文献类型：期刊文献

英文题名：Trilaminar impedance-gradient design of lightweight silicone aerogel composites via dielectric-tunable fiber preforms for broadband microwave absorption

作者：Wang, Xueyang[1,2];Tian, Hao[1];Tian, Xuanye[1];Luo, Yi[2];Niu, Bo[1,2];Zhang, Kaili[2,3];Su, Zhe[2];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Suzhou Lab, Struct Mat Res Dept, Suzhou 215000, Peoples R China;[3]Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

年份：2026

卷号：275

外文期刊名：COMPOSITES SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20255119744065);WOS:【SCI-EXPANDED(收录号:WOS:001645578300001)】；

基金：This work was supported by Basic research projects of CNSA (JCKY2023204A002) .

语种：英文

外文关键词：Electromagnetic wave absorption; Impedance gradient structure; Broadband absorption; Lightweight stealth

摘要：Electromagnetic wave (EMW) absorbers are crucial for advanced stealth and electromagnetic protection, yet achieving broadband microwave absorption in single-layer configurations remain challenge. Herein, a trilaminar impedance gradient structure (IGS) consisting of matching layer, absorbing layer and reflecting layer has been introduced into lightweight silicone aerogel composites for broadband microwave absorption. Conductive carbon nanofibers are deliberately sprayed onto thin quartz fiber felts, endowing composites with tunable and designable dielectric properties. These composites exhibit a wide permittivity range (epsilon(y) from 2.2 to 14.5, epsilon(y) from 0.13 to 13.3), achieving a transition of EMW attenuation from weak to strong. By regulating the permittivity of each composite layers, the composite with IGS have optimized impedance matching and enhanced attenuation capacity, achieving an effective absorption bandwidth (EAB) of 12.7 GHz, covering the frequency range of 5.3-18 GHz. Moreover, the lightweight composites exhibits good tension strength of 12.1 MPa and low thermal conductivity of 0.045 W m-1 K-1, which satisfies the multi-functional requirements for lightweight stealth and thermal insulation in practical engineering applications.