ABSTRACT

To solve the problems of slag entrapment risk and frequent bond alarm in the field application of mould flux for high-speed thin slab continuous casting, the idea of ‘non-Newtonian fluid mould flux with shear-thinning property’ is introduced. It was found that with an increase in the Al₂O₃ content, the shear-thinning behaviour of the mould flux first increased and then decreased. The sample with 8.61% Al₂O₃ content had the strongest shear-thinning property and the lowest fluidity index, which reached 0.75. With the addition of Al₂O₃, the degree of polymerization of the mould flux molecules increased, and the relative strength of the Si–O–Al bond increased. It was found that the Al₂O₃ content has a significant influence on the ^IVAl complexes. The XPS results showed that Q³(1Al) was the structural unit most easily affected by shear stress, and the higher the content of Q³(1Al), the stronger the shear-thinning property of the mould flux.

摘要

为解决高速薄板坯连铸保护渣现场应用过程中存在夹渣风险和粘结剂频繁报警等问题，提出了“具有剪切稀化特性的非牛顿流体保护渣”的思想。发现随着Al ₂ O ₃含量的增加，保护渣的剪切变稀行为先增加后减少。_{Al 2} O ₃含量为8.61%的样品剪切稀化性最强，流动性指数最低，达到0.75。随着Al ₂ O ₃的加入，保护渣分子的聚合度增加，Si-O-Al键的相对强度增加。发现Al₂ O ₃含量对^IV Al配合物有显着影响。XPS结果表明，Q ³ (1Al)是最易受剪应力影响的结构单元，Q ³ (1Al)含量越高，保护渣的剪切稀化性越强。