文献类型：期刊文献

英文题名：Dielectric-tunable carbon-quartz blended fiber/silicone aerogel composites for ultra-broadband microwave absorption: Synergy of conductivity control and multilayered architecture engineering

作者：Wang, Xueyang[1,2];Tian, Xuanye[1];Tian, Hao[1];Luo, Yi[2];Li, Guixiang[2];Niu, Bo[1,2];Su, Zhe[2];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tech, Shanghai 200237, Peoples R China;[2]Suzhou Lab, Struct Mat Res Dept, Suzhou 215000, Peoples R China

年份：2026

卷号：285

外文期刊名：COMPOSITES SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20263221276159);Scopus(收录号：2-s2.0-105046867014);WOS:【SCI-EXPANDED(收录号:WOS:001847808000001)】；

基金：This work was supported by National Natural Science Foundation of China (U2341291 and 52472095) and Fundamental and Interdisci-plinary Disciplines Breakthrough Plan of the Ministry of Education of China (JYB2025XDXM407) .

语种：英文

外文关键词：Carbon fibers; Electrical conductivity control; Electromagnetic wave absorption; Multilayered structure

摘要：Developing advanced carbon fiber-based electromagnetic wave (EMW) absorbing materials is crucial for electromagnetic protection and stealth. However, achieving broadband absorption remains challenging due to severe impedance mismatch arising from excessively high conductivity of carbon fiber. Herein, we report carbon-quartz blended fibers/silicone aerogel composites (CF-QF/SAs) with controlled conductivity and multilayered architecture to improve impedance matching for broadband EMW absorption. The graphitization degree and chemical components of carbon fibers are tailored via low-temperature carbonization of pre-oxidized polyacrylonitrile (PAN), enabling tunable electrical conductivity. Blending with quartz fibers at specific ratios further adjusts dielectric properties, establishing a continuously tunable permittivity system. When combined with silicone aerogel, the synergistic effects of conductive and polarization loss yield superior EMW absorption performance, achieving a minimum reflection loss (RLmin) of-56.1 dB and an effective absorption bandwidth (EAB) of 6.6 GHz. Furthermore, an impedance-gradient incorporating a sandwich structure is innovatively proposed for fabricating multilayered composites. Simulation confirms that this design effectively improves impedance matching and attenuation capacity. The optimized composite achieves an ultra-broad EAB of 37.4 GHz, covering 2.5-39.9 GHz. The composite also demonstrates excellent mechanical properties with tensile strength of 12.2 MPa and thermal insulation properties with low thermal conductivity of 0.051 W m-1 K-1. Moreover, the composite exhibits outstanding high-temperature resistance, retaining superior absorption even after exposure to 800 degrees C for 1000 s. This work satisfies the multifunctional requirements for broadband stealth and thermal insulation in practical engineering applications.