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What is spherical-alumina?
The high-temperature melting spraying method produces spherical alumina. This has the characteristics high sphericity, high content of a phase alumina and high purity. 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 used widely 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 producing 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. 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 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
The spray drying process involves reacting aluminum salt solution and ammonia water to make aluminasol. Next, spray-drying the sol at 150-240°C to produce spherical amounts of alumina.
This method is less energy-intensive than the spray pyrolysis method.
3. Jet melting method
Plasma flame is used to melt aluminum powder and aluminum oxide powder directly. Then, annealing 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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