Alumina hollow sphere brick
Alumina hollow sphere bricks have characteristics such as high temperature resistance, low density, low heat capacity, low thermal conductivity, and strong insulation. They can improve the thermal efficiency of kilns, shorten production cycles, reduce furnace weight, and lower energy consumption, making them excellent insulating materials.
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Aluminum
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| Item | Alumina bubble brick | Zirconia bubble brick | ||
| 85 brick | 90 brick | 99 brick | 98 brick | |
| Maximum use temperature ℃ | 1680 | 1700 | 1800 | 2200 |
| Al2O3 % | ≥85 | ≥90 | ≥99 | |
| ZrO2 % | ≥98 (including stabilizer) | |||
| SiO2 % | ≤15 | ≤8 | ≤0.2 | ≤0.2 |
| Fe2O3 % | ≤0.2 | ≤0.2 | ≤0.2 | ≤0.2 |
| Bulk density g/cm³ 3 Bulk density | 1.4-2.0 | 1.4-2.0 | 1.4-2.0 | ≤3.0 |
| Cold compression strength MPa | 8-35 | 8-35 | 8-35 | ≥8 |
| Load softening start temperature ℃ (0.1MPa, 0.6%) Refractoriness under load |
≥1650 | ≥1700 | ≥1700 | ≥1700 |
| Reheating linear change rate % (1600℃×3h) Reheating linear change |
±0.4 | ±0.3 | ±0.3 | ±0.2 |
| Thermal conductivity w/(m·k) (Average temperature 800℃) Thermal Conductivity |
0.8-2.0 | 0.7-1.9 | 0.6-1.8 | ≤0.3 |
Performance: Alumina bubble brick features high temperature resistance, low density, low heat capacity, low thermal conductivity, and strong insulation, which can improve kiln thermal efficiency, shorten production cycles, reduce furnace weight, and lower energy consumption. It is an excellent insulating material.
Application: Alumina bubble brick is suitable for linings of tunnel kilns, shuttle kilns, crucible furnaces, and various electric furnaces. It is widely used in metallurgy, light industry, chemical industry, ceramics, glass, electronics, and other industries.
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