The microstructure and electromagnetic wave absorption properties of near-stoichiometric SiC fibre
The microstructure and electromagnetic wave absorption properties of near-stoichiometric SiC fibre
复制标题
近化学计量碳化硅纤维的微观结构及电磁波吸收性能
DOI：
10.1016/j.ceramint.2016.11.158
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发表时间：
2017-02-15
影响因子：
5.2
通讯作者：
Cheng, Laifei
中科院分区：
文献类型：
--
作者：
Liu, Xiaofei;Zhang, Litong;Cheng, Laifei
对近化学计量比SiC纤维（C/Si比为1.125）的微观结构和电磁性能进行了详细的分析和评价。SiC纤维由β-SiC纳米晶和游离碳组成，具有独特的皮芯结构，表面碳层厚度为5 nm。相对复介电常数随着纤维体积分数从13体积%增加到27.5体积%而增加。在10 GHz时，由于SiC纳米晶和界面的生成，介电常数虚部从1.36增加到2.13。随着纤维体积分数的增加，复合材料的电磁波吸收性能增强，当纤维体积分数为27.5vol%时，复合材料的有效吸收带宽约为2.6GHz。
The microstructure and electromagnetic (EM) properties of near-stoichiometric SiC fibres (with C/Si ratio of 1.125) were analyzed and evaluated in detail. The SiC fibres consisted of beta-SiC nanocrystallines and free carbon, and exhibited a uniquely specific skin-core structure with thin carbon layer of 5 nm on their surfaces. The relative complex permittivity increased with the increasing fibre volume fraction from 13 vol% to 27.5 vol%. The imaginary part of permittivity increased from 1.36 to 2.13 at 10 GHz, due to more SiC nanocrystallines and interfaces generating. The EM wave absorption properties were enhanced by the increasing fibre volume fraction and the effective absorption bandwidth was approximately 2.6 GHz when the fibre volume fraction was 27.5 vol%.