Magnesia-carbon bricks are made of fused magnesia (sintered magnesia) flake graphite (mainly crystallized graphite) as raw materials, using resin as a binder to prepare press, heat treatment.
In order to improve the oxidation resistance, antioxidants such as metals are often added. Magnesia-carbon bricks form a carbon skeleton bond when used at high temperatures. Because magnesium oxide carbon do have a mutual solubility relationship, the ramming material retains the excellent fire resistance of the original components. Carbon has good thermal conductivity, low thermal expansion coefficient low elasticity coefficient, which can effectively prevent high-temperature spalling slag penetration, is prone to structural spalling, which greatly changes the fatal weakness of degraded structure spalling caused by slag penetration of magnesia refractories. Coupled with the non-wetting of carbon to slag, the corrosion resistance is also good.
These series of characteristics of magnesia carbon brick make it an ideal charge material with good thermal shock resistance, erosion resistance spalling resistance. Magnesia-carbon bricks are widely used, can be used in key parts of thermal equipment such as steel-making converters, electric arc furnaces, ladles, refining furnaces outside the furnace.