Effects of sintering on the mechanical and ionic properties of ceria-doped scandia stabilized zirconia ceramic |
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| Affiliation: | 1. Centre of Advanced Manufacturing & Material Processing (AMMP), Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Department of Materials Engineering, Faculty of Engineering & Built Environment, Tunku Abdul Rahman University College, 53300 Kuala Lumpur, Malaysia;3. Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;4. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;5. Centre for Ionics University of Malaya, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;6. Division of Neurosurgery, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia;1. Department of Advanced Material Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju, Chungbuk 28644, Republic of Korea;2. Energy Materials and Convergence Research Department, Korea Institute of Energy Research, 152 Gajeong-ro, Daejeon 305-343, Republic of Korea;3. Platform Technology Laboratory, Samsung Electronics,130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea;1. Universidad Industrial de Santander, INTERFASE, Bucaramanga, Colombia;2. Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181, UCCS – Unité de Catalyse et Chimie du Solide, F-59000, Lille, France;3. Laboratoire Léon Brillouin, UMR 12, CEA-CNRS, Bât. 563 CEA Saclay, 91191, Gif sur Yvette Cedex, France;1. Hexis Ltd., Zum Park 5, 8404 Winterthur, Switzerland;2. Institut für Struktur- und Funktionskeramik, Montanuniversität Leoben, Peter-Tunner-Str. 5, 8700 Leoben, Austria;3. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, Ueberlandstr. 129, 8600 Duebendorf, Switzerland |
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| Abstract: | The effect of conventional sintering from 1300 to 1550 °C on the properties of 1 mol% ceria-doped scandia stabilized zirconia was investigated. In addition, the influence of rapid sintering via microwave technique at low temperature regimes of 1300 °C and 1350 °C for 15 min on the properties of this zirconia was evaluated. It was found that both sintering methods yielded highly dense samples with minimum relative density of 97.5%. Phase analysis by X-ray diffraction revealed the presences of only cubic phase in all sintered samples. All sintered pellets possessed high Vickers hardness (13–14.6 GPa) and fracture toughness (~3 MPam1/2). Microstructural examination by using the scanning electron microscope revealed that the grain size varied from 2.9 to 9.8 µm for the conventional-sintered samples. In comparison, the grain size of the microwave-sintered zirconia was maintained below 2 µm. Electrochemical Impedance Spectroscopy study showed that both the bulk and grain boundary resistivity of the zirconia decreases with increasing test temperature regardless of sintering methods. However, the grain boundary resistivity of the microwave-sintered samples was higher than the conventional-sintered ceramic at 600 °C and reduced significantly at 800 °C thus resulting in the enhancement of electrical conduction. |
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| Keywords: | Scandia stabilized zirconia Microwave sintering Ionic conductivity Mechanical property |
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