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

Wen, Qingbo and Yu, Zhaoju and Liu, Xingmin and Bruns, Sebastian and Yin, Xiaowei and Eriiksson, Mirva and Shen, Zhijian James and Riedel, Ralf (2019):
Mechanical properties and electromagnetic shielding performance of single-source-precursor synthesized dense monolithic SiC/HfCxN1-x/C ceramic nanocomposites.
7, In: Journal of Materials Chemistry C, (34), Royal Soc. Chemistry, pp. 10683-10693, ISSN 2050-7526, DOI: 10.1039/c9tc02369k,
[Online-Edition: https://pubs.rsc.org/en/content/articlelanding/2019/TC/C9TC0...],
[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.

Item Type: Article
Erschienen: 2019
Creators: Wen, Qingbo and Yu, Zhaoju and Liu, Xingmin and Bruns, Sebastian and Yin, Xiaowei and Eriiksson, Mirva and Shen, Zhijian James and Riedel, Ralf
Title: Mechanical properties and electromagnetic shielding performance of single-source-precursor synthesized dense monolithic SiC/HfCxN1-x/C ceramic nanocomposites
Language: English
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.

Journal or Publication Title: Journal of Materials Chemistry C
Volume: 7
Number: 34
Publisher: Royal Soc. Chemistry
Uncontrolled Keywords: ELASTIC PROPERTIES; CARBON; COMPOSITES; MICROSTRUCTURE; FABRICATION; HARDNESS; SICN; NANOINDENTATION; LIGHTWEIGHT; BEHAVIOR
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Date Deposited: 19 Sep 2019 05:32
DOI: 10.1039/c9tc02369k
Official URL: https://pubs.rsc.org/en/content/articlelanding/2019/TC/C9TC0...
Projects: Technische Universitat Darmstadt, National Natural Science Foundation of Chiina, Grant Number 51872246, Creative Research Foundation of Science, Technology on Thermostructural Composite Materials Laboratory, Grant Number 6142911040114, Alexander von Humboldt Foundation
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