Dependence of oxidation modes on zirconia content in silicon carbide/zirconia/mullite composites

Cheng Yuan Tsai, Chien-Cheng Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Two basic oxidation modes of silicon carbide/zirconia/ mullite (SiC/ZrO2/mullite) composites were defined based on the plotted curve of the gradient of the silica (SiO2) layer thickness (formed on individual SiC particles) versus depth. Mode I, where oxygen diffusivity was much slower in the matrix than in the SiO2 layer, exhibited a relatively large gradient and limited oxidation depth. Mode II, where oxygen diffusivity was much faster in the matrix than in the SiO2 layer, displayed a relatively small gradient and an extensive oxidation depth. When the volume fraction of ZrO2 was below a threshold limit, the composites exhibited Mode I behavior; otherwise, Mode II behavior was observed. For composites with a ZrO2 content above the threshold limit, the formation of zircon (ZrSiO4), as a result of the reaction between ZrO2 and the oxidation product (i.e., SiO2), might change the oxidation behavior from Mode II to Mode I.

Original languageEnglish
Pages (from-to)3150-3156
Number of pages7
JournalJournal of the American Ceramic Society
Volume81
Issue number12
DOIs
StatePublished - 1 Jan 1998

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