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High Purity Corundum Bricks from China Suppliers - Premium Factory Manufactured for Superior Performance
Features
Corundum bricks, also known as alumina bricks, are high-alumina refractory products with several important features:
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1. High Purity: Typically composed of more than 90% alumina (Al2O3), ensuring excellent refractory properties.
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2. High Temperature Resistance: Capable of withstanding temperatures up to 1900°C, making them suitable for the most demanding high-temperature environments.
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3. Mechanical Strength: Corundum bricks have high compressive strength and good wear resistance, enabling them to handle heavy loads and abrasive conditions.
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4. Corrosion Resistance: They resist corrosion from slags, acids, alkalis, and other chemicals, extending their lifespan in harsh environments.
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5. Low Porosity: Low porosity helps prevent the infiltration of molten materials and gases, enhancing durability and thermal insulation properties.
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6. Thermal Stability: They exhibit excellent thermal stability and resistance to thermal shock, which is critical for processes involving rapid temperature changes.
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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 | Unit | 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 |
All data above are average test results under standard procedure and are subjected to variation. Result should not be used for specification purpose or creating any contractual obligation. For more information on the safety application or materials, please contact with our sales engineer.
Frequently Asked Questions
What is the maximum temperature corundum bricks can withstand?
Corundum bricks are designed for extreme high-temperature environments and can withstand temperatures up to 1900°C, making them ideal for the most demanding industrial kilns.
What is the typical alumina (Al2O3) content in these bricks?
High-quality corundum bricks typically contain more than 90% alumina. Our HA-99 grade, for example, features an Al2O3 content of ≥97.5%.
How do corundum bricks perform against chemical corrosion?
They offer excellent corrosion resistance against slags, acids, alkalis, and various chemicals, which significantly extends their service life in harsh chemical environments.
Why is low porosity important for alumina bricks?
Low porosity prevents the infiltration of molten materials and gases into the brick structure, which enhances both the durability and the thermal insulation properties of the lining.
In which industries are these bricks most commonly used?
They are widely used in the petrochemical, steel, foundry, fertilizer, and electro ceramics industries, specifically for linings in secondary reformers, gas generators, and induction furnaces.
Do these bricks maintain their shape at high temperatures?
Yes, they exhibit excellent dimensional stability and high mechanical strength, ensuring they maintain their shape and volume even under heavy loads at extreme temperatures.