Tabular corundum for fire bricks
High-purity corundum bricks have high density, stable chemical properties, and strong corrosion resistance at high temperatures. They are suitable for refractory parts used in gasifiers and industrial kilns. Fused corundum is always adopted as the aggregate of corundum bricks. However, the porosity of white corundum is high, especially since the apparent porosity can reach 8.8%. Choosing tabular corundum as part or all of the aggregate can increase the density of the fire brick.
Tabular corundum is a sintered alumina in a high-temperature shaft furnace with a peak temperature of 1950 degree. So it is called tabular alumina or tabular aluminum oxide with a tabulated shape crystal structure. Low apparent porosity, low water absorption, and high density are significant features of tabular corundum. As a result, improve the properties of the fire brick. The advantages of tabular corundum are as below:
- 1. It has superior sintering activity and improves the density of corundum fire bricks.
2. The refractory bricks made of tabular corundum have strong compressive strength at room temperature and high temperature, and improve the bending strength at room temperature and high temperature.
3. Refractory products have high bulk density, low apparent porosity, and good slag resistance and creep resistance.
4. The abrasion resistance is higher than that of ordinary corundum bricks.
5. It has good resistance to coal gasification slag, and its resistance to slag oil slag corrosion and penetration is also better than pure fused corundum brick.
6. Mixed tabular corundum aggregate to corundum brick with fused alumina can improve the thermal shock stability of prefabricated parts.
7. The creep resistance of pure tabular corundum brick is better than that of pure fused corundum brick and their composite refractory bricks.
