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High Purity Bubble Alumina Refractory Bricks - China Suppliers & Factory for Industrial Furnace Efficiency
Key Features of Bubble Alumina Bricks
Bubble alumina bricks have several distinctive features that make them essential for high-temperature industrial applications:
1. High Thermal Insulation
Their low thermal conductivity makes them excellent insulators, minimizing heat loss in high-temperature environments.
2. High Purity
Made from high-purity alumina, these bricks offer superior performance in extreme conditions.
3. Lightweight
The incorporation of alumina bubbles reduces the overall density, making the bricks lighter and easier to handle and install.
4. High Temperature Resistance
They can withstand very high temperatures, often above 1800°C, suitable for high-temperature furnaces and kilns.
5. Corrosion Resistance
They have good resistance to chemical attack, particularly from slags and molten metals.
6. Low Thermal Expansion
Helps maintain structural integrity and reduces the risk of cracking under thermal cycling.
7. Mechanical Strength
Despite being lightweight, they offer good mechanical strength and durability under operating conditions.
These features make bubble alumina bricks particularly useful in industries like metallurgy, ceramics, and glass manufacturing.
Typical Applications
Widely used in industries such as metallurgical, refractories, ceramics, petrochemical, glass, and electricity. It can be used as the hot face refractory lining of pyrolizers, hot blast furnaces, reheating furnaces, tunnel kilns, pushed slab kilns, crucible furnaces, electric furnaces, and more.
Technical Indexes
| Items | Unit | BA-85 | BA-90 | BA90-1.2 | BA-99 | BA-993 |
|---|---|---|---|---|---|---|
| Max Service Temperature | ℃ | 1750 | 1800 | 1800 | 1850 | 1850 |
| AI2O3 | % | 85 | 90 | 91.2 | 99 | 99.3 |
| SiO2 | % | 14 | 8 | 8 | 0.2 | 0.15 |
| Fe2O3 | % | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 |
| Bulk Density | g/cm³ | 1.4-1.9 | 1.4-1.9 | 1.2 | 1.4-1.8 | 1.4-1.8 |
| Cold Crushing Strength | Mpa | 18 | 15 | 11.9 | 15 | 12 |
| Refractoriness under load (0.1 MPa, 0.6%) | °C | ≥ 1700 | ≥ 1700 | ≥ 1700 | ≥ 1700 | ≥ 1700 |
| Reheating Linear Change (1650°C x 12h) | % | ±0.3 | ±0.2 | ±0.2 | -0.25 | -0.25 |
| Thermal expansion coefficient x10⁻⁶ (RT to 1300°C) | - | 7.8 | 8 | 8 | 8.6 | 8.6 |
| Thermal Conductivity (Average 800°C) | W/m·K | 0.55 | 0.6 | 0.21 | 0.75 | 0.75 |
Frequently Asked Questions
What is the maximum service temperature of bubble alumina bricks?
Depending on the specific grade (such as BA-99 or BA-993), these bricks can withstand maximum service temperatures up to 1850°C.
Why are these bricks called "bubble" alumina?
They are manufactured using alumina bubbles, which are hollow spheres of alumina. This structure significantly reduces the density and thermal conductivity while maintaining high purity.
In which industries are these bricks most commonly used?
They are widely utilized in metallurgy, petrochemicals, ceramics, glass manufacturing, and power generation industries, particularly for furnace linings.
Do bubble alumina bricks provide good chemical resistance?
Yes, due to their high alumina content and purity, they offer excellent resistance to chemical attacks from slags and molten metals.
How does the lightweight nature benefit industrial operations?
The low density reduces the total weight of the furnace structure, making installation easier and reducing the thermal mass, which leads to faster heating and cooling cycles.
What is the typical thermal conductivity of these bricks?
At an average temperature of 800°C, the thermal conductivity ranges from approximately 0.21 to 0.75 W/m·K, providing superior insulation compared to dense alumina bricks.