期刊
CERAMICS INTERNATIONAL
卷 48, 期 8, 页码 10391-10402出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.12.106
关键词
SiC; Powders; Gas phase reaction; Nanocomposites; Microwave absorption
资金
- National Natural Science Foundation of China [12075242, 11675177, 11705202]
The one-step, continuous, and controllable synthesis of SiC/C nanocomposites was achieved using atmospheric thermal plasma. The microwave absorption performance of the nanocomposites was improved by adjusting the carbon content. These results provide a new strategy for designing and synthesizing SiC/C nanocomposites with strong microwave absorption.
The simple preparation of SiC/C nanocomposites for efficient microwave absorption is a significant and challenging issue. In this work, an atmospheric thermal plasma was used to achieve the one-step, continuous, and controllable synthesis of SiC/C nanocomposites via hexamethyldisilane decomposition. The microstructure, phase composition, elemental composition, and microwave absorption performance of the SiC/C nanocomposites were investigated. The results indicated that the as-prepared SiC/C nanocomposites were a mixture of C-coated beta-SiC nanoparticles with an average size of 11-16 nm and free carbon layers with the layer number of 1-6. The ratio of SiC to carbon layers could be tuned by adjusting the arc current, hydrogen/carbon contents. It was also found that the SiC/C nanocomposites with high carbon content exhibited good microwave absorption, and the optimal reflection loss approached-60.6 dB at 7.39 GHz. The microwave absorption mechanism indicated that the presence of carbon layers in the SiC/C nanocomposites improved the polarization and conduction loss, which was closely associated with the enhanced microwave absorption. These results afford a novel strategy for designing and synthesizing SiC/C nanocomposites with strong microwave absorption.
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