Modes of oxidation in SiC-reinforced mullite/ZrO 2 composites: oxidation vs depth behavior

Chien-Cheng Lin*, A. Zangvil, R. Ruh

*此作品的通信作者

研究成果: Article同行評審

8 引文 斯高帕斯(Scopus)

摘要

Two basic oxidation modes of composites with oxidizing particles in a non-oxidizing matrix have been observed. Mode 1 is defined as the complete oxidation of all the particles within an outer layer of the composite, while mode II exhibits partial oxidation of the particles, deep into the composite. Using microscopic observations to plot the silica layer thickness on particles (whiskers) vs the depth of the particles (whiskers) below the composite surface is proposed as a powerful means of categorizing and quantifying actual oxidation modes. Thus, mullite/SiC-whisker composites were found to have mode I oxidation behavior, while certain (mullite + ZrO 2 )/SiC-whisker composites were found to exhibit mode II behavior, followed by a mixed mode after severe exposures. It is proposed that mode II behavior appears when oxygen diffusivity in the matrix is much higher than that in the product oxide layer.

原文English
頁(從 - 到)1977-1986
頁數10
期刊Acta Materialia
47
發行號6
DOIs
出版狀態Published - 23 四月 1999

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