中间包微孔MgO耐火材料与钢液反应行为

摘要：为了评估新型中间包微孔MgO耐火材料与钢液的反应性，系统测定了不同钢液与微孔MgO耐火材料表观接触角，研究了界面化学反应产物以及钢中夹杂物组成的变化。结果表明：含硫钢在微孔MgO耐火材料上铺展性最好，帘线钢次之，模具钢最差，主要是表面活性元素S降低了钢液表面张力所致；熔钢与耐火材料的界面行为中既包含了物理渗透又包含了化学反应。当界面处镁蒸气压极低时，一定的硅含量能导致MgO耐火材料被还原，界面处形成了大量镁橄榄石，从而降低了微孔MgO耐火材料的化学稳定性。钢液与耐火材料界面处的产物在很大程度上影响了钢中夹杂物组成，导致了夹杂物成分的改变。

Reaction behavior of tundish microporous MgO refractory with molten steels

In order to understand the reactivity between microporous MgO refractory and various molten steels, the apparent contact angles between microporous MgO refractory and molten steels were measured systematically, and the reaction products at the interface and the composition of inclusions in the steels were studied. The results show that the spreadability of the molten steels on the microporous MgO refractory appeared in the following order of sulfur containing steel, cord steel and die steel, due to the decrease of surface tension of the molten steel with sulphur. The interfacial behavior between the molten steels and the refractory includes both physical penetration and chemical reactions. When the magnesium vapor pressure at the interface is very low, a certain content of silicon can lead to the reduction of MgO refractory, and a large amount of forsterite is formed at the interface, which weakens the chemical stability of the microporous MgO refractory. The products at the interface between the refractory and the molten steels significantly affect and change the composition of inclusions in the steels.