Single-source-precursor synthesis and high-temperature evolution of a boron-containing SiC/HfC(N) ceramic micro/nano composite
发布时间：2021-09-03
点击次数：
影响因子：5.3
DOI码：10.1016/j.jeurceramsoc.2020.05.031
发表刊物：Journal of the European Ceramic Society
摘要：A boron-containing SiHfC(N,O) amorphous ceramic was synthesized upon pyrolysis of a single-source-precursor at 1000 °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 sp2-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 β-SiC crystallization. After annealing at temperatures beyond 1900 °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.
合写作者：Ralf Riedel
第一作者：Qingbo Wen
论文类型：期刊论文
通讯作者：Zhaoju Yu, Emanuel Ionescu
学科门类：工学
一级学科：材料科学与工程
文献类型：J
卷号：41
期号：5
页面范围：3002-3012
是否译文：否
发表时间：2021-05-01
收录刊物：SCI
发布期刊链接：https://www.sciencedirect.com/science/article/pii/S0955221920303824
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