碱度对CaO-SiO_2-CaF_2-Na_2O四元渣系结晶临界冷却速度和孕育时间的影响  

Influence of Basicity on Critical Cooling Rate and Incubation Time of CaO-SiO_2-CaF_2-Na_2O Quartemary Slag System

作　　者：刘慧[1] 文光华[1] 唐萍[1] 

机构地区：[1]重庆大学材料科学与工程学院冶金系,重庆400044

出　　处：《过程工程学报》2008年第S1期266-270,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金(编号:50574109)

摘　　要：采用热丝法构建CaO-SiO_2-CaF_2-Na_2O四元渣系的连续冷却转变(Continuous Cooling Transformation,CCT)和等温转变(Temperature Time Transformation,TTT)曲线.实验结果表明,碱度越高,保护渣临界冷却速度越大,碱度1.5的渣样临界冷却速度达20℃/s.等温实验X射线衍射结果显示,低碱度渣样在高温区析出硅灰石(CaO·SiO_2),高渣样析出硅酸二钙[Ca_2(SiO_4)],后者导热系数低,控制传热效果更好.随碱度增加,保护渣TTT曲线鼻尖点孕育时间缩短,动力学分析可用推导方程描述渣的等温结晶过程.对裂纹敏感性钢种,CaO-SiO_2-CaF_2-Na_2O四元渣系保护渣碱度可达1.5.Continuous cooling transformation(CCT)and temperature time transformation(TIT)diagrams of CaO-SiO_2-CaF_2-Na_2O quartemary slags by single hot thermocouple technique(SHTT)was constructed to measure the influence of basicity on the critical cooling rote and incubation time of mold slags.The results indicate that slags have larger critical cooling rate with basicity increasing, and that of basicity 1.5 slag is 20℃/s.The crystal phase precipitated at higher temperature of low basicity slag analyzed by X-ray di...

关 键 词：临界冷却速度 孕育时间 连续冷却转变 等温转变 

分 类 号：TF777[冶金工程—钢铁冶金]