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

Yu, Zhaoju and Yang, Yujing and Mao, Kangwei and Feng, Yao and Wen, Qingbo and Riedel, Ralf (2020):
Single-source-precursor synthesis and phase evolution of SiC-TaC-C ceramic nanocomposites containing core-shell structured TaC@C nanoparticles.
In: Journal of Advanced Ceramics, 9 (3), pp. 320-328. Springer, ISSN 2226-4108, e-ISSN 2227-8508,
DOI: 10.1007/s40145-020-0371-z,
[Article]

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 degrees C, amorphous ceramic powders were obtained. The 900 degrees C ceramics were annealed at different temperatures in the range of 1200-1600 degrees C 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 beta-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 degrees C. Even at a high temperature of 1600 degrees C, the grain sizes of beta-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.

Item Type: Article
Erschienen: 2020
Creators: Yu, Zhaoju and Yang, Yujing and Mao, Kangwei and Feng, Yao and Wen, Qingbo and Riedel, Ralf
Title: Single-source-precursor synthesis and phase evolution of SiC-TaC-C ceramic nanocomposites containing core-shell structured TaC@C nanoparticles
Language: English
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 degrees C, amorphous ceramic powders were obtained. The 900 degrees C ceramics were annealed at different temperatures in the range of 1200-1600 degrees C 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 beta-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 degrees C. Even at a high temperature of 1600 degrees C, the grain sizes of beta-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.

Journal or Publication Title: Journal of Advanced Ceramics
Journal volume: 9
Number: 3
Publisher: Springer
Uncontrolled Keywords: polymer-derived ceramics; TaC; SiC; nanocomposites; core-shell structure MECHANICAL-PROPERTIES; OXIDATION BEHAVIOR; COMPOSITES; HF; MICROSTRUCTURE; DENSIFICATION; PERFORMANCE; FABRICATION; SILICON; ZR
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
Date Deposited: 23 Jun 2020 06:19
DOI: 10.1007/s40145-020-0371-z
Official URL: https://link.springer.com/article/10.1007/s40145-020-0371-z
Projects: National Natural Science Foundation of China, Grant Number 51872246
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