High Purity Corundum Bricks from China - Suppliers & Factory for High Temperature Applications
Features
Typically composed of more than 90% alumina (Al2O3), ensuring excellent refractory properties.
Capable of withstanding temperatures up to 1900°C, making them suitable for the most demanding high-temperature environments.
Corundum bricks have high compressive strength and good wear resistance, enabling them to handle heavy loads and abrasive conditions.
They resist corrosion from slags, acids, alkalis, and other chemicals, extending their lifespan in harsh environments.
Low porosity helps prevent the infiltration of molten materials and gases, enhancing durability and thermal insulation properties.
They exhibit excellent thermal stability and resistance to thermal shock, which is critical for processes involving rapid temperature changes.
High alumina content ensures that the bricks maintain their shape and volume at high temperatures, preventing structural failures.
Typical Application
Typical Indexes
| Grade | Unit | HA-99 | HA-98 | HA-90 | HA-80 |
|---|---|---|---|---|---|
| Al2O3 | % | ≥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 |
Frequently Asked Questions
What are the primary characteristics of corundum bricks?
Corundum bricks are high-alumina refractory products characterized by high purity (typically >90% Al2O3), high temperature resistance up to 1900°C, high mechanical strength, chemical corrosion resistance, low porosity, and excellent thermal and dimensional stability.
In which industries are corundum bricks typically used?
They are widely used in demanding industrial sectors including petrochemical, steel, alloy steel, foundry, electro ceramics, fertilizer, and refractories.
What are the specific applications of corundum bricks in furnaces?
Typical applications include secondary reformers, gas generator linings, catalyst bed supports, channel induction furnaces, and reheating furnace hearths.
How do corundum bricks perform under high thermal shock?
Thanks to their excellent thermal stability, corundum bricks show high resistance to thermal shock, making them suitable for processes with rapid temperature cycles.
What is the difference between HA-99 and HA-80 grades?
HA-99 contains ≥97.5% Al2O3 with a bulk density of ≥3.15 g/cm³, whereas HA-80 contains ≥80% Al2O3 with a bulk density of ≥2.9 g/cm³. Higher grades offer higher purity and lower silica (SiO2) impurities.