Thermodynamic assessments of ZrO2-YO1.5-TiO2 system

Abstract

The ZrO2–TiO2 and ZrO2-YO1.5 binary systems have been reassessed based on the latest literature information, then the thermodynamic parameters of the two systems combine with that of the YO1.5-TiO2 system have been used to extrapolate the thermodynamic database of ZrO2-YO1.5-TiO2 ternary system. Based on the available experimental information, the ternary interaction parameters of liquid, F (fluorite), and P (pyrochlore) phases are introduced to fix this ternary system. Especially, the calculated solid solubility limit of Tss (tetragonal) and F phases are first considered in this work, which are consistent with the reported experiments. Finally, the isothermal sections calculated at 1573 K, 1773 K, 1823K 1873K and 1923K (1300 °C, 1500 °C, 1550 °C, 1600 °C and 1650 °C) are plotted, which are more consistent with the experimental results than other calculations.