Fugitive Interfacial Carbon Coatings for Oxide/Oxide Composites

The effectiveness of fugitive interfacial carbon coatings in Nextel™ 720‐based composites was investigated. Dense (>90%) matrix (calcium aluminosilicate, 0° and ±45°) composites and porous matrix (mullite/alumina, eight‐harness satin fabric) composites were fabricated and tensile tested in two co...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2000-02, Vol.83 (2), p.329-336
Main Authors: Keller, Kristin A., Mah, Tai-Il, Parthasarathy, Triplicane A., Cooke, Charles M.
Format: Article
Language:English
Subjects:
ceramic matrix composites
coatings
interfaces
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Summary:The effectiveness of fugitive interfacial carbon coatings in Nextel™ 720‐based composites was investigated. Dense (>90%) matrix (calcium aluminosilicate, 0° and ±45°) composites and porous matrix (mullite/alumina, eight‐harness satin fabric) composites were fabricated and tensile tested in two control conditions (uncoated or carbon‐coated) and with the carbon removed (fugitive interface). Results indicated that carbon removal in dense matrix composites did not significantly change unidirectional composite strength, even after long‐term exposure at 1000°C. For porous matrix composites, composite strength was independent of the fiber/matrix interface, even after exposure at 1150°C for 500 h in air.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2000.tb01194.x