Machinery Pressing Shaped Products
01
Bubble Alumina Refractory Bricks for Industrial Furnace
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 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 | 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 |