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China Suppliers Factory for Bubble Alumina Refractory Bricks - High-Temperature Resistance & Energy Saving Solutions
Features
Bubble alumina bricks have several distinctive features:
High Thermal Insulation
Their low thermal conductivity makes them excellent insulators, minimizing heat loss in high-temperature environments.
High Purity
Made from high-purity alumina, these bricks offer superior performance in extreme conditions.
Lightweight
The incorporation of alumina bubbles reduces the overall density, making the bricks lighter and easier to handle and install.
High Temperature Resistance
They can withstand very high temperatures, often above 1800°C, making them suitable for use in high-temperature furnaces and kilns.
Corrosion Resistance
They have good resistance to chemical attack, particularly from slags and molten metals.
Low Thermal Expansion
This feature helps maintain structural integrity and reduces the risk of cracking under thermal cycling.
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 Application
Widely used in the industries such as metallurgical, refractories, ceramics, petrochemical, glass, electricity, etc. It can be used as the hot face refractory lining of pyrolizer, hot blast furnace, reheating furnace, tunnel kiln, pushed slab kiln, crucible furnace, electric furnace, etc.
Typical Indexes
| Items | 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 | -0.255 | -0.25 |
| Thermal expansion coefficient x10-6 Room temp. 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
Q: What is the maximum service temperature of bubble alumina bricks?
Depending on the specific index grade, the maximum service temperature ranges from 1750°C (for BA-85) up to 1850°C (for BA-99 and BA-993).
Q: What makes bubble alumina bricks excellent for thermal insulation?
Their low thermal conductivity (ranging from 0.21 to 0.75 W/m·K at an average of 800°C) makes them superior insulators, effectively minimizing heat loss in high-temperature environments.
Q: In which industries are these bricks typically applied?
They are widely used in metallurgical, refractories, ceramics, petrochemical, glass, and electricity industries. They often serve as the hot face refractory lining for kilns and furnaces.
Q: What is the typical bulk density of bubble alumina bricks?
The bulk density typically ranges from 1.2 g/cm³ (for BA90-1.2) up to 1.9 g/cm³, providing a lightweight structure that is easy to handle and install while maintaining mechanical strength.
Q: Do bubble alumina bricks resist chemical corrosion?
Yes, they offer excellent corrosion resistance, particularly against chemical attacks from slags and molten metals, making them highly durable in operating conditions.