Characteristics and Main Preparation Methods of Spherical Alumina

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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 characteristics, including high resistance to corrosion and wear resistance, high hardness, high toughness, high strength as well as high resistance against oxidation. It is widely used 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 international markets. It is important to explore new ways to prepare ultrafine spherical Alumina powder.

Method for preparation of spherical aluminum

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 produce aluminasol. Next, spray-drying the sol at 150-240degC will create spherical alu powder.

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 or solid aluminum powder using jet melting. Then, annealing treatment can be performed 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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