【摘要】 低反应性CaO-Al₂O₃基保护渣可以大幅降低高铝钢连铸过程中的渣-钢反应强度，但此类保护渣黏度较大，结晶性能较强，易在结晶器弯月面处产生较大渣圈，造成铸坯缺陷。采用分子动力学模拟方法结合黏度测试试验，解析同为碱金属氧化物的Li₂O、Na₂O和K₂O对CaO-Al₂O₃基保护渣熔体结构和黏性特性影响的异同，结果表明，碱金属氧化物对[AlO₄]^5-四面体进行电荷补偿遵循Li₂O<Na₂O<K₂O的顺序，对铝酸盐网络结构的解聚能力遵循Li₂O>Na₂O>K₂O的顺序。更多还原

【Abstract】 Low reactivity CaO-Al₂O₃ based mold flux can significantly reduce the intensity of slag-steel reaction in the continuous casting process of high-alumina steel.But the viscosity of this kind of mold flux is larger and the crystallization performance is stronger,which is easy to produce larger slag rims at the mold meniscus and cause casting defects.In this paper,the molecular dynamics simulation method combined with viscosity test experiment was used to analyze the similarities and differences of the effects of Li₂O,Na₂O and K₂O,which are alkali metal oxides,on the melt structure and viscosity properties of CaO-Al₂O₃ based mold flux.The results show that the charge compensation of[AlO₄]^5-tetrahedra by alkali metal oxides follows the order of Li₂O<Na₂O<K₂O,and the depolymerization ability of aluminate network structure follows the order of Li₂O>Na₂O>K₂O.更多还原