Corundum refractory castables are a type of high-performance refractory material that is widely used in various high-temperature industrial furnaces. They are formulated with high-quality corundum as the main raw material, combined with various binders, additives, and fillers to provide high strength, wear resistance, thermal stability, and corrosion resistance.
Corundum refractory castables are classified into different grades based on their aluminum oxide content, bulk density, and cold crushing strength. The most commonly used grades are the low cement castables (LCC) and ultra-low cement castables (ULCC), which have aluminum oxide content above 90% and bulk densities ranging from 2.7-3.0g/cm3.
The technical parameters of corundum refractory castables include compressive strength, thermal conductivity, thermal expansion coefficient, and hot modulus of rupture. These parameters determine the performance and durability of the castable in different applications. They are also influenced by the production process, such as the mixing method, curing time, and sintering temperature.
The production process of corundum refractory castables involves several steps, including raw material preparation, mixing, molding, and sintering. The raw materials are first ground and sieved to the appropriate size. They are then mixed with binding agents and additives using a high-speed mixer or a planetary mixer. The mixture is then poured into molds and compacted using a vibration table. The castables are then cured at ambient temperature or heated gradually to a specific temperature.
Corundum refractory castables have many advantages over other refractory materials, such as high thermal shock resistance, excellent chemical stability, and low porosity. They are widely used in the steel, cement, petrochemical, and power industries, to name a few. With the continuous development of technology, corundum refractory castables will continue to play a crucial role in high-temperature applications.
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