Characteristics of CaZrO3 material prepared by in situ decomposition pore forming technology

Authors：Wang, Fangzhou; Wei, Yaowu^*; Wei, Jiawei; Li, Bingrong; Xiao, Junli; Chen, Junfeng; Li, Nan

Source：International Journal of Applied Ceramic Technology, 2022, 19(4): 2073-2082.

DOI：10.1111/ijac.14039

• CaZrO3
• microstructure
• preheat
• thermal conductivity

CaZrO3 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 CaZrO3 samples was detected by X-ray diffraction, and the microscopic morphology of CaZrO3 was observed by scanning electron microscope combined with energy dispersive spectrometer for microzone composition analysis. The results showed that a satisfied CaZrO3 sample could be obtained by in situ decomposition pore forming technology with calcium/zirconium molar ratio of 1:1.02. The CaZrO3 grains were developed better when the samples were preheated at 200 degrees C first and then heated at 1600 degrees C for 3 h. The apparent porosity of CaZrO3 samples were increased to 28.5%, and the thermal conductivity reduced to 1.219 W/(m center dot K) compared with the heavy CaZrO3 samples, which could be used as CaZrO3 refractory aggregates with the lower thermal conductivity.