A Layered Alumina Composite Tested at High Temperature in Air

An oxidation‐resistant interphase for layered alumina composites was prepared by aerosol spray deposition of submicrometer alumina powder. A model composite specimen was made by placing the interphase between thin layers of monolithic alumina. The composite sandwich was hot‐pressed to control the in...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2000-12, Vol.83 (12), p.3033-3040
Main Authors: O'Brien, Michael J., Capaldi, Franco M., Sheldon, Brian W.
Format: Article
Language:English
Subjects:
alumina
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
composites
Exact sciences and technology
high temperature
Miscellaneous
Technical ceramics
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Summary:An oxidation‐resistant interphase for layered alumina composites was prepared by aerosol spray deposition of submicrometer alumina powder. A model composite specimen was made by placing the interphase between thin layers of monolithic alumina. The composite sandwich was hot‐pressed to control the interphase fracture resistance for successful crack deflection. Specimens were tested under four‐point bending in air at two crosshead speeds at ambient temperature, 1000°C, and 1200°C. The fracture behavior was temperature dependent, with a higher work of fracture at higher temperatures. Interphase delamination and composite toughening behavior were very pronounced at all temperatures. At the highest temperature, the transition to multiple widely distributed cracks and increased crack deflection may be related to inelastic deformation in the alumina.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2000.tb01679.x