Alumina hollow spheres and their products are advanced lightweight refractory materials known for their exceptional high-temperature performance and energy-saving capabilities. These materials remain highly stable in various atmospheric conditions, making them ideal for use in high-temperature kilns operating at up to 1800°C. The hollow spheres serve as excellent insulation fillers, lightweight aggregates for refractory concrete, and components in high-temperature castables. Alumina hollow ball bricks are particularly effective in reducing energy consumption by over 30% in applications such as downdraft kilns, shuttle kilns, molybdenum wire furnaces, tungsten rod furnaces, induction furnaces, and nitriding furnaces. They significantly reduce furnace weight, improve structural efficiency, and lower material and energy costs.
Haoyang alumina hollow ball bricks [1] are manufactured using a combination of alumina hollow spheres, corundum powder, and calcined powders. This mixture is homogenized, formed, and then sintered at extremely high temperatures to ensure superior quality and performance.
The product exhibits remarkable resistance to high temperatures, acid and alkali corrosion, and offers low thermal conductivity along with excellent thermal insulation properties. It also has a very low bulk density, making it an ideal choice for the working lining and heat insulation layers in high-temperature kilns used in industries such as ceramics, electric porcelain, grinding wheels, and refractory materials.
Alumina hollow spheres represent a cutting-edge high-temperature insulation material. They are produced by melting industrial-grade aluminum oxide in an electric furnace, resulting in a microcrystalline structure of α-Al₂O₃. These spheres can be molded into various shapes and are capable of withstanding temperatures up to 1800°C. Their mechanical strength is several times greater than that of conventional lightweight materials, while their bulk density is only half that of corundum-based products.
These materials have been widely adopted in high- and ultra-high-temperature environments, including petrochemical gasifiers, carbon black reactors, and metallurgical induction furnaces. Their implementation has led to significant energy savings and improved operational efficiency in these demanding applications.
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