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Effect of AlN Substitutions on the Oxidation Behavior of ZrB2-SiC Composites at 1600°C.
- Source :
- Journal of the American Ceramic Society; Oct2016, Vol. 99 Issue 10, p3389-3397, 9p, 4 Black and White Photographs, 3 Diagrams, 2 Charts, 3 Graphs
- Publication Year :
- 2016
-
Abstract
- The oxidation behavior of ZrB<subscript>2</subscript>-SiC composites, with varying amounts of AlN substituting for ZrB<subscript>2</subscript>, was studied isothermally under static ambient air at 1600°C for up to 5 h. Small amounts of AlN substitutions (≤10 vol%) were found to result in marginal improvement in the oxidation resistance, whereas larger amounts resulted in a significant deterioration. The size of ZrO<subscript>2</subscript> clusters formed on the oxidized surface was found to be a function of the AlN content. This effect was more pronounced after longer oxidation times (~1 h) as opposed to shorter durations (~5 min). It was postulated that presence of AlN results in the formation of Al<subscript>2</subscript>O<subscript>3</subscript> during the oxidation process, subsequently resulting in a lowering of viscosity of the glassy silica scale, which facilitates the coarsening of ZrO<subscript>2</subscript> clusters. This also increases oxygen permeation through the scale which adversely affects the oxidation resistance of the high AlN content composites. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00027820
- Volume :
- 99
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 119050693
- Full Text :
- https://doi.org/10.1111/jace.14345