The main types of corundum bricks include white corundum bricks, chrome corundum bricks, zirconium corundum bricks, brown corundum bricks, zirconia bricks, etc. It is a high-quality refractory material, and Rongsheng Refractory Materials Manufacturer has a clear distinction between white corundum bricks and chrome corundum bricks.
- Composition
The main component of white corundum brick is alumina, with a content of more than 90%. It is a refractory product with corundum as the main crystal phase. In addition to alumina as a raw material, chrome corundum bricks also add Cr2O3 raw materials, and are then made by high-pressure molding and high-temperature sintering.
- Refractory resistance
The refractoriness of white corundum bricks can reach about 1600℃, while the refractoriness of chrome corundum bricks can reach 1790℃. In terms of refractoriness, chrome corundum bricks are better than white corundum bricks.
- Compressive strength
The compressive strength of white corundum bricks is generally between 70-100Mpa, while the compressive strength of chrome corundum bricks can reach about 120Mpa. It can be seen that the compressive strength of the latter is better than that of the former.
- Resistance to slag erosion
The apparent porosity of white corundum bricks is generally around 20%, while the apparent porosity of chrome corundum bricks is generally around 15%. Therefore, it can be seen that in high-temperature environments, white corundum bricks are more likely to be corroded by molten slag. In actual use, the chemical corrosion and permeability of chromium corundum refractory bricks against gasified slag is better than that of white corundum refractory bricks.
- Thermal shock resistance
During the experiment, as the Cr2O3 content in chromium corundum bricks increased, the thermal shock stability decreased. The thermal shock resistance of chrome corundum bricks with a Cr2O3 content between 12% and 20% is better than that of white corundum bricks. In other cases, the thermal shock resistance of white corundum bricks is better.
- Purpose
Chrome corundum bricks are used in glass kiln linings, molten iron pretreatment devices, waste incinerators, gasifier linings, etc. White corundum bricks are used in various high-temperature kiln linings, such as cracking and reforming furnaces in the petrochemical and fertilizer industries, steelmaking furnaces, and blast furnaces in the metallurgical industry. Both products have their own advantages, but chrome corundum bricks have stronger high-temperature resistance and corrosion resistance than corundum refractory bricks.
The difference between white corundum bricks and chrome corundum bricks allows them to play different roles in different environments and process requirements. In the actual use process, we have to choose according to the actual use needs. Only in this way can the overall service life of the kiln and its stability during use be improved.
RS Refractory Manufacturer 