB) reached 5.7 GHz.
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Keywords:
- SiO2 /
- carbonyl iron /
- absorbing coatings /
- matching impendence
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