Rb β-alumina as an interface coating in oxide CMCs

S. Sambasivan, J. A. Morris, William Petuskey

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Scopus citations

Abstract

Rubidium stabilized α-alumina was selected as a potential interface coating material for high temperature ceramic matrix composites. The coatings were developed by MOCVD on sapphire monofilaments which were then hot pressed in an alumina matrix for testing of coating's thermal, chemical, and morphological stability and interfacial properties. While earlier studies have shown Rb β-alumina to be stable up to 1600 °C, this study showed loss of rubidia from surface of bulk specimens above 1200 °C. The coating appears to be chemically stable and compatible with alumina in the hot pressed specimen. Indentation tests performed on the hot pressed specimens show crack deflection at the fiber-matrix interface whereas push out tests showed no debonding of the fiber from the matrix.

Original languageEnglish (US)
Title of host publicationCeramic Engineering and Science Proceedings
EditorsV. Greenhut
PublisherAmerican Ceramic Soc
Pages250-257
Number of pages8
Volume17
Edition4
StatePublished - 1996
Externally publishedYes
EventProceedings of the 1996 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B - Cocoa Beach, FL, USA
Duration: Jan 7 1996Jan 11 1996

Other

OtherProceedings of the 1996 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B
CityCocoa Beach, FL, USA
Period1/7/961/11/96

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ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Sambasivan, S., Morris, J. A., & Petuskey, W. (1996). Rb β-alumina as an interface coating in oxide CMCs. In V. Greenhut (Ed.), Ceramic Engineering and Science Proceedings (4 ed., Vol. 17, pp. 250-257). American Ceramic Soc.