Alumina hollow spheres and their products are lightweight refractories known for their excellent high-temperature performance and energy-saving capabilities. They remain highly stable in various atmospheric conditions, making them ideal for use in high-temperature kilns operating at up to 1800°C. These hollow spheres serve as effective insulation fillers for high and ultra-high temperature applications, as well as lightweight aggregates in refractory concrete and castables. Hollow ball bricks are particularly useful in energy-efficient systems such as downdraft kilns, shuttle kilns, molybdenum wire furnaces, tungsten rod furnaces, induction furnaces, nitriding furnaces, and more. Their use can significantly reduce furnace weight, improve structural design, cut material usage, and save energy by over 30%.
The Haoyang alumina hollow ball brick [1] is manufactured using a combination of alumina hollow spheres, corundum powder, and calcined materials. The mixture is homogenized, shaped, and then sintered at high temperatures to produce a durable and reliable product.
This product offers remarkable properties, including high-temperature resistance, excellent resistance to acid and alkali corrosion, low thermal conductivity, superior insulation performance, and a low bulk density. It is widely used as working lining and insulation material in high-temperature kilns across industries such as ceramics, electric porcelain, grinding wheels, and refractory materials.
Alumina hollow spheres represent a new generation of high-temperature insulation materials. They are produced by melting industrial-grade aluminum oxide in an electric furnace, resulting in a structure composed of a-Al2O3 microcrystals. These spheres can be molded into various shapes and are capable of withstanding temperatures up to 1800°C. The mechanical strength of the product is several times higher than that of conventional lightweight materials, while its bulk density is only half that of corundum-based products.
These advanced materials have been extensively applied in high- and ultra-high-temperature environments such as petrochemical gasifiers, carbon black reactors, and metallurgical induction furnaces, delivering outstanding energy-saving results and proving to be a valuable solution for modern industrial heating systems.
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