Wen, Qingbo ; Yu, Zhaoju ; Liu, Xingmin ; Bruns, Sebastian ; Yin, Xiaowei ; Eriiksson, Mirva ; Shen, Zhijian James ; Riedel, Ralf (2019):
Mechanical properties and electromagnetic shielding performance of single-source-precursor synthesized dense monolithic SiC/HfCxN1-x/C ceramic nanocomposites.
In: Journal of Materials Chemistry C, 7 (34), pp. 10683-10693. Royal Soc. Chemistry, ISSN 2050-7526,
DOI: 10.1039/c9tc02369k,
[Article]

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 degrees C are reported. The total shielding effectiveness (SET) of the SiC/HfCxN1-x/C monolith is >40 dB at 600 degrees 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 beta-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.

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