Fused corundum bricks are made by melting alumina in an electric arc furnace and casting it into a model of a specified specific shape. After annealing and heat preservation, the required product is obtained by processing with diamond abrasive tools.
Introduction to three types of fused corundum bricks
- Fused α-corundum brick is mainly composed of α-Al2O3, which has high-temperature resistance, strong alkali resistance, compact structure, excellent chemical stability, strong wear resistance, and is far more resistant to various slags than other aluminum silicates. It is an ideal material for metallurgical electrolytic cells and sliding rail bricks for heating furnaces.
- Fused β-corundum bricks are mainly composed of β- Al2O3, with dense structure and strong spalling resistance, especially showing extremely high corrosion resistance to strong alkali vapor, no pollution to molten glass, and are used for upper structures with less glass raw materials scattered.
- Fused α-β corundum brick is composed of about 50% of α- Al2O3 and β- Al2O3. The two crystals interlace to form a dense structure, which has excellent alkali resistance, and the corrosion resistance of molten glass is comparable to that of AZS bricks and does not pollute the glass liquid. , Mainly used for high-grade glass furnaces working pool walls and pavement, forehearth and passage, etc.
Technical Parameter of Fused Corundum Brick
| Item | Index | ||
| Fused Cast α Corundum Bricks | Fused Cast β Corundum Bricks | Fused Cast α-β Corundum Bricks | |
| Al2O3 % | 98 | 92 | 94.0 |
| Na2O % | 1.0 | 6.5 | 4.0 |
| SiO2+CaO+Fe2O3+TiO2 % | ≤1.0 | ≤1.5 | ≤2.0 |
| α-Corundum % | 90 | 2 | 44 |
| β-Corundum % | 4 | 97 | 55 |
| Glass Phase % | 6 | 1 | 1 |
| Bulk Density (Dense part) g/cm3 | 3.3 | 3.1 | 3.3 |
| Cold Crushing Strength MPa | 200 | 50 | 200 |
| 0.2Mpa Refractoriness Under Load ℃ | 1700 | 1700 | / |
| Static Resistance To Liquid Glass Erosion Depth mm/24h Ordinary Soda Lime Glass 1350℃×48h | / | / | 0.3 |
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