Fe3O4@锂铝硅微晶玻璃/还原氧化石墨烯复合材料的制备和吸波性能

《复合材料学报》优先在线发表论文。

摘  要：为了改善传统磁性吸波材料的阻抗匹配和提升吸波性能，将传统的磁性材料Fe3O4及透波材料锂铝硅微晶玻璃(LAS)与还原氧化石墨烯(RGO)进行复合，使它们的介电损耗和磁损耗互补，制得Fe3O4@锂铝硅微晶玻璃/还原氧化石墨烯电磁波吸收复合材料。采用三步法制备Fe3O4@LAS/RGO磁性吸波复合材料，并通过多种测试手段对其结构、形貌和组成进行表征，并分析其电磁参数和吸波性能。研究了基体氧化石墨(GO)添加量对Fe3O4@LAS/RGO复合材料的形成和吸波性能的影响，随着GO含量的增加，Fe3O4@LAS纳米球的分布变得稀疏，RGO堆叠程度变大。GO与Fe3O4@LAS（Fe3O4/LAS摩尔比为1:0.2）质量比为40:100复合时，Fe3O4@LAS/RGO复合材料有最佳吸波性能，反射损耗在12.4 GHz处达到-65 dB，且仅需要2.1 mm的匹配厚度。在该厚度下小于-10 dB（超过90%的电磁波被材料吸收）的反射损耗达到了4 GHz。锂铝硅微晶玻璃作为涂覆在Fe3O4纳米球表面的透波层，引入了多重透射-吸收机制。

关键词：Fe3O4；锂铝硅微晶玻璃；还原氧化石墨烯；电磁波吸收；介电损耗

Abstract: In order to improve the impedance matching of traditional magnetic absorbing materials and improve the electromagnetic wave absorption performance, the ternary composites, composed of magnetic material Fe3O4, a wave-transparent material lithium aluminum silicate (LAS) glass-ceramic and reduced graphene oxide (RGO), were prepared by three-step method. The structure, morphology and composition of the Fe3O4@LAS/RGO composites were characterized by various test methods, and the electromagnetic parameters and microwave absorbing properties were also analyzed. The effects of the addition amount of graphite oxide (GO) on the formation and microwave absorbing properties of the Fe3O4@LAS/RGO composites were investigated. As the amount of GO increases, the distribution of Fe3O4@LAS nanospheres becomes sparse, and the degree of stacking of reduced graphene oxide increases. When the mass ratio of GO to Fe3O4@LAS (the molar ratio of Fe3O4/LAS is 1:0.2) is 40:100, the Fe3O4@LAS/RGO composite has the best microwave absorbing performance. The reflection loss reaches -65 dB at 12.4 GHz with a thickness of 2.1 mm and the absorption bandwidth with the reflection loss values less than -10 dB (more than 90% of electromagnetic waves are absorbed by materials) is up to 4 GHz at the corresponding thickness. Lithium aluminum silicate glass ceramic, having wave-transparent properties, can introduce a multiple transmission-absorption mechanism into the Fe3O4@LAS/RGO composites.

Keywords: Fe3O4; lithium aluminum silicate glass ceramic; reduced graphene oxide; electromagnetic wave absorption;  dielectric losses

作者：杨亚楠等，哈尔滨工业大学威海 材料科学与工程学院，威海

通讯作者：夏龙，哈尔滨工业大学威海 材料科学与工程学院，威海

全文详见中国知网学术期刊优先数字出版。