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Single-source-precursor synthesis and high-temperature evolution of a boron-containing SiC/HfC ceramic nano/micro composite

Wen, Qingbo ; Yu, Zhaoju ; Riedel, Ralf ; Ionescu, Emanuel (2021):
Single-source-precursor synthesis and high-temperature evolution of a boron-containing SiC/HfC ceramic nano/micro composite.
In: Journal of the European Ceramic Society, 41 (5), pp. 3002-3012. Elsevier Science Ltd., ISSN 0955-2219,
DOI: 10.1016/j.jeurceramsoc.2020.05.031,
[Article]

Abstract

A boron-containing SiHfC(N,O) amorphous ceramic was synthesized upon pyrolysis of a single-source-precursor at 1000 degrees C in Ar atmosphere. The high-temperature microstructural evolution of the ceramic at high temperatures was studied using X-ray powder diffraction, Raman spectroscopy, solid-state nuclear magnetic resonance spectroscopy and transmission electron microscopy. The results show that the ceramic consists of an SiHfC(N,O)-based amorphous matrix and finely dispersed sp(2)-hybridized boron-containing carbon (i.e. ByC). High temperature annealing of ByC/SiHfC(N,O) leads to the precipitation of HfCxN1-x nanoparticles as well as to beta-SiC crystallization. After annealing at temperatures beyond 1900 degrees C, HfB2 formation was observed. The incorporation of boron into SiHfC(N,O) leads to an increase of its sintering activity, consequently providing dense materials possessing improved mechanical properties as compared to those of boron-free SiC/HfC. Thus, hardness and elastic modulus values up to 25.7 +/- 5.3 and 344.7 +/- 43.0 GPa, respectively, were measured for the dense monolithic SiC/HfCxN1-x/HfB2/C ceramic nano/micro composite.

Item Type: Article
Erschienen: 2021
Creators: Wen, Qingbo ; Yu, Zhaoju ; Riedel, Ralf ; Ionescu, Emanuel
Title: Single-source-precursor synthesis and high-temperature evolution of a boron-containing SiC/HfC ceramic nano/micro composite
Language: English
Abstract:

A boron-containing SiHfC(N,O) amorphous ceramic was synthesized upon pyrolysis of a single-source-precursor at 1000 degrees C in Ar atmosphere. The high-temperature microstructural evolution of the ceramic at high temperatures was studied using X-ray powder diffraction, Raman spectroscopy, solid-state nuclear magnetic resonance spectroscopy and transmission electron microscopy. The results show that the ceramic consists of an SiHfC(N,O)-based amorphous matrix and finely dispersed sp(2)-hybridized boron-containing carbon (i.e. ByC). High temperature annealing of ByC/SiHfC(N,O) leads to the precipitation of HfCxN1-x nanoparticles as well as to beta-SiC crystallization. After annealing at temperatures beyond 1900 degrees C, HfB2 formation was observed. The incorporation of boron into SiHfC(N,O) leads to an increase of its sintering activity, consequently providing dense materials possessing improved mechanical properties as compared to those of boron-free SiC/HfC. Thus, hardness and elastic modulus values up to 25.7 +/- 5.3 and 344.7 +/- 43.0 GPa, respectively, were measured for the dense monolithic SiC/HfCxN1-x/HfB2/C ceramic nano/micro composite.

Journal or Publication Title: Journal of the European Ceramic Society
Journal volume: 41
Number: 5
Publisher: Elsevier Science Ltd.
Uncontrolled Keywords: Polymer-derived ceramic nanocomposites, Silicon carbide, Hafnium carbide, High-temperature, UHTCs
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: 12 Mar 2021 07:08
DOI: 10.1016/j.jeurceramsoc.2020.05.031
Official URL: https://www.sciencedirect.com/science/article/abs/pii/S09552...
Additional Information:

Part of Special Issue: Science of High-Temperature Ceramic-matrix Composites

Projects: Technische Universitat Darmstadt, National Natural Science Foundation of China (NSFC), Grant Number 51872246, Alexander von Humboldt Foundation, German Research Foundation (DFG), European Commission, Grant Number IO 64/14-1
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