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China Suppliers Factory Alumina Bubble Brick for Industrial Furnaces - Lightweight Refractory Material
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 | ||
|---|---|---|---|
| Grade | Al₂O₃ ≥85% | Al₂O₃ ≥90% | Al₂O₃ ≥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 service temperature of Alumina Bubble Brick?
Alumina Bubble Brick made with Al₂O₃ ≥90% can withstand continuous operating temperatures up to 1800°C, making it suitable for the most demanding high-temperature industrial furnace applications.
Q
What are the available Al₂O₃ content grades for Alumina Bubble Brick?
We offer three standard grades: Al₂O₃ ≥85%, Al₂O₃ ≥90%, and Al₂O₃ ≥99%. Each grade provides different levels of refractoriness, thermal conductivity, and mechanical strength to meet varied industrial requirements.
Q
How does Alumina Bubble Brick compare to traditional refractory bricks in terms of thermal insulation?
Thanks to its unique hollow sphere structure, Alumina Bubble Brick has significantly lower thermal conductivity (≤0.80 to ≤1.50 W/m·K depending on grade) compared to dense refractory bricks. This translates to reduced heat loss, lower energy consumption, and notable operational cost savings.
Q
Which industries are best suited for using Alumina Bubble Brick?
Alumina Bubble Brick is widely used across the metallurgical industry (blast furnaces, electric arc furnaces), the ceramic and glass industry (kiln linings, glass melting furnaces), the petrochemical industry (catalytic cracking units, reforming furnaces), and other high-temperature equipment such as industrial boilers and waste incinerators.
Q
What is the bulk density of Alumina Bubble Brick and why does it matter?
The bulk density of Alumina Bubble Brick ranges from 1.4 to 1.7 g/cm³ across all grades. This low density significantly reduces the structural load on high-temperature equipment, simplifies installation, and lowers transportation costs, while still maintaining excellent mechanical strength and wear resistance.
Q
Can Alumina Bubble Brick resist chemical corrosion from molten metals and slag?
Yes. The high alumina purity (Al₂O₃ ≥90% or ≥99%) provides exceptional resistance to chemical attack from molten metal, slag, and various chemical media. This corrosion resistance greatly extends the service life of furnace linings and reduces maintenance frequency and downtime.