陶瓷
材料科学
反射损耗
热解炭
碳纤维
介电损耗
微波食品加热
电介质
衰减系数
吸收(声学)
吸收带
温度系数
化学工程
复合材料
热解
光电子学
光学
复合数
工程类
物理
量子力学
作者
Yan Song,Pei Liu,Rui Zhou,Runqiu Zhu,Jie Kong
出处
期刊:Carbon
[Elsevier]
日期:2022-03-01
卷期号:188: 12-24
被引量:20
标识
DOI:10.1016/j.carbon.2021.11.051
摘要
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.
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