China Suppliers Factory of High-Quality Bubble Alumina Refractory Bricks for Industrial Furnace Applications
Features
Their low thermal conductivity makes them excellent insulators, minimizing heat loss in high-temperature environments.
Made from high-purity alumina, these bricks offer superior performance in extreme conditions.
The incorporation of alumina bubbles reduces the overall density, making the bricks lighter and easier to handle and install.
They can withstand very high temperatures, often above 1800°C, making them suitable for use in high-temperature furnaces and kilns.
They have good resistance to chemical attack, particularly from slags and molten metals.
This feature helps maintain structural integrity and reduces the risk of cracking under thermal cycling.
Despite being lightweight, they offer good mechanical strength and durability under operating conditions.
Typical Application
Widely used in the industries such as metallurgical, refractories, ceramics, petrochemical, glass, electricity, etc. Its 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 | 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 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
What are the primary benefits of using bubble alumina bricks?
Bubble alumina bricks offer high thermal insulation, extreme temperature resistance (up to 1850°C), low thermal expansion, excellent corrosion resistance against slag, high purity, and a lightweight structure that allows for easy installation and handling.
In which industries are these bricks commonly applied?
They are widely applied in metallurgical, refractories, ceramics, petrochemical, glass, and electricity industries. They typically serve as the hot face refractory lining in high-temperature kilns, furnaces, pyrolizers, and crucibles.
What is the maximum service temperature for the BA-99 and BA-993 grades?
Both BA-99 and BA-993 grades feature a maximum service temperature of 1850°C, making them suitable for the most demanding high-temperature applications.
How does the bulk density of bubble alumina bricks compare to dense bricks?
Due to the hollow alumina bubbles, these bricks have a low bulk density ranging from 1.2 to 1.9 g/cm³, which significantly reduces the structural weight of furnaces while maintaining high insulation performance.
Do bubble alumina bricks resist chemical corrosion?
Yes, because they are made of high-purity alumina (up to 99.3% Al2O3), they provide excellent resistance to chemical attacks, particularly from molten metals and acidic slags.