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High-Performance Bubble Alumina Refractory Bricks from China Suppliers - Durable Factory Solution for Industrial Furnaces
Features
Bubble alumina bricks have several distinctive features:
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, making them suitable for use in 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
This feature 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 Application
Widely used in industries such as metallurgical, refractories, ceramics, petrochemical, glass, electricity, etc. 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, etc.
Typical Indexes
| Items | Unit | BA-85 | BA-90 | BA90-1.2 | BA-99 | BA-993 |
|---|---|---|---|---|---|---|
| Max Service Temperature | ℃ | 1750 | 1800 | 1800 | 1850 | 1850 |
| Al2O3 | % | 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 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 (FAQ)
What are bubble alumina bricks?
Bubble alumina bricks are lightweight, high-purity insulating refractory bricks made with hollow alumina bubbles. They offer excellent thermal insulation, low density, and high-temperature resistance, making them ideal for extreme environments.
What is the maximum service temperature of these bricks?
Depending on the grade, bubble alumina bricks can withstand temperatures ranging from 1750°C up to 1850°C. For instance, the BA-99 and BA-993 grades support a maximum service temperature of 1850°C.
In which industries are bubble alumina bricks typically used?
They are widely utilized in metallurgical, refractories, ceramics, petrochemical, glass, and electricity industries. They serve as hot face refractory linings in high-temperature kilns, furnaces, pyrolizers, and crucibles.
Do bubble alumina bricks resist chemical corrosion?
Yes, they exhibit excellent corrosion resistance, particularly against chemical attacks from slags and molten metals, which increases their durability in harsh industrial operating environments.
What is the typical thermal conductivity of these bricks?
At an average temperature of 800°C, the thermal conductivity ranges from 0.21 W/m·K (for BA90-1.2) to 0.75 W/m·K (for BA-99/BA-993), ensuring high thermal efficiency and minimal heat loss.