Alumina hollow spheres The formation process of alumina melt is carried out in a short time period (10~30s) under high pressure gas injection. The whole process of pelletizing is actually a short process of cooling and shrinking. The melting point of alumina is 2050 C, and the temperature suitable for blowing ball should be higher than melting point 200~300 C, that is, heating to 2200~2300 C. If the melt temperature is low and viscosity is large, it is easy to blow into thick wall balls or honeycomb hollow spheres.
Blowing Alumina hollow spheres There are 3 stages.
One is melting stage to raise the temperature and reduce the viscosity of the melt.
The two is blowing stage.
The three is the cooling and curing stage.
Alumina hollow spheres The formation mechanism is a rapid shrinkage process of a high temperature molten alumina after injection. The process is that the alumina melt is blown into numerous small droplets under the action of high-pressure air injection. These droplets fall in the air by parabolic path. In this process, small droplets first form a small ball under the action of surface tension and centrifugal force. When the small ball is quenched, the surface solidified instantly, and the interior of the sphere is still in a liquid state. Under the centrifugal force function, the melt also has a large volume contraction, so that the melt quickly and uniformly condenses on the hollow sphere shell, and has completed the whole process of the hollow sphere.
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