Effect of manganese oxide on the densification and properties of ceria-doped scandia stabilized zirconia
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In the present work, the effect of manganese oxide (MnO2) additions (0, 0.5, 1 and 5 wt%) on the properties of ceria-dopedscandia stabilized zirconia (10Sc1CeSZ) was investigated over the temperature range of 1400 oC to 1550 oC. The results showedthat the addition up to 1 wt% had negligible effect on the mechanical properties of the ceramic. The samples containing upto 1 wt% MnO2 attained above 97.5% relative density, Vickers hardness of 13-14 GPa and fracture toughness of about3 MPam1/2. In addition, it was revealed that the 0.5 wt% MnO2 addition was beneficial in suppressing the cubic zirconia graingrowth i.e. the highest average grain size was measured at 4.9 µm when sintered at 1550 oC as compared to 9.9 µm measuredfor the undoped zirconia when sintered at the same temperature. On the other hand, the addition of 5 wt% MnO2 was foundto be detrimental to the densification and properties of the zirconia, particularly when sintered at higher temperatures. Thiswas attributed to the accelerated grain growth of the doped samples, i.e. the grain size increased by 2 fold, to 18.6 µm whensintered at 1550 oC.
Abstract
In the present work, the effect of manganese oxide (MnO2) additions (0, 0.5, 1 and 5 wt%) on the properties of ceria-dopedscandia stabilized zirconia (10Sc1CeSZ) was investigated over the temperature range of 1400 oC to 1550 oC. The results showedthat the addition up to 1 wt% had negligible effect on the mechanical properties of the ceramic. The samples containing upto 1 wt% MnO2 attained above 97.5% relative density, Vickers hardness of 13-14 GPa and fracture toughness of about3 MPam1/2. In addition, it was revealed that the 0.5 wt% MnO2 addition was beneficial in suppressing the cubic zirconia graingrowth i.e. the highest average grain size was measured at 4.9 µm when sintered at 1550 oC as compared to 9.9 µm measuredfor the undoped zirconia when sintered at the same temperature. On the other hand, the addition of 5 wt% MnO2 was foundto be detrimental to the densification and properties of the zirconia, particularly when sintered at higher temperatures. Thiswas attributed to the accelerated grain growth of the doped samples, i.e. the grain size increased by 2 fold, to 18.6 µm whensintered at 1550 oC.
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