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A novel single-source-precursor for SiC-TaC-C nanocomposites was successfully synthesized by the chemical reaction between a polycarbosilane (allylhydridopolycarbosilane, AHPCS) and tantalum(V) chloride (TaCl5), which was confirmed by Fourier transform infrared spectra (FTIR) measurement. After pyrolysis of the resultant single-source-precursors at 900 ℃, amorphous ceramic powders were obtained. The 900 ℃ ceramics were annealed at different temperatures in the range of 1200-1600 ℃ to gain SiC-TaC-C nanocomposites. The phase evolution of ceramic nanocomposites was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results indicate that the TaC starts to crystallize at lower temperature than the β-SiC. It is particularly worth pointing out that the unique core-shell structured TaC@C nanoparticles were in-situ formed and homogeneously distributed in the ceramic matrix after annealing at 1400 ℃. Even at a high temperature of 1600 ℃, the grain sizes of β-SiC and TaC are smaller than 30 nm, fulfilling the definition of nanocomposites. The present study related to SiC-TaC-C nanocomposites paves a new road for enriching ultra-high temperature ceramic family suitable for structural/functional applications in harsh environment.


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Single-source-precursor synthesis and phase evolution of SiC-TaC-C ceramic nanocomposites containing core-shell structured TaC@C nanoparticles

Show Author's information Zhaoju YUa,b( )Yujing YANGaKangwei MAOaYao FENGcQingbo WENc( )Ralf RIEDELc
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
Technische Universität Darmstadt, Institut für Materialwissenschaft, Darmstadt 64287, Germany

Abstract

A novel single-source-precursor for SiC-TaC-C nanocomposites was successfully synthesized by the chemical reaction between a polycarbosilane (allylhydridopolycarbosilane, AHPCS) and tantalum(V) chloride (TaCl5), which was confirmed by Fourier transform infrared spectra (FTIR) measurement. After pyrolysis of the resultant single-source-precursors at 900 ℃, amorphous ceramic powders were obtained. The 900 ℃ ceramics were annealed at different temperatures in the range of 1200-1600 ℃ to gain SiC-TaC-C nanocomposites. The phase evolution of ceramic nanocomposites was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results indicate that the TaC starts to crystallize at lower temperature than the β-SiC. It is particularly worth pointing out that the unique core-shell structured TaC@C nanoparticles were in-situ formed and homogeneously distributed in the ceramic matrix after annealing at 1400 ℃. Even at a high temperature of 1600 ℃, the grain sizes of β-SiC and TaC are smaller than 30 nm, fulfilling the definition of nanocomposites. The present study related to SiC-TaC-C nanocomposites paves a new road for enriching ultra-high temperature ceramic family suitable for structural/functional applications in harsh environment.

Keywords:

polymer-derived ceramics, TaC, SiC, nanocomposites, core-shell structure
Received: 06 January 2020 Revised: 17 February 2020 Accepted: 27 February 2020 Published: 05 June 2020 Issue date: June 2020
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Publication history
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Publication history

Received: 06 January 2020
Revised: 17 February 2020
Accepted: 27 February 2020
Published: 05 June 2020
Issue date: June 2020

Copyright

© The Author(s) 2020

Acknowledgements

Zhaoju Yu thanks the National Natural Science Foundation of China (No. 51872246) for financial support.

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