Solid-solution effects on the high-temperature oxidation behavior of polymer-derived (Hf,Ta)C/SiC and (Hf,Ti)C/SiC ceramic nanocomposites
发布时间：2021-09-04
点击次数：
影响因子：3.86
发表刊物：Advanced Engineering Materials
摘要：In the present study, two concepts to improve the oxidation resistance at high-temperatures of ceramic nanocomposites consisting of 85–90 vol% SiC, 5–8 vol% group IV metal carbides (i.e., HfC, TaC), and 5–7 vol% carbon are introduced and discussed. First improvement concept relates to the passivation of the samples upon short-term oxidation at 1400 °C (30 min). This is a critical step, especially with respect to silica formation, which is relatively sluggish at temperatures lower than 1000–1200 °C. Moreover, solid-solution metal carbides (Hf,Ta)C and (Hf,Ti)C are shown to be clearly more oxidation resistant than the binary HfC and TaC phases. Whereas, the solid-solution effect contributes to a significant improvement of the short-term oxidation resistance of the studied nanocomposites, the passivation of the materials prior exposure of high-temperature oxidation conditions provides a remarkably improved long-term behavior thereof. Possible mechanisms involved in the oxidation processes of (Hf,Ta)C/SiC and (Hf,Ti)/SiC ceramic nanocomposites are highlighted and critically assessed.
合写作者：Ralf Riedel
第一作者：Qingbo Wen
论文类型：期刊论文
通讯作者：Emanuel Ionescu
论文编号：1800879
文献类型：J
卷号：21
期号：5
是否译文：否
发表时间：2019-05-01
收录刊物：SCI
发布期刊链接：https://onlinelibrary.wiley.com/doi/abs/10.1002/adem.201800879