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Breathable brick types and advantages and disadvantages[08/16/2021]
The materials of breathable fire bricks are mainly sintered magnesia, magnesia chromium, high aluminum and corundum.
1. Sintered magnesia breathable brick
Sintered magnesia material refers to a refractory material with a MgO content of more than 80%. It is an alkaline refractory material. It has high refractoriness and strong resistance to alkaline slag erosion, but its thermal expansion coefficient is large and thermal shock resistance is poor, making the material easy to peel off , Which greatly reduces the service life of magnesia refractories.
2. Magnesium chromium breathable brick
Magnesium chromium material is a refractory material with MgO and Cr2O3 as the main components, and periclase and pinnite as the main mineral components. Because chrome ore is not inert to steelmaking slag and is compatible with other refractory materials, the emergence of magnesia-chromium materials has greatly improved the thermal shock resistance of magnesia materials.
3. High-aluminum breathable brick
High-aluminum materials refer to refractory materials with Al2O3 content greater than 48%, which have the characteristics of high cold and hot strength, good wear resistance, heat shock resistance, peeling resistance and good volume stability at high temperatures. However, its resistance to slag erosion and penetration is not good enough to resist the infiltration and penetration of bricks by molten slag during the entire package service.
4. Corundum breathable brick
Corundum material refers to a refractory material with an Al2O3 content of more than 90%. Corundum is made of industrial alumina or bauxite after sintering or electrofusion.
To realize the argon blowing process at the bottom of the ladle breathable brick, the ladle breathable brick must have good high temperature resistance, corrosion resistance, thermal shock resistance, high temperature volume stability and high strength, good air permeability, stable operation, accurate shape and size, and less molten steel penetration Features.