{beta}-SiAlON-silicon nitride multilayered composites
- Fine Ceramics Research Association, Nagoya (Japan). Synergy Ceramics Lab.
- National Industrial Research Inst. of Nagoya (Japan)
Layered composites with alternating {beta}-SiAlON and silicon nitride layers were fabricated using a tape-casting and laminating technique. A distinct layered structure was obtained by hot pressing, where compositions of yttrium and aluminum at the layer interface were functionally graded in a thickness of {approximately} 10 {micro}m. A solid-solution reaction prior to densification in the {beta}-SiAlON layer contributed to the coexistence, in equilibrium, of these two layers. Density and Young`s modulus depended on the volume fraction of silicon nitride layers according to the rule of mixtures. The strength of the {beta}-SiAlON layer, estimated by an equivalent strain model, increased when compared to that of the monolithic material, although the fracture origin always was observed within the {beta}-SiAlON layer. The layer thickness in an alternating layered configuration affected the strength of discrete layers.
- OSTI ID:
- 549931
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 10 Vol. 80; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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