Thermoshock-resistant ceramic material consisting of Al203 with TiO2 additives

摘要

The invention relates to a thermal shock-resistant refractory material based on Al2O3 with TiO2 additives and the process for its production. The material according to the invention can be used in thermally highly stressed metallurgical and energetic high-temperature systems, such as plants for iron and steel production, non-ferrous metal production, synthesis gas production or as a heat shield in gas turbines, and can increase their service life. The invention is based on the technical problem of developing a method for producing coarse-grained oxide-ceramic refractory materials based on Al2O3. The proportion of binding matrix in the refractory material should be as small as possible and optimally adapted to the matrix material Al2O3. The use of zirconium dioxide should be avoided in the binding matrix. According to the invention, the thermal shock-resistant ceramic material consisting of Al2O3 with TiO2 additives is characterized in that the material contains 95 to 99% by weight Al2O3 and the binding phase of the material consists of aluminum titanate and NaTi2Al5O12 needles. The production process is characterized in that an aluminum oxide raw material with a proportion of at least 95% by weight and less than 99% by weight and a grain size between 0.05 μm and 5000 μm is 0.3 to 1.5% by weight Na2O source and a titanium dioxide powder with a proportion of 1 to 5% by weight and a grain size between 0.05 μm and 50 μm are added, and the moldings are sintered at temperatures above 1500 ° C. Unmodified alumina from the Bayer process, which contains up to 0.6% by weight Na2O, is particularly suitable.