Corundum Brick
Corundum bricks are refractory bricks with an Al2O3 content greater than 90%. Also known as alumina refractory brick.
High normal temperature compressive strength (up to 340MPa). High load softening start temperature (greater than 1700°C). Good chemical stability, strong resistance to acidic or alkaline slag, metal and glass liquid. The thermal shock stability is related to its structure, the corrosion resistance of dense products is good, but the thermal shock stability is poor.
Corundum bricks are mainly used in key parts of kilns in steel, electronics, petrochemical, fertilizer, non-ferrous, refractory and other industries.
Corundum Brick Features
- The high cold compressive strength can reach 340MPa.
- The refractoriness at the initial stage of loading is high, greater than 1700°C.
- Good chemical stability.
- Has a strong resistance to acid and alkali slag erosion.
- Has strong resistance to metal and good melting and corrosion of glass.
- Thermal resistance is related to its structure.
- Dense foods are highly resistant to erosion.
Corundum Refractory Brick Process
Corundum bricks are made of alumina and quartz as raw materials. After casting, annealing and other processes, they are machined into bricks of a certain shape and size.
Corundum Brick Specifications
| Item | High Purity Corundum Brick | 99 Corundum Brick | 99 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 | ≥3.25 | ≥3.25 | ≥3.1 | ≥2.9 |
| Apparent porosity | ≤18 | ≤18 | ≤18 | ≤18 |
| Cold crushing strength | ≥100 | ≥100 | ≥120 | ≥120 |
| Refractoriness under load | ≥1700 | ≥1700 | ≥1700 | ≥1700 |
| Reheating linear change rate | -0.2 | -0.2 | 0.2 | 0.2 |
| Thermal expansion coefficient | 8.1 | 8.1 | 8.1 | 7.6 |
Corundum Brick Application
Corundum bricks are mainly used to make steelmaking electric furnaces, blast furnaces, reverberatory furnaces, hot blast furnaces, refining furnaces, glass kilns, cement rotary furnace linings, petrochemical industrial kilns and various high-temperature kiln linings.
In addition, high alumina bricks are also used as heat storage checker bricks for open hearth furnaces, plugs for casting systems, nozzle blocks, etc.
