为了研究 MgO－C 砖在电弧炉实际冶炼条件下的侵蚀机制，采用扫描电镜和能谱仪分析了炼钢电弧炉渣线部位用后 MgO－C 砖的显微结构。结果显示：用后 MgO－C 砖可分为渣层、镁砂层、脱碳层、原质层；渣层中有大量类球形颗粒出现，其主要成分是镁浮氏体和钙镁硅酸盐；镁砂层的镁砂颗粒被炉渣由外而内逐渐溶解，或因炉渣不断渗入镁砂颗粒的晶界而解体；在靠近原质层的脱碳层区域，有氧化铁被石墨还原生成的大量铁珠。据此认为，炼钢电弧炉渣线部位 MgO－C 砖的侵蚀机制为：电炉渣中的氧化铁首先氧化了石墨，然后炉渣不断侵蚀镁砂颗粒，使其溶解或解体形成小颗粒。
The microstructure of used MgO-C bricks in EAF slag line was investigated by using SEM-EDS to study the corrosion mechanism.The results show that the used MgO-C bricks can be divided into slag layer,MgO layer,decarburization layer and original layer;there are large quantities of ball-shaped particles in the slag layer,which are composed of magnesiowüstite and calcium -magnesium silicates;magnesia particles in MgO layer are dissolved by the slag gradually from outside in,or decomposed along with the EAF slag penetration into grain boundaries;FeO is reduced into iron droplet by graphite in decarburization layer close to original layer.The damage mechanism of MgO-C bricks is analyzed to be the oxidation of graphite by FeO in slag followed by dissolution and decomposition of MgO particles under the effect of slag.
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