Corundum castable and corundum-mullite castable are both high-end monolithic refractory materials. Relying on their unique compositional advantages, they play an irreplaceable role in high-temperature environments.
Among them, corundum castable is prepared with alumina (Al₂O₃) such as white corundum and brown corundum as the main aggregates and powders. It features high strength, excellent wear resistance, and outstanding chemical erosion resistance. It is widely used in medium and high-temperature applications such as boiler linings, heating furnaces, and carbon black reaction furnaces, providing basic protection for the stable operation of equipment.
Compared with corundum castables, corundum-mullite castables incorporate mullite (Al₂O₃·SiO₂) into the corundum matrix, forming a composite material with more comprehensive properties. This combines the high wear resistance of corundum and the excellent thermal shock resistance of mullite.
The material exhibits outstanding high-temperature resistance, with a refractoriness above 1800°C. It also features strong thermal shock resistance, a high softening temperature under load, and low high-temperature creep rate, enabling it to withstand complex working conditions involving high temperature, high stress, and high abrasion. It is widely used in key parts such as waste incinerators, gasifiers, cement rotary kiln outlets, and coal injection pipes.
According to industry data, equipment lined with corundum-mullite castables can achieve a service life extension of more than 60% compared with traditional materials, greatly reducing downtime, maintenance frequency and costs.
For a long time, traditional castables have faced the pain point that it is difficult to balance wear resistance, thermal shock resistance and construction performance, which has restricted the efficiency improvement of high-temperature industries. In recent years, domestic refractory enterprises have increased R&D investment, and promoted technological breakthroughs in two types of castables through formula optimization and process upgrading.
Industry experts stated that the technological upgrading of corundum and corundum-mullite castables aligns with the development trend of energy conservation, carbon reduction, quality improvement and efficiency enhancement in high-temperature industries. In the future, with the deepening of industry-university-research cooperation, enterprises will further focus on the development directions of greenization, high-performance and intellectualization, launch new products such as low-cement and self-flowing types, optimize construction techniques, reduce material loss and energy consumption, and expand application scenarios in emerging fields including new energy and high-end manufacturing, so as to inject new impetus into the green and efficient development of high-temperature industries.
