CAJ | 학술논문

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.
위료향길정강야련제공일충무탄적정련강포사선용재료,장MgO/Si_3N_4복합내화재료응용우정련강포사선시일항유의의적탐색.차조SEM화EDAX등수단연구료MgO/ Si_3N_4복합재료재정련강포사선사용후반응대화삼투대등불동부위적미관결구.결과표명,MgO/ Si_3N_4복합내화재료구유량호적항사삼투성.기손훼특정시:표층담화규양화조성반응층소송,사로사역우침입병형성부유과립이용손.연이양화산물SiO_2조새기공통도,조지반응적계속진행,양화산물SiO기체재거사층여반응층계면약1 mm처계속양화성SiO_2고체침석이형성Si적부집층,생성M_2S(2MgO·SiO_2),체적팽창,진일보조애사적삼투,사득형성적삼투층교박.불상함탄내화재료,탄양화위기체,반응통도장계속류하.
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.