树脂基Fe纳米粒子及碳纤维复合吸波平板的制备与性能

摘要

以Fe纳米粒子(Fe NPs)为吸波剂,偶联剂KH550为表面改性剂,碳纤维(CFs)作为增强及电磁波反射相,环氧树脂(ER)作为基体,制备多种吸波平板并对其综合性能及相关机制进行研究.结果表明:平板的吸波性能随Fe NPs和CFs含量的增加而提高,吸收剂浓度梯度分布有助于形成特定频段的共振吸收;平板对电磁波损耗具有明显的各向异性,表现为CFs垂直电磁波入射方向时性能优于平行情况,当Fe NPs的含量为30％(质量分数,下同),CFs为5.52％,板厚为4.56mm时,最小反射损耗为-26.8dB(4.9GHz);同时,CFs可改善平板的抗弯性能,当Fe NPs为30％时,弯曲强度相比于纯树脂时仅降低了5.81％.%A series of Fe NPs/CFs/ER nanocomposite plates were prepared by using Fe nanoparticles as microwave absorbent,the surface modification of as-prepared Fe nanoparticles was carried out by using silane coupling agents (KH-550),carbon fibers were used to enhance the reflection of electromagnetic waves inside and mechanical properties.The results show that microwave absorption of nanocomposite plates increases with increasing of mass percentage of Fe nanoparticles and carbon fibers,their gradient concentration results in resonance phenomena in specific frequency region.The microwave absorption property is anisotropic,the properties of at the vertical direction of carbon fibers towards incident wave are better than the parallel case,the minimum reflectivity peak value of the nanocomposites with 30％ (mass fraction,the same as below) of Fe NPs and 5.52％ of CFs reaches -26.8dB at 4.9GHz with the matching thickness of 4.56mm.CFs can maintain the bending properties of nanocomposites effectively,the bending strength of the nanocomposite with 30％ Fe NPs is just lower than that with 0％ Fe NPs by 5.81％.