Sintered zirconium mullite brick is a special refractory product made of industrial alumina and zircon concentrate as raw materials, and zirconia is introduced into Mullite Matrix through reaction sintering process. The results show that when the content of zirconia is 23-24%, the microstructure of the product is mainly a network structure composed of columnar mullite, and the high temperature flexural strength reaches the maximum at 1400 ℃. In the sintering process of the product, because the reaction and sintering are carried out at the same time, the process control process is relatively difficult. Usually, the temperature is kept at 1450 ℃ to densify it, and the reaction is carried out when the temperature rises to 1600 ℃. Zircon is decomposed into ZrO2 and SiO2 at more than 1535 ℃, and SiO2 and Al2O3 react to form mullite. Due to the decomposition of zircon, a liquid phase is produced, and the particles are refined to increase the surface area, thus promoting the sintering. The addition of zirconia accelerates the densification and sintering process of the product due to the generation of low melting point substances and the formation of vacancies. When the content of ZrO2 is 30% and the sintering temperature is 1530 ℃, the strength of the product reaches 378mpa and the toughness reaches 4.3mpa. Therefore, the phase transformation toughening performance of zirconia greatly improves the high-temperature mechanical properties, corrosion resistance and heat shock resistance of mullite products
The products are used in the key parts of industrial furnaces such as glass furnace, glass fiber furnace, steel-making furnace, etc
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