为了向洁净钢冶炼提供一种无碳的精炼钢包渣线用材料,将MgO/Si_3N_4复合耐火材料应用于精炼钢包渣线是一项有意义的探索.借助SEM和EDAX等手段研究了MgO/ Si_3N_4复合材料在精炼钢包渣线使用后反应带和渗透带等不同部位的微观结构.结果表明,MgO/ Si_3N_4复合耐火材料具有良好的抗渣渗透性.其损毁特征是:表层氮化硅氧化造成反应层疏松,使炉渣易于侵入并形成浮游颗粒而溶损.然而氧化产物SiO_2阻塞气孔通道,阻止反应的继续进行,氧化产物SiO气体在距渣层与反应层界面约1 mm处继续氧化成SiO_2固体沉析而形成Si的富集层,生成M_2S(2MgO·SiO_2),体积膨胀,进一步阻碍渣的渗透,使得形成的渗透层较薄.不像含碳耐火材料,碳氧化为气体,反应通道将继续留下.
It is significant that using MgO/Si_3N_4 composite as a carbon free refractory of slag line in steel ladle when making clean steal. After using that refractory on slag line, the microstructure of different regions in reaction and penetration belt was studied by SEM and EDAX. The results showed that MgO/Si_3N_4 composite possess excellent resistance to slag penetrability. The wear mechanism is that Si_3N_4 on surface layer was oxedized, which made the reaction layer become loose, so the slag penetrated easily and the pelagic grain was formed which caused damage. But the oxide SiO_2 blocked the pore tunnel, which stopped the proceeding of reaction. The gas SiO was oxidized again to become SiO_2 in 1 mm to interface between slag layer and reaction layer, which made Si enrich to form M_2S. During this course, the bulk expanded which blocked the slag penetration further and made the penetration layer thin. For carbon refractory, C was oxidized to become gas and the reaction tunnel would still exist.
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