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Product introduction of corundum bricks
The raw material of corundum brick is a solid solution synthesized by melting alumina and chromic oxide in a certain proportion at high temperature. Using special refractory production process to produce refractory bricks can improve the internal quality of products and improve the high-temperature performance of products.
Features of corundum bricks
The corundum brick has chemical properties such as acid resistance, alkali residue, metal and molten glass. It can be used well in high-temperature oxidation atmosphere and reduction atmosphere.
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 |