Hollow Alumina Ball for Fire Brick

Hollow Aluminum Oxide Ball – it is a kind of microparticle with a special structure and material properties. The appearance of hollow aluminum oxide balls is spherical, and the inner part is a hollow structure. It is made of aluminum oxide. It is melted and blown in an electric oven. The maximum operating temperature can reach 1800℃.

Physico-chemical characteristics of a hollow aluminum oxide ball

Subject		Unit	Index
Chemical composition	Al2O3	%	≥99
	Fe2O3	%	≤0.1
	SiO2	%	≤0.2
	Na2O	%	≤0.4
Melting point		°C	2250
Fire resistance		°C	1900
Pore ​​volume		%	≤10
Particle size		mm	0.2-0.5,0.2-1,1-2,2-3,1-3,3-5,0.2-5

Application of high purity alumina balls

Fire bricks, made of hollow balls of clay, divided into standard bricks, ordinary bricks and special bricks. Alumina hollow bead products are mainly used as lining for high temperature industrial furnaces at temperatures below 1800°C. Alumina Hollow Ball Products, such as bricks for the outer lining of high-temperature furnaces in refractory, electronics and ceramics industry; thermal insulation layers for high temperature thermal equipment, such as insulating bricks for gasifiers in the petrochemical industry, gas generators, industrial reactors of soot and induction furnaces of the metallurgical industry.

Application in the above areas can save on 20% to 30% energy. This type of brick is not suitable for use as a lining for high-temperature furnaces. If the temperature rises too quickly during firing, cracks form, and strength and service life are reduced. Due to its high apparent porosity it cannot be used in parts, in contact with slag. Otherwise, it will be damaged due to penetration of molten slag.

Characteristics of Hollow Spherical Bubble Alumina

1. Light weight and high strength: Due to its inner hollow structure, hollow balls of aluminum oxide have low density and excellent strength and rigidity, what makes them light and high -strength materials. Thanks to this, hollow balls from aluminum oxide have broad prospects for use in many areas.
2. Resistance to acids and alkalis: Hollow balls of aluminum oxide have good resistance to acids and alkalis. Since aluminum oxide itself has high chemical stability, Hollow aluminum oxide balls have excellent corrosion resistance in acidic and alkali environments, and can be stably used for a long time in harsh chemical environments.

Heat resistance: Hollow aluminum oxide balls have good heat resistance. Aluminum oxide has a high melting point and good thermal conductivity and can maintain structural stability and strength at high temperatures. Therefore, hollow aluminum oxide balls are widely used in high temperature processes, such as insulating materials for ovens, gas turbines, etc..

Good sound absorption indicators: Since the inside of the hollow sphere from aluminum oxide is a half structure, It has high sound absorption capacity and can effectively reduce the reflection and propagation of sound waves. This makes hollow aluminum oxide beads an ideal sound-absorbing material., widely used in construction, automotive industry, aerospace industry and other fields.

Good thermal insulation properties: Hollow aluminum oxide balls have good thermal insulation properties. Hollow structure may reduce thermal conductivity, due to which hollow aluminum oxide balls have wide application prospects in thermal insulation materials. Especially in the field of construction, hollow alumina beads can effectively reduce the thermal bridge effect and improve the energy efficiency of buildings.

Ease of processing: Hollow alumina balls have good processability. They can be molded and processed by injection molding, hot pressing, etc., and if special requirements are met, it is possible to produce products from hollow alumina spheres of various shapes and sizes.