Microstructure and high-temperature mechanical behavior of alumina/alumina-yttria-stabilized tetragonal zirconia multilayer composites
- Dept. de Fisica de la Materia Condensada, Sevilla (Spain)
- CSIC, Madrid (Spain). Inst. de Ciencias de Materiales
Layered composites of alternate layers of pure Al{sub 2}O{sub 3} (thickness of 125 {micro}m) and 85 vol% Al{sub 2}O{sub 3}-15 vol% ZrO{sub 2} that was stabilized with 3 mol% Y{sub 2}O{sub 3} (thickness of 400 {micro}m) were obtained by sequential slip casting and then fired at either 1,550 or 1,700 C. Constant-strain-rate tests were conducted on these materials in air at 1,400 C at an initial strain rate of 2 {times} 10{sup {minus}5} s{sup {minus}1}. The load axis was applied both parallel and perpendicular to the layer interfaces. Catastrophic failure occurred for the composite that was fired at 1,700 C, because of the coalescence of cavities that had developed in grain boundaries of the Al{sub 2}O{sub 3} layers. In comparison, the composite that was fired at 1,550 C demonstrated the ductility of the Al{sub 2}O{sub 3} + YTZP layer, but at a flow stress level that was determined by the Al{sub 2}O{sub 3} layer.
- Sponsoring Organization:
- Comision Interministerial de Ciencia y Tecnologia (Spain)
- OSTI ID:
- 532944
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 8 Vol. 80; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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