Sintering behaviour and properties of manganese-doped alumina |
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| Authors: | S.B. Dhuban S. Ramesh C.Y. Tan Y.H. Wong U. Johnson Alengaram S. Ramesh W.D. Teng F. Tarlochan U. Sutharsini |
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| Affiliation: | 1. Center of Advanced Manufacturing and Material Processing, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Centre for Innovative Construction Technology (CICT), Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;3. Centre for Ionics University of Malaya, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;4. Ceramics Technology Group, SIRIM Berhad, Shah Alam 40911, Malaysia;5. Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, Doha, Qatar;6. Department of Physics, University of Jaffna, Jaffna, JA 40000, Sri Lanka |
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| Abstract: | The effect of manganese (0.1, 0.5 and 1.0?wt%) on the sintering and mechanical properties of alumina was studied. Sintering was carried out by the conventional heating method in a box furnace and in a hybrid multimode microwave furnace. XRD analysis revealed the precipitation of a spinel second phase (MnAl2O4) in manganese-doped samples as a result of manganese limited solubility in the corundum lattice. The addition of 0.1?wt% manganese was most beneficial in enhancing the densification of alumina (97.5% relative density when compared to 94.2% for the undoped sample), hindered grain growth, and improved the hardness of the ceramic when sintered at 1500?°C. The study also revealed that microwave sintering was effective in suppressing grain growth of alumina. In addition, the hardness was dependent on the sintered bulk density and that grain coarsening ensued as the density of the sintered alumina exceeded 95% of theoretical. |
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| Keywords: | Alumina Sintering additive Manganese doping Microwave sintering Conventional sintering |
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