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 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 methods of producing 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 pyrolysis and spray drying or spray melting. Law.
1. Spray pyrolysis
The spray pyrolysis process uses Al(SO4)3, Al[NO3]3 and AlCl3 to make spherical droplets via atomization. After that, spherical powder is formed by 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 create alumina sol. Next, spray-dry the alumina sol at 150 to 240 degrees 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 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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