What is spherical-alumina?

The high-temperature melting spraying method produces spheres of alumina that have high sphericity. Also, it has high amounts of a phase alumina. It can be used to fill rubber, plastics, or ceramic raw materials.

Ultrafine spherical aluminum has many excellent characteristics, including high resistance to corrosion and wear resistance, high hardness, high strength. It is used widely in the chemical industry, electronics and national defense. 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 ways to prepare ultrafine spherical Alumina powder.

Preparation of spherical-alumina

The spray method is used to prepare spherical aluminum. It achieves phase transition in a very short time. The product will become spherical by using the surface tension. The phase transition can be classified according to its characteristics into spray drying, spray pyrolysis and spray melting. Law.

1. Spray pyrolysis

Spray pyrolysis uses Al(SO4)3, Al[NO3]3 and AlCl3 to make spherical droplets by atomization. Then, spherical Alumina powder is 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-drying at 150-240°C will dry the alumina sol to produce spherical amounts of alumina.

This method has the advantage over spray pyrolysis in terms of energy consumption.

3. Jet melting method

Plasma flame is used to melt aluminum oxide and solid aluminum powder using jet melting. Then, the plasma flame is used to anneal the powder immediately. 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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