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Brief introduction of corundum bricks
Corundum brick refers to refractory brick products with Al2O3 content greater than 90% and refractory products with corundum as the main crystal phase. High compressive strength at room temperature (up to 340MPa), high softening temperature under load (more than 1700℃), strong chemical stability, hardness up to 9 Mohs grade, high melting point, acid or alkaline slag, metal and glass liquid resistance.
Advantages of corundum bricks
Corundum brick has acid and alkali chemical properties of slag, metal and glass melt, it can be used in high temperature oxidation atmosphere, reducing atmosphere can receive good effect.
Application of corundum bricks
Corundum bricks are mainly used in ironmaking blast furnaces and blast furnace hot blast furnaces, outside steelmaking furnaces, sliding water furnaces, glass melting furnaces and petrochemical industrial furnaces, etc.
More relevant refractory products: Ceramic fiber cotton
Parameters of corundum bricks
| ltem | Ultra Purity Corundum Brick | 99 Corundum Brick | 90 Corundum Brick | Corundum-Mullite Brick |
| Al2O3% | ≥99.3 | ≥98.5 | ≥90 | ≥80 |
| SiO2% | ≤0.15 | ≤0.3 | ≤8.5 | ≤18.5 |
| Fe2O3% | ≤0.1 | ≤0.2 | ≤0.2 | ≤0.3 |
| Bulk density, g/cm3 | ≥3.25 | ≥3.25 | ≥3.1 | ≥2.9 |
| Apparent porosity, % | ≤18 | ≤18 | ≤18 | ≤18 |
| Cold crushing strength, MPa | ≥100 | ≥100 | ≥120 | ≥120 |
| Refractoriness under load, ℃(0.2MPa,0.6%) | ≥1700 | ≥1700 | ≥1700 | ≥1700 |
| Reheating linear change rate, %(1600℃ x 8h) | -0.2 | -0.2 | 0.2 | 0.2 |
| Thermal expansion coefficient, x 10-6 (Room temp. to 1300’C) | 8.1 | 8.1 | 8.1 | 7.6 |
Parameters of Fused zirconium corundum brick
| ltem | AZS-33 | AZS-33 | AZS-36 | AZS-36 | AZS-41 | AZS-41 |
| Y | H | Y | H | Y | H | |
| Al2O3≥ | 50 | 50.5 | 48 | 49 | 45 | 45.5 |
| ZrO2≥ | 32.0 | 32.0 | 35.0 | 35.0 | 40.0 | 40.0 |
| SiO2≤ | 15.0 | 16.0 | 13.5 | 13.5 | 13.0 | 12.0 |
| Na2O≤ | 1.5 | 1.5 | 1.4 | 1.4 | 1.3 | 1.3 |
| BD, PT.QX ≥ | 3.40 | 3.30 | 3.45 | 3.40 | 3.55 | 3.50 |
| BD, MS≤ | 3.50 | 3.45 | 3.60 | 3.55 | 3.70 | 3.65 |
| BD, WS≤ | 3.60 | 3.55 | 3.70 | 3.65 | 3.80 | 3.75 |