China Bubble Alumina Refractory Bricks Factory - High-Quality Suppliers for Industrial Furnace Solutions
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.
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. 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
Bubble alumina bricks offer high thermal insulation, lightweight handling, low thermal expansion, excellent mechanical strength, and superior resistance to chemical corrosion at temperatures exceeding 1800°C.
Depending on the specific grade, the maximum service temperature ranges from 1750°C (for BA-85) up to 1850°C (for BA-99 and BA-993).
They incorporate hollow alumina bubbles during manufacturing, which significantly reduces their bulk density (ranging from 1.2 to 1.9 g/cm³) while maintaining structural integrity.
They are widely used in metallurgical, refractories, ceramics, petrochemical, glass, and electricity industries, particularly as hot face linings for high-temperature kilns and furnaces.
Thanks to their high-purity alumina composition, they provide excellent resistance against chemical attacks, especially from slags and molten metals under harsh operating conditions.