Mechanical properties and electromagnetic shielding performance of single-source-precursor synthesized dense monolithic SiC/HfCxN1−x/C ceramic nanocomposites. Issue 34 (21st August 2019)

• Record Type: Journal Article
• Authors: Wen, Qingbo; Yu, Zhaoju; Liu, Xingmin; Bruns, Sebastian; Yin, Xiaowei; Eriksson, Mirva; Shen, Zhijian James; Riedel, Ralf
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 34(2019)
• Page Start: 10683
• Page End: 10693
• Publication Date: 2019-08-21
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc02369k
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A fully dense SiC/HfC x N1− x /C ceramic nanocomposite with excellent mechanical properties and high-temperature EM shielding performance up to 600 °C. Abstract : For the first time, single-source-precursor synthesized dense monolithic SiC/HfC x N1− 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/HfC x N1− 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/HfC x N1− x /C monolith possesses superior EM shielding performance due to the presence of a highly conductive HfC x N1− x phase. Moreover, the HfC x N1− 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/HfC x N1− 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/HfC x N1− x /C nanocomposites provides a novel strategy to fabricate EM shielding materials for applications in harsh environments and/or under high mechanical load.