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Bubble alumina is an effective high-temperature thermal insulator in structural applications and is appropriate for use at temperatures as high as 1825°C. Bubble alumina’s structure consists primarily of closed, thin-walled cells that combine to give it exceptional hot strength, high creep resistance, low density, and low thermal conductivity. It is pre-fired, contains no organics, and exhibits high microwave and RF transparency. Its high alumina content makes it compatible with many extreme chemical environments. Bubble alumina is manufactured on a custom basis and can be supplied in many sizes. Bubble alumina can achieve the trade‐off between lightweight and overall performance. This material works well to coat a lined forge for protection against flux when welding.
Bubble alumina mix 0.2-5mm production process：
Alumina raw materials are melted in an electric arc furnace at 2200℃. When pouring the melt out, blow the melt with high-pressure air to make the melt dispersed into tiny droplets. The droplets form alumina hollow balls during the cooling process due to surface tension effects. The hollow balls are screened to remove fine powder and big fragments and particles. Iron is removed with the magnetic iron. Broken balls are removed with a ball selecting machine. Then the alumina hollow spheres are packed as the finished products.
Bubble alumina mix 0.2-5mm Features and performance:
Bubble alumina, the crystal form is a-Al2O3 microcrystal. Bubble alumina has low bulk density, low impurity content, and low thermal conductivity. Bubble alumina is the main body, which can be made into products of various shapes. The maximum service temperature is 1800 ° C. The mechanical strength of the products is high, which is several times that of ordinary light products, and the bulk density is only one-half of the corundum products.
Applications of bubble alumina mix 0.2-5mm：
Bubble alumina spheres and their products are lightweight refractory materials with high-temperature resistance and excellent energy-saving and stability. Bubble alumina can be used as high temperature, ultra-high temperature insulation fillers, high-temperature refractory concrete lightweight materials, high-temperature castables, etc. bubble alumina refractory bricks can be used for high-temperature energy saving (>30%) down the flame kiln, shuttle kiln, molybdenum wire furnace, tungsten rod furnace, induction furnace, nitriding furnace, etc. Significant results have been achieved in reducing the weight of the furnace body, transforming the structure, saving materials and energy, and saving energy by more than 40%. Alumina hollow balls have been widely used in high temperature and ultra-high temperature furnaces such as petrochemical industrial gasifiers, carbon black industrial reaction furnaces, metallurgical industrial induction furnaces, etc., and have achieved very satisfactory energy-saving effects.
Chemical compositions of alumina bubble 0.2-5mm:
| Chemical compositions | Index |
| Al2O3 (%) ≥ | 99 |
| SiO2 (%) ≤ | 0.2 |
| Na2O (%) ≤ | 0.25 |
| Fe2O3 (%) ≤ | 0.15 |
| Maximum Working Temperature (℃) | 1850 |
| Granularity (mm) | 0.2-5 |
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