標題: Effect of zirconia content on the oxidation behavior of silicon carbide/zirconia/mullite composites
作者: Tsai, CY
Lin, CC
Zangvil, A
Li, AK
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 1-九月-1998
摘要: The oxidation of hot-pressed SiC-particle (SiCp)/zirconia (ZrO2)/mullite composites with various ZrO2 contents, exposed in air isothermally at 1000 degrees and 1200 degrees C for up to 500 h, was investigated; an emphasis was placed on the effects of the ZrO2 content on the oxidation behavior. A clear critical volume fraction of ZrO2 existed for exposures at either 1000 degrees or 1200 degrees C: the oxidation rate increased dramatically at ZrO2 contents of >20 vol%. The sharp transition in the oxidation rate due to the variation of ZrO2 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 ZrO2 contents greater than the critical value showed a large oxidation zone, whereas the composites with ZrO2 contents less than the critical value revealed a much-thinner oxidation zone. The results also indicated that the formation of zircon (ZrSiO4) at 1200 degrees C, through the reaction between ZrO2 and the oxide product, could reduce the oxidation rate of the composite.
URI: http://hdl.handle.net/11536/32425
ISSN: 0002-7820
期刊: JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume: 81
Issue: 9
起始頁: 2413
結束頁: 2420
顯示於類別:期刊論文


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