Chrome corundum bricks boast superior corrosion resistance due to their unique Al2O3/Cr203-solid crystal makeup. With an increase in Cr2O3 content, these bricks exhibit enhanced resistance to corrosion. Simultaneously, they offer notable wear resistance, exceptional thermal shock resilience, and a minimized creep rate.
Chrome corundum bricks are a top-choice for industries requiring optimal corrosion resistance, as Cr2O3 is the most corrosion-resistant refractory oxide for molten glass applications, particularly beneficial for mineral wool glass, insulating glass, colored and special glasses, as well as ceramic frit glaze. Key components like over-coating tiles, regenerator chimney blocks, port necks, target walls, superstructures, doghouse corners, and discharging holes benefit greatly from these bricks.
Chrome Corundum Bricks are highly valued in the glass industry for their exceptional performance in high-temperature environments and superior resistance to slag and molten glass corrosion. These bricks primarily consist of a solid solution of Al2O3 (alumina) and Cr2O3 (chromium oxide), providing robust structural integrity and longevity.
Key Features and Benefits:
High Corrosion Resistance: Chrome Corundum Bricks exhibit outstanding resistance to the corrosive effects of molten glass and slag, significantly outperforming traditional refractory materials. The presence of Cr2O3 enhances their durability, making them ideal for critical areas in glass furnaces.
Thermal Stability: These bricks maintain excellent stability under high temperatures, which is crucial for preserving the structural integrity of glass furnaces during prolonged use.
Application in Glass Furnaces: Chrome Corundum Bricks are particularly effective in the high-stress areas of glass furnaces, such as the feed inlet, furnace bottom, throat, and regenerator checkers. Their use can extend the operational life of furnaces by providing enhanced resistance to wear and corrosion.
Chrome Corundum Bricks are renowned for their high temperature resistance and excellent slag corrosion resistance, particularly against molten cinders, outperforming low silicon corundum bricks. These bricks typically contain Cr2O3, with their primary mineral composition being an Al2O3-Cr2O3 solid solution.
Initially, Chrome Corundum Bricks appear green due to the presence of chrome green in the corundum. However, after undergoing high-temperature sintering, their appearance changes to red or sometimes even purple-red due to the reaction with CO.
The color of Chrome Corundum Bricks depends on the percentage of chromium oxide (Cr2O3) present:
3% Chromium Oxide: Light red color
8% Chromium Oxide: Purplish-red color
More than 20% Chromium Oxide: Black and red color
The higher the percentage of chromium oxide, the darker the color of the brick.
| Grade | Cr2O3 % | Al2O3 % | ZrO2 % | Bulk Density g/cm3 | Apparent Porosity % | Cold Crushing Strength MPa | Refractoriness Under Load ˚C (0.2MPa, 0.6%) | Thermal Shock Resistance times |
| CC-10 | ≥10 | ≥85 | >3.25 | <17 | >100 | ≥1700 | >10 (Air) | |
| AZC-10 | ≥10 | >70 | >6 | >3.15 | <17 | >100 | ≥1700 | >10 (Water) |
| CC-13 | ≥13 | ≥80 | ≥3 | ≥3.3 | ≤15 | >100 | ≥1700 | |
| CC-15 | ≥15 | ≥75 | ≥3.5 | ≥3.3 | ≤15 | >100 | ≥1700 | |
| CC-30 | ≥30 | >50 | >5 | >3.45 | <18 | ≥120 | ≥1700 | |
| CC-50 | ≥50 | 40 | 4 | ≥3.5 | ≤16 | ≥120 | ≥1700 | |
| CC-60 | ≥60 | 28 | 5 | ≥3.6 | ≤15 | ≥130 | ≥1700 | |
| CC-70 | ≥70 | 13 | 4 | ≥3.6 | ≤16 | ≥120 | ≥1700 | |
| MC-80 | ≥80 | 3 | 8 | ≥3.7 | ≤16 | ≥120 | ≥1700 | |
| HC93 | ≥93 | – | 2 | ≥4.25 | ≤16 | ≥100 | ≥1700 |
