Alumina hollow brick is a light-weight insulation material, which is made of alumina hollow balls and corundum powder fired at a high temperature of 1700℃. Alumina hollow bricks are composed of numerous interconnected hollow air cells, which leads to their lightweight characteristics. All the air bubbles are evenly distributed in the brick, forming a porous structure, which not only reduces the density of the brick but also maintains a high strength.
| Item/Grade | LQZ-99-1.4 | LQZ-99-1.6 | LQZ-99-1.8 | LQZ-95-1.4 | LQZ-95-1.6 | LQZ-95-1.8 | LQZ-90-1.4 | LQZ-90-1.6 | LQZ-90-1.8 |
|---|---|---|---|---|---|---|---|---|---|
| ω (Al2O3) ≥/% | 99 | 95 | 90 | ||||||
| ω (SiO2) ≤/% | 0.3 | / | / | ||||||
| ω (Fe2O3) ≤/% | 0.2 | 0.2 | 0.2 | ||||||
| Bulk Density (g/cm³) | 1.3-1.5 | 1.5-1.7 | 1.7-1.9 | 1.3~1.5 | 1.5-1.7 | 1.7-1.9 | 1.3-1.5 | 1.5-1.7 | 1.7-1.9 |
| Cold Crushing Strength ≥/MPa | 6 | 10 | 12 | 8 | 12 | 16 | 10 | 14 | 18 |
| Thermal Conductivity Coefficient (1000℃)/[W/(m·K)] | 0.9 | 1.1 | 1.2 | 0.9 | 1.1 | 1.2 | 0.9 | 1.1 | 1.2 |
| Permanent Linear Change (1600℃*3h)/% | -0.3~+0.3 | -0.3~+0.3 | -0.3~+0.3 | ||||||
The existence of hollow balls effectively blocks the conduction of heat in the material in the brick body and reduces the loss of heat. This feature makes alumina hollow bricks have an excellent effect in heat insulation.
The refractoriness of alumina hollow bricks is above 1850℃, and the bricks can maintain the stability and integrity of the structure in medium and high-temperature environments.
Using alumina hollow bricks as thermal insulation materials can reduce the energy consumption of industrial equipment. It can reduce heat loss and waste, and improve energy utilization in industrial production processes.
Aluminum oxide hollow bricks are made from natural aluminum oxide and other mineral components, free from harmful substances, and environmentally friendly. Their lightweight design also reduces energy consumption and resource usage during transportation and construction processes.
The excellent thermal insulation performance of alumina hollow bricks makes it necessary for various industries.
Refractory lining and insulation layer of the smelting furnace;
The insulation layer and furnace wall of the high-temperature heat treatment furnace;
The Insulation layer of the casting mold;
Refractory lining for chemical reactors;
Insulation for petrochemical plants;
Insulation for high-temperature pipes and vessels;
The insulation layer of high-temperature gas separation equipment;
Refractory lining and insulation layer of thermal power boiler;
Gas turbine insulation and furnace walls;
Refractory structures and insulation for nuclear power plants;
Alumina hollow bricks can also be used in oil and gas industry, steel foundry industry, glass industry. Welcome to Kerui to consult various ceramic fiber products!