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China Alumina Bubble Brick Suppliers - High-Performance Lightweight Refractory Factory for Industrial Furnaces
Core Advantages
Superior Thermal Insulation Performance
The unique hollow sphere structure minimizes thermal conductivity, effectively reducing heat loss in high-temperature equipment. Compared to traditional refractory bricks, cutting operational costs significantly.
Lightweight & High Strength
With low bulk density (1.4–1.7 g/cm³), it eases equipment load and simplifies installation. Meanwhile, high alumina purity ensures excellent mechanical strength and wear resistance, avoiding cracking under extreme temperature changes.
Exceptional High-Temp Stability
Made of high-purity alumina (Al₂O₃ ≥90%), it can withstand continuous temperatures up to 1800°C and resist corrosion from molten metal, slag, and chemical media, extending the service life of furnace linings.
Product Parameters
| Item | Alumina Bubble Brick | ||
|---|---|---|---|
| Property | Grade ≥85% | Grade ≥90% | Grade ≥99% |
| Al₂O₃ % | ≥85 | ≥90 | ≥99 |
| Fe₂O₃ % | ≤0.20 | ≤0.20 | ≤0.20 |
| Bulk Density (g/cm³) | 1.4–1.7 | 1.4–1.7 | 1.4–1.7 |
| Cold Crushing Strength (MPa) | ≥12 | ≥10 | ≥9 |
| Refractoriness Under Load (℃) (0.2MPa, 0.6%) |
≥1650 | ≥1700 | ≥1700 |
| Permanent Linear Change 1600℃ × 3h |
±0.3 | ±0.3 | ±0.3 |
| Coefficient of Thermal Expansion (Room Temp – 1300℃) |
~7.8 | ~0.8 | ~8.6 |
| Thermal Conductivity | ≤0.80 | ≤1.30 | ≤1.50 |
Detailed Application Scenarios
1
Metallurgical Industry
Widely used in lining of blast furnace hot blast stoves, electric arc furnaces, and ladle tundishes. It resists high-temperature erosion from molten steel and slag, improves thermal insulation effect, and ensures stable production of metallurgical equipment.
2
Ceramic & Glass Industry
Suitable for kiln linings in ceramic tile, sanitary ware, and glass melting furnaces. Its excellent thermal insulation reduces heat loss during firing, maintains uniform furnace temperature, and enhances product quality while saving energy.
3
Petrochemical Industry
Applied in linings of catalytic cracking units, reforming furnaces, and hydrogenation reactors. It withstands high temperatures and chemical corrosion, ensures safe operation of equipment, and extends maintenance cycles.
4
Other High-Temp Equipment
Also used in waste incinerators, industrial boilers, and solar thermal power generation equipment. It adapts to complex high-temperature environments, improves equipment efficiency, and reduces environmental pollution.
Conclusion
Contact us now for a quote and experience the difference of working with the best in the business.
Frequently Asked Questions
Q
What is the maximum operating temperature of Alumina Bubble Brick?
Alumina Bubble Brick made with high-purity alumina (Al₂O₃ ≥90%) can withstand continuous operating temperatures of up to 1800°C, making it one of the most thermally stable refractory materials available for industrial furnace linings.
Q
What are the available grades of Alumina Bubble Brick?
We offer three main grades based on Al₂O₃ content: ≥85%, ≥90%, and ≥99%. Each grade is tailored to specific application requirements in terms of thermal conductivity, refractoriness under load, and cold crushing strength.
Q
Why is Alumina Bubble Brick considered lightweight compared to traditional refractory bricks?
The hollow sphere (bubble) microstructure of the alumina aggregate significantly reduces the bulk density to 1.4–1.7 g/cm³. This makes the brick substantially lighter than conventional dense refractory bricks, reducing the overall structural load on furnaces and equipment while simplifying installation.
Q
In which industries is Alumina Bubble Brick most commonly used?
Alumina Bubble Brick is widely used across metallurgy (blast furnaces, electric arc furnaces, ladle tundishes), ceramics and glass (kiln linings, glass melting furnaces), petrochemicals (catalytic cracking units, reforming furnaces), and other high-temperature applications such as industrial boilers and waste incinerators.
Q
How does Alumina Bubble Brick help reduce energy costs?
The hollow sphere structure of the brick creates an inherently low thermal conductivity (as low as ≤0.80 W/m·K for the ≥85% grade). This superior insulation minimizes heat loss through furnace walls, maintaining higher internal temperatures with less fuel input, which directly translates into significant energy savings and reduced operational costs.
Q
Can Alumina Bubble Brick resist chemical corrosion from molten metals and slag?
Yes. The high alumina purity (up to Al₂O₃ ≥99%) provides excellent chemical inertness, enabling the brick to resist corrosion from molten metal, slag, and various chemical media encountered in metallurgical and petrochemical processes. This resistance significantly extends the service life of furnace linings and reduces maintenance frequency.