Kinetic and Thermodynamic Patterns of CaZrO3 Formation at Sintering Zirconium Dioxide with Calcium Carbonate

摘要

Experimental data were obtained on the kinetics of formation of calcium zirconate in the system of ZrO2-CaCO3 with a 1:1 molar ratio of the components at 1000, 1100, 1200, and 1300°C. The thermodynamic characteristics of reactions occurring during sintering zirconium dioxide and calcium carbonate were calculated. The changes in specific surface area of zirconium dioxide at heating and its effect on the kinetics of the studied process were investigated. Analysis of experimental data on the degree of CaZrO3 formation was performed using the fundamental equations of the kinetics of solid-state reactions. The best agreement between the calculation and the experiment was obtained for Jander and Zhuravlev-Lesokhin-Tempelman diffusion models.