Abstract
The influence of La2O3 addition on the thermal diffusivity and thermal conductivity of ZrO2 ceramics has been investigated. Porous and dense ZrO2 ceramics were fabricated by spark plasma sintering at 1100 and 1500°C. The porosity of ZrO2 ceramics sintered at 1100°C increased with increasing 0–5 mol % La2O3 addition. In contrast, ZrO2 ceramics sintered at 1500°C showed full density regardless of the amount of La2O3 addition. The La2Zr2O7 of crystalline pyrochlore phase was formed by reaction between La2O3 and ZrO2. The XRD peak of the La2Zr2O7 phase increased with increasing La2O3 addition. The thermal diffusivity and thermal conductivity of sintered ZrO2 decreased with increasing La2O3 addition. In addition, the thermal conductivity of the present samples decreased remarkably with increasing the porosity.
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