Abstract
AbstractThe thermodynamic database for the ZrO2– La2O3– Y2O3– Al2O3system has been derived using previous descriptions for the six binary systems and the ternary ZrO2– La2O3– Al2O3system. The parameters of the Y2O3– Al2O3system were adjusted due to changes in the Y2O3thermody-namic parameters. The thermodynamic parameters of the La2O3– Y2O3system were slightly changed to get consistency between calculations and new experimental results for the ZrO2– La2O3– Y2O3ternary system. Diverse kinds of phase diagrams of the ZrO2– La2O3– Y2O3and La2O3– Y2O3– Al2O3ternary systems have been calculated. The present thermodynamic description of the quaternary system is consistent with available experimental results for lower-order systems. It was used to calculate isoplethal sections for compositions related to thermal barrier coating (TBC) and its interaction with thermally grown oxide Al2O3. TheT0-lines have been calculated for diffusionless transformations between fluorite, tetragonal, monoclinic and pyrochlore phases in the ZrO2– LaO1.5system as well as driving forces for partitioning of non-equilibrium phase into equilibrium phase assemblages. These data could be applied for determination of desirable ranges of material composition for TBC.
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