Characteristics of CaZrO ₃ material prepared by in situ decomposition pore forming technology

Abstract CaZrO ₃ samples were prepared by in situ decomposition pore forming technology in this paper. The influence of calcia/zirconia molar ratio and heating treatment on the microstructure and thermal conductivity of the sintered samples were investigated. The phase analysis of CaZrO ₃ samples was detected by X‐ray diffraction, and the microscopic morphology of CaZrO ₃ was observed by scanning electron microscope combined with energy dispersive spectrometer for microzone composition analysis. The results showed that a satisfied CaZrO ₃ sample could be obtained by in situ decomposition pore forming technology with calcium/zirconium molar ratio of 1:1.02. The CaZrO ₃ grains were developed better when the samples were preheated at 200°C first and then heated at 1600°C for 3 h. The apparent porosity of CaZrO ₃ samples were increased to 28.5%, and the thermal conductivity reduced to 1.219 W/(m·K) compared with the heavy CaZrO ₃ samples, which could be used as CaZrO ₃ refractory aggregates with the lower thermal conductivity.