What Are Alumina Bubble Bricks

 With the advancements in technology and science, new kinds of hollow materials that were crafted from carbon, ceramic and glass are used widely in various science industries. The refractory products which have been constructed out of a hollow sphere represent better high-temperature resistance, high strength, great thermal-shock resistance, and outstanding insulation properties.

Because these material types have lower thermal capacities as well as a lower bulk density they are able to increase thermal efficiencies from the high-temperature furnaces, drastically lower the overall weight of the furnace as well as decrease production cycles. This material is commonly used in the lining of those high-temperature furnaces.

The Alumina bubble bricks (https://refractoriesmaterials.com/alumina-bubble-brick/) are usable with a temperature of 1800℃ for long amounts of time. At these higher temperatures they maintain good corrosion resistance and chemical stability. Also, they are capable of remain stable in hydrogen atmospheres.

The Alumina raw materials will first be melted inside an electrical-arc furnace in a temperature of 2200℃. When the melted material flows out they can be blown using high-pressure air which then causes the melted substance to disperse into tiny droplets. During the cooling stages, these droplets form into hollow alumina balls caused by negative effects of surface tension.

These hollow balls undergo a screening to be able to remove particles, big fragments and fine powder. Any iron is going to be removed employing a magnetic iron. Any broken balls will also be removed if you use a “ball selecting” machine. These hollow alumina spheres are then packed as a completed product.

The Alumina bubble brick is manufactured by Rongsheng Company using a mixture of 30% sintered Alumina powder, 70% Alumina hollow spheres which are bonded using aluminium sulphate. The bricks are molded with the aid of vibration molding inside wooden molds with the use of pressure. Once dried, the green-body will be either light burned or sintered employing a high temperature into bricks.