Mechanical behaviour and pore morphology of functionally graded alumina preforms and their composites |
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| Affiliation: | 1. Biomaterials Engineering Group, Bristol Dental School, University of Bristol, Lower Maudlin Street, Bristol BS1 2LY, United Kingdom;2. Bristol Composites Institute, University of Bristol, Bristol BS8 1TR, United Kingdom;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan 430081, China;1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. Fraunhofer IWM, 79108 Freiburg, Germany;3. Institute for Applied Materials, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany;4. Department of Chemistry and 4D LABS, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Sinosteel Louyang Institute of Refractories Research Co. Ltd., Luoyang 471039, China;1. Laboratory of Membrane Processes (LABSEM), Graduate Program of Food Engineering, Department of Chemical and Food Engineering, Federal University of Santa Catarina (UFSC), Trindade, Florianópolis, Santa Catarina 88040-900, Brazil;2. Laboratory of Biological Engineering (LiEB), Graduate Program of Chemical Engineering, Department of Chemical and Food Engineering, Federal University of Santa Catarina (UFSC), Trindade, Florianópolis, Santa Catarina 88040-900, Brazil;1. College of Physics and Information Technology, Shaanxi Normal University, Xi''an 710062, China;2. College of Physics and Information Technology, Shanxi Vocational University of Engineering Science and Technology, Tai''yuan 030000, China |
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| Abstract: | Functionally-graded ceramic composites were produced using a hot pour-and-set method via freeze casting of alumina slurries with solid loading between 40% and 20%, with gelatine as a binder. The slurry and additives were tailored for controlling the microstructure and mechanical properties, such as pore morphology, preform density and compressive strength. Varying the gelatine concentration between 2.5% and 9%, transformed the pore morphology from lamelllar to honeycomb and into closed cell. At 3% concentration, increasing the solid loading from 10% to 30% yielded higher compressive strength from 48 MPa to 317 MPa. The resultant compressive behaviour closely matched to Gibson-Ashby closed cell predictive model. Alumina/epoxy composite mechanical performance plateau as the solid loading increased; the 20% solid loading composite produced the best performance. The compressive strengths of the alumina/epoxy and alumina/aluminium composites were on average 300% and 1110% higher than their respective preform counterparts, across a solid loading range of 10–20%. |
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| Keywords: | Freeze casting Gelatine Functionally graded Composite Alumina |
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