Products
Corundum Brick
• Al₂O₃ Content: ≥80–99.3%
• Bulk Density: ≥2.90–3.25 g/cm³
• Apparent Porosity: ≤18%
• Cold Crushing Strength: ≥100–120 MPa
• Refractoriness Under Load: ≥1700°C
• Function: High Temperature Resistance & Slag Resistance & Wear Resistance & Chemical Stability
Product Introduction
Corundum Brick is a high-alumina refractory brick with corundum as the main crystalline phase. It is manufactured from high-purity sintered corundum, fused corundum or selected alumina raw materials through forming and high-temperature firing.
The product generally contains at least 90% Al₂O₃, while high-purity grades can contain more than 99% Al₂O₃. Its dense structure provides high mechanical strength, high refractoriness under load and good stability in demanding high-temperature environments.
Corundum Brick is suitable for industrial furnace areas exposed to high temperatures, molten materials, chemical corrosion, abrasion and hot gas scouring. According to the selected grade and operating conditions, the working temperature can reach approximately 1800°C.
Different raw materials and additives can be used to manufacture sintered corundum brick, fused corundum brick and corundum composite bricks. Zirconia, chromium oxide, mullite and other materials may also be introduced to improve performance for specific furnace environments.
Feature:
- High alumina content.
- High refractoriness.
- High refractoriness under load.
- High cold crushing strength.
- Good high-temperature volume stability.
- Good chemical stability.
- Good resistance to acidic slag.
- Good resistance to basic slag.
- Good molten metal resistance.
- Good glass corrosion resistance.
- Good abrasion resistance.
- Dense and strong refractory structure.
- Suitable for severe high-temperature environments.
The reference product reports refractoriness under load above 1700°C and good resistance to acidic slag, basic slag, molten metal and glass corrosion.
Application:
Corundum Brick is mainly used as a working lining in high-temperature industrial furnaces and kiln areas requiring high strength, wear resistance and corrosion resistance.
Typical applications include:
- Metallurgical heating furnaces
- Walking beam furnaces
- Furnace slide rails
- Furnace skid rails
- Steel tapping troughs
- Hot metal launders
- Waste incinerators
- Petrochemical kilns
- Petrochemical reactors
- High-temperature furnace walls
- High-temperature furnace roofs
- Glass furnaces
- Ceramic kilns
- Carbon furnaces
- High-temperature burner areas
- Refractory precast and shaped components
The reference manufacturer specifically lists metallurgical furnace slide rails, walking heating furnace tapping troughs, waste-incinerator linings and petrochemical kiln linings as typical uses.
The correct grade should be selected according to operating temperature, furnace atmosphere, slag composition, mechanical load, abrasion intensity and thermal cycling conditions.
Technical Data:
Corundum fire bricks index:
| 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 |
Fused zirconium corundum brick index:
| 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 |
