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New route for processing of multilayer Al2O3-Co3O4 materials through gelcasting |
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| Affiliation: | 1. Institut für Struktur- und Funktionskeramik, Montanuniversität Leoben, Leoben, Austria;2. Materials Center Leoben Forschung GmbH, Leoben, Austria;1. Robert Bosch GmbH, Automotive Electronics, Tübinger-Str. 123, 72762 Reutlingen, Germany;2. Robert Bosch GmbH, Corporate Sector Research and Advanced Engineering, 70465 Stuttgart, Germany;3. German Aerospace Center (DLR), Institute of Materials Research, Linder Höhe, 51147 Cologne, Germany;1. Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA;2. Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706, USA;3. Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA;4. Department of Mechanical Engineering, Clemson University, Clemson, SC 29634, USA;1. Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources, Yuseong–gu, Daejeon, 305–350, South Korea;2. Korea University of Science and Technology, Gajeong–ro, Yuseong–gu, Daejeon 305–350, South Korea |
| Abstract: | Multilayer dense ceramic materials composed of Al2O3 and Al2O3-Co3O4 layers have been obtained by gelcasting. The key stage in the process was the optimization of the polymerization idle time in order to ensure strong adhesion between layers without cracks and delamination in a green state and after sintering. The significant advantage of this method is occurence of strong connections between consituent layers due to the slight migration of the slurry to the gelled bottom part of the sample, what is not obseved in techniques based on lamination processes. The multilayer samples were composed of two Al2O3 layers and two Al2O3-Co3O4 layers arranged alternately. The rheological characterization of the slurries was done. The properties of the sintered multilayer bodies were examined in comparison to the single-layer alumina samples. Observations in SEM and ligth miscroscope were performed. The presence of the transition layer in the sintered bodies was observed. |
| Keywords: | Multilayer ceramics Polymerization Gelcasting Alumina Rheology |
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