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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 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 temperature resistance, wear resistance. oxidation resistance, wear resistance, high hardness and strength. 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 ways to prepare ultrafine spherical Alumina powder.
Method for preparation of spherical aluminum
Spraying is a quick and efficient way to prepare spherical aluminum. 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 produce alumina sol. Next, spray-drying at 150-240degC will dry the alumina sol to create spherical powder.
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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