SiBNCx ceramics derived from single source polymeric precursor with controllable carbon structures for highly efficient electromagnetic wave absorption at high temperature

• Published in: Carbon (New York) 2022-03, Vol.188, p.12-24
• Main Authors: Song, Yan, Liu, Pei, Zhou, Rui, Zhu, Runqiu, Kong, Jie
• Format: Article
• Language: English
• Subjects: Adjustable dielectric properties; Ammonia; Ammonolysis; Bandwidths; Carbon; Carbon content; Ceramics; Controllable carbon content; Dielectric properties; Electromagnetic radiation; Electromagnetics; High temperature; High temperature electromagnetic performance; Microwave absorption; Molecular structure; Phase composition; Polymerization; Precursor derived ceramic; Prepolymers; Reflectance; Room temperature; Superhigh frequencies; Wave reflection
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2021.11.051

Precursor derived ceramic with controllable carbon content has the advantages of high temperature and adjustable dielectric properties, which has significant potential for the research the high temperature microwave absorbing materials. In this contribution, a series of single-source SiBNCx precursors are obtained using NH3, n-butylamine, and dichlorodiphenylsilane with n-butylamine as the carbon source ammonolysis trichlorosilylamino-dichloroborane (TADB) monomer and polymerization. Adjusting the carbon content of precursors directly leads to phase composition and performance differences of SiBNCx ceramics. For SiBNCx ceramics with no carbon or low-carbon content, it had almost no effect on electromagnetic waves. The transmission rate ranged from 98% to 78% in 2–18 GHz. When SiBNCx ceramics with carbon-rich structure, the tanδ of pyrolytic ceramics increased significantly, which has an obvious loss on electromagnetic wave. The minimum reflection coefficient (RCmin) values reached −64.75 dB, and the effective absorption bandwidth (EAB) was 3.8 GHz in the X band at room temperature. Importantly, EAB of the SiBNCx ceramics still cover more than 50% of the X band, RCmin can be as low as −24.9 dB at 600 °C. The strategy offers a new method to accurately control high temperature electromagnetic performance from molecular structure. [Display omitted] •A series of SiBNCx precursors with different carbon structures are synthesized.•SiBNCx ceramics with no carbon or low-carbon content have good transmission rate to EM wave.•SiBNCx ceramics with carbon-rich structure has an obvious loss on EM wave.•SiBNCx ceramics have an excellent high temperature EM performance.