Magnesia-chrome brick is a high-performance basic refractory brick produced from high-purity magnesia and chrome ore as the main raw materials. It is manufactured through high-temperature firing, forming a direct bond between periclase and chrome spinel crystals, resulting in high bonding strength and a compact microstructure.
The main difference between direct-bonded magnesia-chrome bricks and rebounded magnesia-chrome bricks lies in the raw materials and manufacturing processes.
High high-temperature strength and good structural stability.
Excellent resistance to slag corrosion and penetration.
Good thermal shock resistance.
Stable volume with minimal permanent linear change during heating.
Long service life under severe high-temperature conditions.
Widely used in key parts of glass melting furnaces, non-ferrous metal smelting furnaces, cement rotary kilns, refining furnaces, and other high-temperature furnaces operating under severe corrosive conditions.
Type | Unit | CTMC12 | CTMC9B | CTMC9A | CTMC6 | CTMC4 | |
Density ≥ | kg/m3 | 3.0 | 2.98 | 2.98 | 2.95 | 2.93 | |
Apparent Porosity ≤ | % | 19 | 19 | 19 | 18 | 18 | |
Cold crushing strength ≥ | MPa | 35 | 40 | 40 | 40 | 40 | |
0.2MPa,T0.6Refractoriness under Load ≥ | ℃ | 1580 | 1580 | 1600 | 1600 | 1600 | |
Thermal Shock Resistance (950℃ Water Quenching) ≥ | times | 80 | 80 | 80 | 80 | 80 | |
Chemical Compoaition | MgO ≥ | % | 60 | 70 | 70 | 75 | 80 |
SiO₂ ≤ | % | 3.2 | 3.0 | 2.8 | 2.8 | 2.5 | |
Cr2O3≥ | 12 | 9 | 9 | 6 | 4 | ||