Thermo-elastic properties of dense YSZ and porous Ni-ZrO2 monolithic and isotropic materials

Attempts are made to correlate the structure and properties of dense and porous Yittria Stabilized Zirconia to establish optimal thermo-elastic properties for better performance at elevated temperatures. Temperature and compositional dependence of isotropic elastic bulk properties (Young's modulus, Poisson's ratio and Shear and Bulk moduli) are determined using the stiffness constants reported in the literature. Anisotropy of Yittria Stabilized Zirconia increases with composition of Yittria dosage in Zirconia. Optimal composition of 12 mole% Yittria stabilized Zirconia is slightly better than 8 mole% Yittria Stabilized Zirconia based on the improved thermo-elastic properties for better performance at higher temperature (RT400 degrees C). However 15.5 mole% YSZ seems to be more suitable from the view point of thermo-elastic performance at elevated temperatures (500-800 degrees C). Polycrystalline properties predicted are within 5% error limits of the experimental values for Young's modulus of 12 mole% Yittria Stabilized Zirconia. Numerical prediction of Young's modulus of 12 mole% YSZ for (100) orientation is 362 GPa as compared to experimental value of 370 GPa reported in literature. (c) 2006 Springer Science + Business Media, Inc.