Phase evolution in silicon carbide-whisker-reinforced mullite/zirconia composite during long-term oxidation at 1000° to 1350°C

Chien-Cheng Lin, Avigdor Zangvil, Ruh Robert

研究成果: Article同行評審

10 引文 斯高帕斯(Scopus)

摘要

A composite consisting of 30 wt% SiC whiskers and a mullite-based matrix (mullite-32.4 wt% ZrO2-2.2 wt% MgO) was isothermally exposed in air at 1000°-1350°C, for up to 1000 h. Microstructural evolution in the oxidized samples was investigated using X-ray diffractometry and analytical transmission electron microscopy. Amorphous SiO2, formed through the oxidation of SiC whiskers, was devitrified into cristobalite at T ≥ 1200°C and into quartz at 1000°C. At T ≥ 1200°C, the reaction between ZrO2 and SiO2 resulted in zircon, and prismatic secondary mullite grains were formed via a solution-reprecipitation mechanism in severely oxidized regions. Ternary compounds, such as sapphirine and cordierite, also were found after long-term exposure at T ≥ 1200°C.

原文English
頁(從 - 到)1797-1803
頁數7
期刊Journal of the American Ceramic Society
83
發行號7
DOIs
出版狀態Published - 1 七月 2000

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