CaO-SiO_(2)-Al_(2)O_(3)-Na_(2)O-MgO系模铸保护渣微观结构解析  

Microstructure Analysis of Mold Flux of CaO-SiO_(2)-Al_(2)O_(3)-Na_(2)O-MgO System for Ingot Casting

作　　者：王震[1,2] 姜茂发 刘承军[1,2] 闵义 WANG Zhen;JIANG Mao-fa;LIU Cheng-jun;MIN Yi(Key Laboratory for Ecological Metallurgy of Multimetallic Ministry(Ministry of Education),Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China;State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114021,China)

机构地区：[1]多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819 [2]东北大学冶金学院,辽宁沈阳110819 [3]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114021

出　　处：《东北大学学报（自然科学版）》2023年第4期517-523,共7页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51974075).

摘　　要：为明晰化学成分变化对模铸保护渣物性的影响机制,采用Raman光谱对CaO-SiO_(2)-Al_(2)O_(3)-Na_(2)O-MgO系熔融模铸保护渣的微观结构进行了解析.熔体结构解析结果表明,熔渣中存在Q_(Si)^(0),Q_(Si)^(1),Q_(Si)^(2),Q_(Si)^(3),Q_(Si)^(4)五种硅氧四面体结构和Q_(Al)^(2),Q_(Al)^(3),Q_(Al)^(4)三种铝氧四面体结构,随着碱度升高和Al_(2)O_(3)质量分数减小,高聚合度四面体结构向低聚合度转变,熔渣非桥氧数增多,聚合程度降低.物理性质测试结果表明,黏度随Al_(2)O_(3)质量分数增大而升高,随碱度的升高而降低;表面张力随Al_(2)O_(3)质量分数的增大而减小,随碱度的升高而增大,这与熔渣微观结构转变行为相符.探讨了渣金界面反应对模铸保护渣微观结构、物理性质及卷渣行为的影响.In order to clarify the influence mechanism of chemical composition change on physical properties of mold flux for ingot casting,the microstructure of CaO-SiO_(2)-Al_(2)O_(3)-Na_(2)O-MgO system slags were analyzed via Raman spectroscopy.The melt structure analysis results showed that there are five silicon oxygen tetrahedral structures Q_(Si)^(0),Q_(Si)^(1),Q_(Si)^(2),Q_(Si)^(3)and Q_(Si)^(4)and three aluminum oxygen tetrahedral structures Q_(Al)^(2),Q_(Al)^(3)and Q_(Al)^(4)in the slag.With the increase of basicity and the decrease of Al_(2)O_(3)mass fraction,the tetrahedral structure with high degree of polymerization changes to low degree of polymerization,the number of non bridging oxygen in the slag increases and the degree of polymerization decreases.The physical property test results showed that the viscosity increases with the increase of Al_(2)O_(3)mass fraction and decreases with the increase of basicity.The surface tension decreases with the increase of Al_(2)O_(3)mass fraction and increases with the increase of basicity,which is consistent with the microstructure transformation behavior of slag.The effects of slag metal interfacial reaction on the microstructure,physical properties and behavior of slag entrapment are discussed.

关 键 词：保护渣 模铸 微观结构 拉曼光谱 物理性质 

分 类 号：TF4[冶金工程—钢铁冶金]