The effect of transition metal oxide doping on the sintering behaviour of yttria-stabilised tetragonal zirconia
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The effect of small amounts (0.2 wt% and 0.5 wt%) of transition metal oxide (CuO) doping on the sintering behavior of 3mol% yttria-stabilized zirconia (Y-TZP) was investigated over the temperature range of 1250 oC to 1500 oC. Sintered sampleswere characterized to determine the phase present, relative density, microstructural evolution and Vickers hardness. Thestudies revealed that the addition of 0.2 wt% CuO dopant was most effective in enhancing the densification of the Y-TZP inparticularly at low temperatures below 1350 oC. The phase analysis revealed that the tetragonal phase was disrupted as evidentfrom the high monoclinic phase formation in the 0.5 wt% CuO-doped zirconia. This phenomenon was associated withmechanism involving transient liquid phase which believed to have destabilized the tetragonal structure. Nevertheless, thestudy revealed that compared to the undoped Y-TZP, the sample with addition of 0.2 wt% CuO resulted in enhanced hardnessand finer grain sizes when sintered at relatively low temperatures.
Abstract
The effect of small amounts (0.2 wt% and 0.5 wt%) of transition metal oxide (CuO) doping on the sintering behavior of 3mol% yttria-stabilized zirconia (Y-TZP) was investigated over the temperature range of 1250 oC to 1500 oC. Sintered sampleswere characterized to determine the phase present, relative density, microstructural evolution and Vickers hardness. Thestudies revealed that the addition of 0.2 wt% CuO dopant was most effective in enhancing the densification of the Y-TZP inparticularly at low temperatures below 1350 oC. The phase analysis revealed that the tetragonal phase was disrupted as evidentfrom the high monoclinic phase formation in the 0.5 wt% CuO-doped zirconia. This phenomenon was associated withmechanism involving transient liquid phase which believed to have destabilized the tetragonal structure. Nevertheless, thestudy revealed that compared to the undoped Y-TZP, the sample with addition of 0.2 wt% CuO resulted in enhanced hardnessand finer grain sizes when sintered at relatively low temperatures.
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