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Issue 34, 2019
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Mechanical properties and electromagnetic shielding performance of single-source-precursor synthesized dense monolithic SiC/HfCxN1−x/C ceramic nanocomposites

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Abstract

For the first time, single-source-precursor synthesized dense monolithic SiC/HfCxN1−x/C ceramic nanocomposites with outstanding electromagnetic (EM) shielding performance at temperatures up to 600 °C are reported. The total shielding effectiveness (SET) of the SiC/HfCxN1−x/C monolith is >40 dB at 600 °C, which is superior than most of the reported EM shielding materials under the same conditions. Compared with a Hf-free SiC/C monolith, the SiC/HfCxN1−x/C monolith possesses superior EM shielding performance due to the presence of a highly conductive HfCxN1−x phase. Moreover, the HfCxN1−x-particles are covered by a carbon layer forming core–shell nanoparticles connected with graphite-like carbon ribbons, which result in electrically conductive networks within the semiconducting β-SiC matrix. In addition, the hardness, Young's modulus and flexural strength of the dense SiC/HfCxN1−x/C monolith are measured to be 29 ± 4 GPa, 381 ± 29 GPa and 320 ± 25 MPa, respectively. The outstanding EM shielding performance combined with excellent mechanical properties of the dense monolithic SiC/HfCxN1−x/C nanocomposites provides a novel strategy to fabricate EM shielding materials for applications in harsh environments and/or under high mechanical load.

Graphical abstract: Mechanical properties and electromagnetic shielding performance of single-source-precursor synthesized dense monolithic SiC/HfCxN1−x/C ceramic nanocomposites

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Supplementary files

Article information


Submitted
05 May 2019
Accepted
13 Aug 2019
First published
14 Aug 2019

J. Mater. Chem. C, 2019,7, 10683-10693
Article type
Paper

Mechanical properties and electromagnetic shielding performance of single-source-precursor synthesized dense monolithic SiC/HfCxN1−x/C ceramic nanocomposites

Q. Wen, Z. Yu, X. Liu, S. Bruns, X. Yin, M. Eriksson, Z. J. Shen and R. Riedel, J. Mater. Chem. C, 2019, 7, 10683
DOI: 10.1039/C9TC02369K

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