Formation of porous aggregations composed of Al2O3 platelets using potassium sulfate flux |
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| Affiliation: | 1. University of Utah Department of Biomedical Engineering, 36 S Wasatch Dr, Salt Lake City, UT 84112, United States;2. Medtronic, 710 Medtronic Parkway, Minneapolis, MN 55432-5604 USA;3. University of Nevada Las Vegas Department of Orthopaedics, University of Nevada, Las Vegas, 4505 S. Maryland Pkwy, Las Vegas, NV 89154;4. University of Utah Department of Orthopaedics, 590 Wakara Way, Salt Lake City, Utah 84108;1. Centre of Advanced Structural Ceramics, Department of Materials, Imperial College London, SW7 2AZ, UK;2. Department of Mechanical Engineering, Imperial College London, SW7 2AZ, UK |
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| Abstract: | Porous aggregations, with about 10 μm diameter, composed of Al2O3 platelet crystals were formed by heating a powder mixture consisting of Al2(SO4)3+2K2SO4 (mol ratio) in an alumina crucible at temperatures 1000–1300°C for 3 h and removing the flux component with hot hydrochloric acid after heating. The specific surface area of the aggregations obtained by heating at 1000°C for 3 h was maximum and its value was 5·2 m2 g?1. Since the size of Al2O3 platelets increased and the number of Al2O3 platelets decreased, the specific surface area decreased to 0·7 m2 g?1 at 1100°C. When heated at 1300°C, the size of the Al2O3 platelets increased with increasing amount of K2SO4 in the starting powder mixture. © |
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