Decarburized zone refers to the zone formed after the surface of carbon containing refractories is eroded by oxidizing medium and the carbon is oxidized during high temperature use. The porosity of the decarburized layer is significantly higher than that of the original brick, so the strength is reduced. After being eroded by molten slag, carbon containing refractories are often attached with a slag layer on the working face, which is mainly composed of slag and refractories corroded or washed by the slag. Next to the slag layer is the reaction layer formed by the interaction between the molten slag and the decarburized refractory. In the reaction layer, the liquid phase generated by the interaction forms a continuous mass. The grains or particles of the refractory are generally in an eroded state and surrounded by these matrices. The decarburization layer is between the reaction layer and the original brick. The decarburization layer is generally thin and the reaction layer is thicker.
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