Synthesis and enhanced microwave absorption properties of BaM-P/BaM-T/PVB ternary composite with ordered inter-filled structure
Synthesis and enhanced microwave absorption properties of BaM-P/BaM-T/PVB ternary composite with ordered inter-filled structure
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有序互填充结构BaM-P/BaM-T/PVB三元复合材料的合成及增强微波吸收性能
DOI：
10.1007/s10854-018-8769-x
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发表时间：
2018-05-01
影响因子：
2.8
通讯作者：
Zhang, Chao
中科院分区：
文献类型：
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作者：
He, Li;Zhao, Yuchen;Zhang, Chao
颗粒状铁氧体填料BaFe_（12）O_（19）（BaM-P）通常作为EMA复合材料中的辅助材料，但单独使用时表现出较弱的电磁波吸收能力（RL >-10 dB）。在这项工作中，有序填充铁氧体/聚合物复合材料已通过一个通用的流延成型方法。采用两步熔盐法制备微米级BaFe 12 O 19模板粒子（BaM-T），并将其定向均匀嵌入BaM-P/聚乙烯醇缩丁醛（PVB）复合材料中，形成具有层状微观结构的BaM-T/BaM-P/PVB三元复合材料。该复合材料显示出极大增强的EMA性能，拓宽了有效EMA带宽。最佳样品在6.6 GHz处的反射损耗最小为-45.8 dB，有效EMA带宽（RL <-10 dB）为3-18 GHz，厚度为2-5 mm。在厚度为1.8 mm时，获得了4.16 GHz的最大有效EMA带宽。有限元模拟表明，取向BaM-T薄片形成的强势垒界面通过特定的多次反射机制有效地提高了吸收强度，减小了样品厚度。此外，从纳米到微米的大范围的填料粒径可以使有效带宽被加宽。这项工作表明了铁氧体材料在EMA应用中的巨大潜力。
The granular ferrite fillers like BaFe12O19 (BaM-P) usually work as an auxiliary material in the EMA composite, but shows weak electromagnetic wave absorbing (EMA) capability (RL > - 10 dB) when single used. In this work, an orderly filled ferrite/polymer composite has been made by a versatile tape casting method. The micron BaFe12O19 template particles (BaM-T) were obtained by a two-step molten salt method and were oriented and uniformly inserted into the BaM-P/polyvinyl butyral (PVB) composite to form a BaM-T/BaM-P/PVB ternary composite with laminated micro-structure. The composite shows greatly enhanced EMA properties with broadening effective EMA bandwidth. The optimal sample displayed a minimum reflection loss of - 45.8 dB at 6.6 GHz and effective EMA bandwidth (RL < - 10 dB) of 3-18 GHz with 2-5 mm thick. The maximum effective EMA bandwidth of 4.16 GHz was obtained at the thickness of 1.8 mm. Finite element simulation verified that, the strong barrier interfaces attributed by the oriented BaM-T flakes can effectively improve absorptive intensity and decrease sample thickness via a particular multiple reflection mechanism. Additionally, the large range of filler particle size from nano to micro can make the effective bandwidth to be broadened. This work demonstrates the great potential of the ferrite materials for EMA application.