| Summary: | 碩士 === 國立成功大學 === 資源工程學系碩博士班 === 95 === Doping TiO2 into alumina can promote its sintering shrinkage and grain growth; while, another dopant-MgO can inhibit grain growth and enhance the final sintered density. In this study, we investigate the sintering and grain growth behavior of pure alumina codoped with TiO2 (0.4, 1wt%) and MgO (0.05, 0.2, 0.4 wt%) base on their individual specific functions.
The results show that alumina doped only with TiO2 can be densified easily, and when the doping quality was raised from 0.4 to 1 wt%, the densification rate increases simultaneously. When the TiO2 doping quantity was fixed at 1 wt% and codoped with MgO from 0.05 to 0.4 wt% gradually, the effect on grain growth inhibition is obvious compare with TiO2 single doping. In this TiO2 and MgO co-doping system, the grain size of sintered bulk is between TiO2 single doped alumina and pure alumina. Otherwise, the specimens can be sintered easily than pure alumina yet. Hence, we can get fine grain densified alumina specimens easily in lower temperature.
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