Kim, Chang Soo Lombardo, Stephen J. Winholtz, Robert A. 2024-01-21T02:33:32Z 2024-01-21T02:33:32Z 2021-08-31 2006-09 0002-7820 https://pubs.kist.re.kr/handle/201004/135222 A method is described whereby thin ceramic shapes are induced to adopt a different shape at elevated temperature without the application of an external pressure. To achieve deformation, thin beams of alumina are coated with magnesia; at a high temperature, the strain mismatch that arises in the sample leads to deformation. Scanning electron microscopy and compositional profiling suggest that a bilayer structure forms. One layer contains both Mg and Al cations and the spinel phase is present, whereas the second layer consists predominantly of alumina. A mechanics model based on strain mismatch in bilayer systems indicates how the resulting curvature depends on the thickness of the two regions. A mechanistic model is derived that describes the strain mismatch in terms of the degree of conversion to spinel, the amount of differential sintering between layers, and the amount of residual porosity present in the two layers of the substrate. English BLACKWELL PUBLISHING CONSTRAINED DENSIFICATION EXTERNAL-PRESSURE SYSTEM MGO-AL2O3 SOLID-STATE THIN-FILMS SPINEL DEFORMATION ACTUATORS CURVATURE CERAMICS Effect of processing on the microstructure and induced-strain mismatch in magnesia-alumina-layered composites Article 10.1111/j.1551-2916.2006.01131.x 1 JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.89, no.9, pp.2718 - 2725 JOURNAL OF THE AMERICAN CERAMIC SOCIETY 89 9 2718 2725 scie scopus 000239863100006 Materials Science, Ceramics Materials Science Article CONSTRAINED DENSIFICATION EXTERNAL-PRESSURE SYSTEM MGO-AL2O3 SOLID-STATE THIN-FILMS SPINEL DEFORMATION ACTUATORS CURVATURE CERAMICS