About magnesia carbon brick damage mainly from two aspects of slag chemical attack and physical penetration to consider, and in different metallurgical reactors, because of the different operating process and slag composition, the erosion mechanism of magnesia carbon brick is not the same, because the steelmaking converter of furnace protection by slag splashing technology on the basic, so on the furnace life of converter are above all furnace, steel-making furnace and refining ladle lining erosion is in serious condition. For the erosion behavior of magnesia-carbon brick in slag, carbon oxidation and magnesium oxide dissolution are the main factors.
The damage process of magnesia-carbon brick can be summarized as oxidation, decarburization, loosening, erosion, scour, shedding and damage. First working face of magnesia carbon brick form graphite oxidation decarburization layer, the decarburized layer of magnesia in thermal stress (graphite and sintered at 1000 ℃, the thermal expansion rates were 1.4% and 0.2% respectively), chemical erosion and mechanical erosion conditions gradually eroded off, fall off suddenly and violently leak after graphite, continue to be oxidation decarburization layer formation, and then to the magnesia dissolution process, under the effect of repeated, cause the damage of magnesia carbon brick.
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