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What is spherical-alumina?
The high-temperature melting spraying method produces spheres of alumina that have high sphericity. Also, it has high levels of a phase alumina. It can be used to fill rubber, plastics, or ceramic raw materials.
Ultrafine spherical aluminum has many excellent properties, including high resistance to corrosion and wear resistance, high hardness, high strength. It is widely used in metallurgy as well as electronics, national defense and aerospace, nuclear industry, and other areas. High-tech field. Presently, there is a rising annual rate of demand for ultrafine spherical allumina on both domestic and foreign markets. It is important to explore new methods of making ultrafine powdered spherical aluminum alumina.
Preparation of spherical-alumina
The spray method is used to prepare spherical aluminum. It achieves phase transition in a very short time. To make the product spherical is achieved by using the surface tension. The phase transition can be classified according to its characteristics into spray pyrolysis and spray drying or spray melting. Law.
1. Spray pyrolysis
Spray pyrolysis uses Al(SO4)3, Al[NO3]3 and AlCl3 to make spherical droplets via atomization. Then, spherical powders of alumina are formed through high-temperaturepyrolysis. This method is very energy-intensive and requires temperatures of 900°C.
2. Spray drying
Spray drying is a method that reacts aluminum salt solution and ammonia water to create alumina sol. Next, spray-dry the alumina sol at 150 to 240°C to make spherical powder.
This method has the advantage over spray pyrolysis in terms of energy consumption.
3. Jet melting method
Plasma flame is used to melt solid aluminum powder or aluminum dioxide powder. Then, the plasma flame is used to anneal the product. Adjusting the DC arc’s power and composition can control the level of spheroidization. This will allow you to create a hollow structure.
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