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Magnesia carbon brick
  • Magnesia carbon brick

Magnesia carbon brick

Mainly used for converter, AC arc furnace, DC arc furnace lining, ladle slag line and other parts.

Key words:

Clay brick, high alumina brick, magnesia carbon brick



Magnesia carbon bricks are made of high melting point alkaline oxide magnesium oxide and high melting point carbon materials that are difficult to be infiltrated by slag as raw materials, and various non-oxide additives are added. A non-burning carbon composite refractory material combined with a carbonaceous binder. Magnesia carbon bricks appeared in the early 1970 s. First, they were used in high-power electric furnaces, then in converters and refining furnaces outside the furnace, and achieved good results. Thus, the effect of the combination of graphite, carbon materials and high-temperature refractory oxides was recognized. Poor fracture toughness, high temperature spalling, and poor slag penetration resistance are the shortcomings of high temperature fired refractory products. The emergence of carbon-containing refractory products has broken through these weaknesses. Magnesium oxide and graphite in magnesia-carbon bricks are wrapped around each other, which is not the so-called sintering in the traditional concept. Graphite has the characteristics of high thermal conductivity, low elastic modulus, small thermal expansion coefficient, and is not easy to be infiltrated by slag. Therefore, due to the introduction of graphite, the fracture toughness and slag permeability resistance of furnace lining refractory products are essentially improved. The main feature of magnesia-carbon bricks is the formation of carbon bonds on the microstructure, which are formed by the coking and carbonization of organic binders at high temperatures.

Magnesia-carbon brick, as a composite refractory material, effectively utilizes the strong slag erosion resistance of magnesia and the high thermal conductivity and low expansion of carbon to compensate for the poor spalling resistance of magnesia.

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