Effect of zirconia content on the oxidation behavior of silicon carbide/zirconia/mullite composites

Cheng Yuan Tsai, Chien-Cheng Lin*, Avigdor Zangvil, Ai Kang Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The oxidation of hot-pressed SiC-particle (SiC p)/zirconia (ZrO 2)/mullite composites with various ZrO 2 contents, exposed in air isothermally at 1000° and 1200°C for up to 500 h, was investigated; an emphasis was placed on the effects of the ZrO 2 content on the oxidation behavior. A clear critical volume fraction of ZrO 2 existed for exposures at either 1000° or 1200°C: the oxidation rate increased dramatically at ZrO 2 contents of >20 vol%. The sharp transition in the oxidation rate due to the variation of ZrO 2 content could be explained by the percolation theory, when applied to the oxygen diffusivity in a randomly distributed two-phase medium. Morphologically, the composites with ZrO 2 contents greater than the critical value showed a large oxidation zone, whereas the composites with ZrO 2 contents less than the critical value revealed a much-thinner oxidation zone. The results also indicated that the formation of zircon (ZrSiO 4) at 1200°C, through the reaction between ZrO 2 and the oxide product, could reduce the oxidation rate of the composite.

Original languageEnglish
Pages (from-to)2413-2420
Number of pages8
JournalJournal of the American Ceramic Society
Volume81
Issue number9
DOIs
StatePublished - 1 Sep 1998

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