China Bubble Alumina Refractory Bricks Factory - High-Quality Suppliers for Industrial Furnaces
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
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 (FAQ)
Bubble alumina bricks feature high thermal insulation, high purity, lightweight structure, high-temperature resistance up to 1850°C, corrosion resistance, low thermal expansion, and reliable mechanical strength.
Depending on the specific index, the maximum service temperature ranges from 1750°C (for BA-85) up to 1850°C (for BA-99 and BA-993).
They are widely applied in metallurgical, refractories, ceramics, petrochemical, glass, and electricity industries, specifically for hot face linings in furnaces and kilns.
The incorporation of alumina bubbles reduces the bulk density (down to 1.2 - 1.9 g/cm³), which makes the bricks easier to handle and install while minimizing overall structural weight.
Yes, because they are made from high-purity alumina (up to 99.3% Al2O3), they provide excellent corrosion resistance against chemical attacks, slags, and molten metals.