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Alumina hollow ball is a new kind of high temperature heat insulation material, it is placed in the industrial alumina content of more than 98% in the arc furnace high temperature melting, using compressed air to blow liquid alumina into air ball alumina hollow ball.Alumina hollow ball can be made into various shapes of products, the highest temperature of 1800 degrees Celsius, the mechanical strength of the products is high, several times of the general light products, and the volume density is only half of corundum products.
The characteristics
It is characterized by high melting point, good thermal stability, high hardness, good wear resistance, high mechanical strength, good electrical insulation and corrosion resistance
Alumina hollow ball has mixed grade ball and grading ball two kinds:
The particle size of mixed grade ball is 0.2-5mm,
The particle sizes of the grading balls were 0.2-1mm,1-2mm,2-3mm and 3-5mm respectively.
Chemical index | ||||||||
size | Al2O3 | Fe2O3 | SiO2 | Na2O | MgO | K2O | Cao | |
0.2-5mm | ≥99% | ≤0.15% | ≤0.3% | ≤0.5% | ≤0.1% | ≤0.1% | ≤0.1% | |
Physical index | ||||||||
（Bulk density） | Refractoriness | Appearance | ||||||
0.5-1g/cm3 | 18000C | White hollow ball | ||||||
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