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Journal of Advanced Ceramics 2020, 9(5): 617-628 https://doi.org/10.1007/s40145-020-0401-x
Research Article | Open Access | Issue | Published: 10 October 2020

Role of in-situ formed free carbon on electromagnetic absorption properties of polymer-derived SiC ceramics

Show Author's Information Zhaoju YUa,b( ),  Xuan LVa,  Kangwei MAOa,  Yujing YANGa,  Anhua LIUa,b,c( )
College of Materials, Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen 361005, China
College of Materials, Fujian Key Laboratory of Advanced Materials (Xiamen University), Xiamen 361005, China
Shenzhen Research Institute of Xiamen University, Shenzhen 518000, China
Keywords:
dielectric properties, polymer-derived ceramics (PDCs), microstructural evolution, electromagnetic properties
Cite this article:
YU Z, LV X, MAO K, et al. Role of in-situ formed free carbon on electromagnetic absorption properties of polymer-derived SiC ceramics. Journal of Advanced Ceramics, 2020, 9(5): 617-628. https://doi.org/10.1007/s40145-020-0401-x
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Abstract Full text About this article

In order to enhance dielectric properties of polymer-derived SiC ceramics, a novel single-source-precursor was synthesized by the reaction of an allylhydrido polycarbosilane (AHPCS) and divinyl benzene (DVB) to form carbon-rich SiC. As expected, the free carbon contents of resultant SiC ceramics annealed at 1600 ℃ are significantly enhanced from 6.62 wt% to 44.67 wt%. After annealing at 900-1600 ℃, the obtained carbon-rich SiC ceramics undergo phase separation from amorphous to crystalline feature where superfine SiC nanocrystals and turbostratic carbon networks are dispersed in an amorphous SiC(O) matrix. The dielectric properties and electromagnetic (EM) absorption performance of as-synthesized carbon-rich SiC ceramics are significantly improved by increasing the structural order and content of free carbon. For the 1600 ℃ ceramics mixed with paraffin wax, the minimum reflection coefficient (RCmin) reaches -56.8 dB at 15.2 GHz with the thickness of 1.51 mm and a relatively broad effective bandwidth (the bandwidth of RC values lower than -10 dB) of 4.43 GHz, indicating the excellent EM absorption performance. The carbon-rich SiC ceramics have to be considered as harsh environmental EM absorbers with excellent chemical stability, high temperature, and oxidation and corrosion resistance.


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About this article

Role of in-situ formed free carbon on electromagnetic absorption properties of polymer-derived SiC ceramics

Show Author's information Zhaoju YUa,b( ), Xuan LVa, Kangwei MAOa, Yujing YANGa, Anhua LIUa,b,c( )
College of Materials, Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen 361005, China
College of Materials, Fujian Key Laboratory of Advanced Materials (Xiamen University), Xiamen 361005, China
Shenzhen Research Institute of Xiamen University, Shenzhen 518000, China

Abstract

In order to enhance dielectric properties of polymer-derived SiC ceramics, a novel single-source-precursor was synthesized by the reaction of an allylhydrido polycarbosilane (AHPCS) and divinyl benzene (DVB) to form carbon-rich SiC. As expected, the free carbon contents of resultant SiC ceramics annealed at 1600 ℃ are significantly enhanced from 6.62 wt% to 44.67 wt%. After annealing at 900-1600 ℃, the obtained carbon-rich SiC ceramics undergo phase separation from amorphous to crystalline feature where superfine SiC nanocrystals and turbostratic carbon networks are dispersed in an amorphous SiC(O) matrix. The dielectric properties and electromagnetic (EM) absorption performance of as-synthesized carbon-rich SiC ceramics are significantly improved by increasing the structural order and content of free carbon. For the 1600 ℃ ceramics mixed with paraffin wax, the minimum reflection coefficient (RCmin) reaches -56.8 dB at 15.2 GHz with the thickness of 1.51 mm and a relatively broad effective bandwidth (the bandwidth of RC values lower than -10 dB) of 4.43 GHz, indicating the excellent EM absorption performance. The carbon-rich SiC ceramics have to be considered as harsh environmental EM absorbers with excellent chemical stability, high temperature, and oxidation and corrosion resistance.

Keywords: dielectric properties, polymer-derived ceramics (PDCs), microstructural evolution, electromagnetic properties

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Publication history
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Publication history

Received: 25 February 2020
Revised: 28 June 2020
Accepted: 30 June 2020
Published: 10 October 2020
Issue date: October 2020

Copyright

© The author(s) 2020

Acknowledgements

This study was supported by the National Natural Science Foundation of China (No. 51872246) and Shenzhen Science and Technology Projects (JCYJ20180306172957494).

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