Significant improvement of high-temperature oxidation resistance of HfC/SiC ceramic nanocomposites with the incorporation of a small amount of boron
发布时间：2021-09-03
点击次数：
影响因子：5.3
DOI码：10.1016/j.jeurceramsoc.2020.03.067
发表刊物：Journal of the European Ceramic Society
摘要：Oxidation behavior of boron-containing HfC/SiC nanocomposites (SHBC) at temperatures up to 1500 °C and with exposure time up to 100 h was investigated. Two strategies to improve the oxidation resistance of the HfC/SiC ceramics are proposed. First concept involves the incorporation of a small amount of boron (ca. 0.6 wt.%) into the nanocomposite via a single-source-precursor approach, which contributes significantly to the enhancement of its oxidation resistance. Parabolic oxidation rate constants of 10−3 to 10-4 mg2/(cm4 h) at 1300−1500 °C were measured for SHBC and were several orders of magnitude lower than those recorded for boron-free HfC/SiC. The second improvement concept is realized via passivation of the samples upon short-term oxidation at 1400 °C, providing an excellent oxidation resistance over a wide temperature range. This is a crucial step especially when considering the poor oxidation behavior of HfC and the sluggish formation of protective silica scale at moderate temperatures.
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：40
期号：10
页面范围：3499-3508
是否译文：否
发表时间：2020-08-01
收录刊物：SCI