THERMAL SHOCK-RESISTANT AND CORROSION-RESISTANT CERAMIC MATERIAL BASED ON CALCIUM ZIRCONATE AND PROCESS FOR THE PRODUCTION THEREOF

摘要

The invention relates to a thermal shock-resistant and corrosion-resistant ceramic material based on calcium zirconate and a process for producing the material. Shaped or unshaped products for energy technology, metallurgy, the automobile industry, the glass and cement industry and the chemical industry can be produced from the ceramic material. The invention addresses the technical problem of developing a thermal shock-resistant and corrosion-resistant ceramic material from which large-volume solid and hollow components can be produced. To ensure a high chemical resistance, the ceramic binder matrix in the composition should largely correspond to the composition of the material. According to the invention, the macrostructure of the material consists of presynthesized calcium zirconate-containing crushed material having an ZrO2/CaO ratio in the range from 1.6:1 to 1:1.5 and a particle size of from 150 µm to 6 mm in a proportion of greater than 50 % by mass and a binder matrix which is composed of fine-grained calcium zirconate and/or zirconium oxide having grain sizes in the range from 50 nm to 150 µm and has been sintered at > 1400°C and surrounds the crushed material.