Products
Alumina Bubble Brick
• Al₂O₃ Content: ≥85–99%
• Bulk Density: 1.4–1.7 g/cm³
• Max Service Temperature: 1680–1800°C
• Cold Crushing Strength: ≥9–12 MPa
• Apparent Porosity: 58–62%
• Function: High Temperature Resistance & Lightweight & Thermal Insulation & Energy Saving
Product Introduction
Alumina Bubble Brick is a lightweight high-alumina refractory brick made from alumina hollow spheres, high-purity alumina powder and suitable bonding materials. The shaped bricks are fired at high temperatures to form a strong and stable refractory structure.
The alumina hollow spheres inside the brick create a large number of closed pores. This structure gives the product low bulk density, low thermal conductivity, low heat storage and good thermal insulation performance.
Compared with conventional dense refractory bricks, Alumina Bubble Brick can reduce the total weight of the furnace lining while maintaining good mechanical strength and high-temperature stability.
Alumina Bubble Brick contains 85% to 99% Al₂O₃. Different grades are available for operating temperatures from 1680°C to 1800°C. It is suitable for high-temperature and ultra-high-temperature industrial furnaces where both thermal insulation and structural strength are required.
Features
- High alumina content.
- High service temperature.
- Low bulk density.
- Good thermal insulation performance.
- Low thermal conductivity.
- Low heat storage capacity.
- Good mechanical strength.
- Good thermal stability.
- Low reheating linear change.
- Good resistance to aggressive gases.
- Good resistance to slag erosion.
- Reduced furnace lining weight.
- Improved furnace energy efficiency.
Applications
Alumina Bubble Brick is mainly used as a lightweight working lining or thermal insulation lining in high-temperature and ultra-high-temperature industrial furnaces.
Typical applications include:
- High-temperature shuttle kilns
- Down-draft kilns
- Molybdenum furnaces
- Tungsten rod furnaces
- Induction furnaces
- Nitriding furnaces
- Petrochemical gasifiers
- Carbon black reactors
- Metallurgical furnaces
- Electric furnaces
- High-temperature laboratory furnaces
- Furnace walls and roofs
- High-temperature equipment insulation
- Other ultra-high-temperature thermal equipment
Alumina Bubble Brick can help reduce the weight and heat storage of the furnace lining. It is especially suitable for furnace areas requiring high-temperature resistance, thermal insulation and good dimensional stability.
For areas exposed to severe mechanical impact, strong abrasion or direct contact with molten materials, the lining structure and refractory grade should be selected according to the actual operating conditions.
Technical Data:
| Item | Alumina Bubble Brick | ||
| Grade | AKZ-85 | AKZ-90 | AKZ-99 |
| Al2O3 | ≥85 | ≥90 | ≥99 |
| SiO2 | ≤13 | ≤8 | ≤0.2 |
| Fe2o3 | ≤0.5 | ≤0.5 | ≤0.5 |
| Refractoriness℃ | 1750 | 1770 | 1790 |
| Apparent Porosity ％ | 58-62 | 58-62 | 58-62 |
| Bulk Density g/cm3 | 1.4-1.7 | 1.4-1.7 | 1.4-1.7 |
| Cold Crushing Strength Mpa | ≥12 | ≥10 | ≥9 |
| 0.2Mpa RefractorinessUnder Load T0.6℃ | ≥1650 | ≥1700 | ≥1700 |
| Permanent Linear Change On Reheating % 1500℃X2h | ±0.3 | ±0.3 | ±0.3 |
| 20-1300℃ Thermal Expansion % x 10-6 | 0-7.8 | 0-8.0 | 0-8.6 |
| Thermal Conductivity Average 800℃ W/m.k | ≤0.8 | ≤1.3 | ≤1.5 |
| Max Service Temperature ℃ | 1680 | 1700 | 1800 |
The technical data above are typical reference values. Final specifications may vary according to product grade, raw materials, brick dimensions, manufacturing process and testing methods.
Customized sizes and special-shaped Alumina Bubble Bricks are available according to furnace drawings and project requirements.
