High Thermal Resistance Products
010203
Corundum Bricks-Hengli
Features
Corundum bricks, also known as alumina bricks, are high-alumina refractory products with several important features:
1. **High Purity: ** Typically composed of more than 90% alumina (Al2O3), ensuring excellent refractory properties.
2. **High Temperature Resistance: ** Capable of withstanding temperatures up to 1900°C, making them suitable for the most demanding high-temperature environments.
3. **Mechanical Strength: ** Corundum bricks have high compressive strength and good wear resistance, enabling them to handle heavy loads and abrasive conditions.
4. **Corrosion Resistance: ** They resist corrosion from slags, acids, alkalis, and other chemicals, extending their lifespan in harsh environments.
5. **Low Porosity: ** Low porosity helps prevent the infiltration of molten materials and gases, enhancing durability and thermal insulation properties.
6. **Thermal Stability: ** They exhibit excellent thermal stability and resistance to thermal shock, which is critical for processes involving rapid temperature changes.
7. **Dimensional Stability: ** High alumina content ensures that the bricks maintain their shape and volume at high temperatures, preventing structural failures.
These features make corundum bricks ideal for use in various high-temperature applications, including blast furnaces, hot blast stoves, steel ladles, and other industrial furnaces and kilns.
Typical Application
Widely used in the industries such as fertilizer, electro ceramics, petrochemical, steel, foundry, alloy steel, refractories, etc. Typical application such as secondary reformer and gas generator lining, catalyst bed support, channel induction furnace, reheating furnace hearth, etc.
Typical Indexes
| Grade | HA-99 | HA-98 | HA-90 | HA-80 | |
| AI2O3 | % | ≥97.5 | ≥97 | ≥90 | ≥80 |
| SiO2 | % | ≤0.18 | ≤0.2 | ≤8.5 | ≤18.5 |
| Fe2O3 | % | ≤0.05 | ≤0.1 | ≤0.2 | ≤0.3 |
| Bulk Density | g/cm3 | ≥3.15 | ≥3.1 | ≥3.1 | ≥2.9 |
| Apparent Porosity | % | ≤16 | ≤17 | ≤18 | ≤18 |
| Cold Crushing Strength | MPa | ≥110 | ≥100 | ≥120 | ≥120 |
| Refractoriness under load (0.1 MPa, 0.6%) | °C | ≥ 1700 | ≥ 1700 | ≥ 1700 | ≥ 1700 |
| Reheating Linear Change (1600°C x8h) | % | ≥-0.2 | ≥-0.2 | ≤0.2 | ≤0.2 |
| Thermal expansion coefficient x10-6 Room temp. to 1300°C | 8.1 | 8.1 | 8.1 | 7.6 |
