Abstract

ZrO2 alloying effect is applied in fluorite-type Eu3TaO7 ceramics to decrease thermal conductivity and improve thermal expansion performance. The thermal conduction mechanism of Eu3TaO7 ceramics can be adjusted by ZrO2 alloying effect and the lowest thermal conductivity reaches 1.37 W·m−1·K−1 at 900 °C. The Young's modulus of x mol% ZrO2-Eu3TaO7 ceramics decreases with the increasing ZrO2 content, as ZrO2 alloying effect can weaken the bonding strength of Eu3TaO7 and then increase the thermal expansion coefficients (10.7 × 10−6 K−1, 1200 °C). Due to the excellent thermophysical properties, ZrO2-Eu3TaO7 ceramics exhibit great potentiality as high-temperature thermal insulation materials.

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