The decarbonization behavior of various refractories which havereacted with molten steel at 1560℃ under argon atmosphere was investigated.The Al2O3-C decarbonization occurred only on the hot face and is concludedto be caused by the dissolution of graphite into the molten steel. In thecase of MgO-C, a dense MgO layer was produced on the hot face and the grainsof original graphite and MgO became samller or disappeared in the interiorside. the decarbonization was caused by the reaction between graphite andMgO and further decarbonization was prevented after the dense MgO layer wasproduced by the reaction Mg(g) and O or CO(g). In the case of ZrO2-C orCaO-ZrO2-C, a thick decarbonization zone was formed and a few large metalskulls including many graphite strips existed in the zone. The decarbonizationmechanism can be explained by the dissolution of graphite into metal skullswhich were the molten steel penetrated into the pores in the refractory. Thepenetration may be caused by the good wettability of ZrC around the ZrO2 orCaO·ZrO2 particles in the refractory with the molten steel. The ZrC was formedby the reaction between graphite and ZrO2.Keywords:Molten steel, Graphite Containing Refractories, Al2O3-C, MgO-C,CaO-ZrO2-C, Decarbonization, Reaction, Wetting, Penetration, Metal skull.
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