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Product introduction of corundum bricks
Corundum is a common refractory raw material, corundum has high temperature resistance, high strength, high hardness, electrical insulation, corrosion resistance and other physical and chemical properties, is widely used in the refractory industry. The melting point of corundum is as high as 2050°C. The refractoriness of high quality corundum products is greater than 1900°C. The load softening starts at about 1850°C, the ultimate use temperature is 1950°C, and the long-term use temperature is 1800°C.
Classification of corundum bricks
Corundum brick basic raw materials are sintered corundum and electrofused corundum, respectively, made of sintered corundum brick and electrofused corundum brick two, can also be added to other mineral raw materials, the formation of composite materials, such as zirconium corundum brick, chromium corundum brick, titanium corundum brick, etc., to improve its use of performance, adapt to a variety of use environment.
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 |