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 properties, including high corrosion resistance, high temperatures resistance, high hardness and strength, wear resistance as well as oxidation resistance. 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.

Method for preparation of spherical aluminum

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 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 by atomization. Then, spherical Alumina powder is formed through high-temperaturepyrolysis. This method is very energy-intensive and requires temperatures of 900 degrees Celsius.

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 is less energy-intensive than the spray pyrolysis method.

3. Jet melting method

Plasma flame is used to melt solid aluminum powder and aluminum oxide powder. Then, annealing treatment is 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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