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Brief introduction of fused chrome corundum
Fused chrome corundum brick is made by melting aluminum oxide in electric arc furnace and casting it into a specific mold with a specific shape. After annealing and heat preservation, the required products can be obtained by diamond abrasive processing.
Parameters of fused chrome corundum
| Item | α-β Alumina | α- Alumina | β- Alumina | |
| Chemical Composition,% | Al2O3 | ≥95 | 98.5 | ≥92 |
| SiO2 | ≤0.5 | 0.4 | ≤0.5 | |
| NaO2 | 3-5 | 0.9 | 5-7 | |
| Other oxides | ≤0.5 | ≤0.2 | ≤0.2 | |
| Bulk density | g/cm3 | 3.54 | 3.94 | 3.26 |
| Cold crushing strength MPa | Mpa | ≥200 | ≥250 | ≥300 |
| Thermal expansion coefficient, 1000℃ | % | 0.7 | 0.88 | 0.65 |
| Thermal expansion coefficient, 1500℃ | % | 1.09 | 1.32 | 1.01 |
| Crystallographic Analysis % | α-Al2O3 | 40-50 | 90-95 | - |
| β-Al2O3 | 50-60 | 4-10 | ＞97.5 |
Classification of fused chrome corundum
The first is to α- Al2O3 is the main crystalline phase, which is called α Corundum bricks.
The second is based on α- Al2O3 and β- Al2O3 crystal phase is dominant, and the content is basically 1:1, α The phase content is slightly higher, which is called α-β Corundum bricks.
The third β- Al2O3 crystalline phase β Corundum bricks.