Alumina hollow sphere
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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| Project Item | Alumina hollow sphere brick | Zirconia hollow sphere 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 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.
Application: Alumina hollow sphere bricks are suitable for lining tunnel kilns, shuttle kilns, crucible furnaces, and various electric furnaces. They are widely used in metallurgy, light industry, chemical industry, ceramics, glass, electronics, and other industries.
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