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Microwave Absorption of SiC/HfCxN1−x/C Ceramic Nanocomposites with HfCxN1−x-Carbon Core-Shell Particles

Wen, Qingbo and Feng, Yao and Yu, Zhaoju and Peng, Dong-Liang and Nicoloso, Norbert and Ionescu, Emanuel and Riedel, Ralf and Colombo, P. (2016):
Microwave Absorption of SiC/HfCxN1−x/C Ceramic Nanocomposites with HfCxN1−x-Carbon Core-Shell Particles.
99, In: Journal of the American Ceramic Society, (8), Wiley, pp. 2655-2663, ISSN 00027820, [Online-Edition: http://doi.org/10.1111/jace.14256],
[Article]

Abstract

The dielectric properties of high-temperature stable single-source precursor-derived SiC/HfCxN1−x/C ceramic nanocomposites are determined by microwave absorption in the X-band (8.2–12.4 GHz) at room temperature. The samples synthesized at 1700°C, denoted as SiC/5HfCxN1−x/C-1700°C and SiC/15HfCxN1−x/C-1700°C ceramics, comprising ≈ 1.3 and ≈ 4.2 vol% HfCxN1−x, respectively, show enhanced microwave absorption capability superior to hafnium-free SiC/C-1700°C. The minimum reflection loss of SiC/5HfCxN1−x/C-1700°C and SiC/15HfCxN1−x/C-1700°C are −47 and −32 dB, and the effective absorption bandwidth amount to 3.1 and 3.6 GHz, respectively. Segregated carbon, including graphitic carbon homogeneously dispersed in the SiC matrix and less ordered carbon deposited as a thin film on HfCxN1−x nanoparticles, accounts for the unique dielectric behavior of the SiC/HfCxN1−x/C ceramics. Due to their large reflection loss and their high chemical and temperature stability, SiC/5HfCxN1−x/C-1700°C and SiC/15HfCxN1−x/C-1700°C ceramics are promising candidate materials for electromagnetic interference applications in harsh environment.

Item Type: Article
Erschienen: 2016
Creators: Wen, Qingbo and Feng, Yao and Yu, Zhaoju and Peng, Dong-Liang and Nicoloso, Norbert and Ionescu, Emanuel and Riedel, Ralf and Colombo, P.
Title: Microwave Absorption of SiC/HfCxN1−x/C Ceramic Nanocomposites with HfCxN1−x-Carbon Core-Shell Particles
Language: English
Abstract:

The dielectric properties of high-temperature stable single-source precursor-derived SiC/HfCxN1−x/C ceramic nanocomposites are determined by microwave absorption in the X-band (8.2–12.4 GHz) at room temperature. The samples synthesized at 1700°C, denoted as SiC/5HfCxN1−x/C-1700°C and SiC/15HfCxN1−x/C-1700°C ceramics, comprising ≈ 1.3 and ≈ 4.2 vol% HfCxN1−x, respectively, show enhanced microwave absorption capability superior to hafnium-free SiC/C-1700°C. The minimum reflection loss of SiC/5HfCxN1−x/C-1700°C and SiC/15HfCxN1−x/C-1700°C are −47 and −32 dB, and the effective absorption bandwidth amount to 3.1 and 3.6 GHz, respectively. Segregated carbon, including graphitic carbon homogeneously dispersed in the SiC matrix and less ordered carbon deposited as a thin film on HfCxN1−x nanoparticles, accounts for the unique dielectric behavior of the SiC/HfCxN1−x/C ceramics. Due to their large reflection loss and their high chemical and temperature stability, SiC/5HfCxN1−x/C-1700°C and SiC/15HfCxN1−x/C-1700°C ceramics are promising candidate materials for electromagnetic interference applications in harsh environment.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 99
Number: 8
Publisher: Wiley
Uncontrolled Keywords: Core–shell structures, microwaves, nanocomposites, silicon carbide, dielectric materials/properties
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Aug 2016 08:52
Official URL: http://doi.org/10.1111/jace.14256
Identification Number: doi:10.1111/jace.14256
Funders: Funded by National Natural Science Foundation of China. Grant Number: 50802079, Funded by Natural Science Foundation of Fujian Province of China. Grant Number: 2015J01221, Funded by National Basic Research Program of China. Grant Number: 2012CB933103, Funded by Fundamental Research Funds for the Central Universities. Grant Number: 20720150140, Funded by China Scholarship Council. Grant Number: 201206130059
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