摘要
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 magnesiow＆#252;stite 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.
出处
《耐火材料》
CAS
北大核心
2015年第3期178-181,共4页
Refractories
基金
国家自然科学基金面上项目(51471002)
关键词
炼钢电弧炉
渣线
MGO-C
砖
显微结构
炉渣侵蚀
steelmaking electric arc furnace
slag line
magnesia-carbon brick
microstructure
slag corro-sion
