Fused corundum brick are melted in an electric arc furnace and cast into a specified shape of the model, through annealing and heat preservation, and then processed of diamond grinding tools, to obtain the required product. The α-Al2O3 and β-Al2O3 crystal phases are mainly composed of about 50%. The product is densely crystallized and below 1350 °C. It has excellent corrosion resistance to glass. Therefore, it is widely used in glass furnace working pools and later. The parts, usually used, are chutes, lip tiles, gate bricks, and the like. The Fused corundum brick has high purity and is difficult to be sintered, it needs to be fired at more than 1800 degrees.
The fused corundum brick is mainly used for the key parts of industrial kiln that require wear resistance and high temperature resistance, such as steel rail-type metallurgical furnace slide rail brick, step-type heating furnace steel tapping tank, garbage incinerator lining, petrochemical industry, the lining of the industrial furnace, the bottom of the rolling mill, the secondary converter of the ammonia synthesis furnace.
Technical Parameter of Fused Corundum Bricks:
| Item | Fused Corundum Brick | ||
| Chemical Composition % | Al2O3 | ≥93 | ≥98 |
| SiO2 | ≤5.0 | ≤0.2 | |
| Fe2O3 | ≤0.1 | ≤0.1 | |
| CaO | ≤1.2 | ≤1.2 | |
| Na2O | – | – | |
| ZrO2 | – | – | |
| Cr2O3 | – | – | |
| Apparent Porosity (%) | ≤17 | ≤17 | |
| Bulk Density （g/cm3） | ≥3.15 | ≥3.2 | |
| Cold Crushing Strength （Mpa） | ≥100 | ≥100 | |
| Anti Bending Temperature（1250℃ Mpa） | ≥9.5 | ≥9.5 | |
| Refractoriness （℃） | ≥1900 | ≥1850 | |
| Load softening start temperature（0.2Mpa T0.6 ℃） | ≥1700 | ≥1680 | |
| Permanent Linear Change On Reheating（1600℃×3h ％） | ≤±0.2 | ≤±0.2 | |
