MgO含量对CaO-Al_(2)O_(3)-TiO_(2)基连铸保护渣界面性质的影响

Effect of MgO content on CaO-Al_(2)O_(3)-TiO_(2)-based continuous casting protective slag influence of interfacial properties

高钛钢连铸生产过程中结晶器内的钢渣界面反应较为严重,易造成连浇困难、铸坯品质下降等问题。利用热丝法对3%、8%、10%三种不同MgO质量分数的保护渣接触角进行了测定,并基于此计算出表面张力和渣钢界面张力,此外结合拉曼光谱和Scigress软件模拟,从微观结构的角度分析了MgO含量与渣钢界面张力的变化规律。研究结果表明,1723 K温度下,保护渣中MgO质量分数为3%、8%、10%时,接触角为35°、36.7°、39.8°;保护渣的表面张力为516.3、523.1、525.6 mN/m;渣钢界面张力为1421、1425、1440 mN/m。MgO质量分数在8%~10%时,渣钢界面张力上升速率明显加快,导致钢渣间的界面反应减弱,使得钢渣更容易分离。

During the continuous casting process of high titanium steel,the steel slag interface reaction in the crystallizer is relatively severe,which can easily lead to problems such as difficulties in continuous casting and decreased quality of the casting billet.The contact angles of protective slag with three different MgO mass fractions,3%,8%,and 10%,were measured using the hot wire method.Based on this,the surface tension and interfacial tension were calculated.In addition,Raman spectroscopy and Scigress software simulation were combined to analyze the changes in MgO content and interfacial tension from a microstructure perspective.The results indicate that,at a temperature of 1723 K,when the MgO mass fraction in the protective slag is 3%,8%,and 10%,the contact angles are 35°,36.7°,and 39.8°;The surface tension of the protective slag is 516.3,523.1,and 525.6 mN/m;The interfacial tension between slag and steel is 1421,1425,and 1440 mN/m.When the MgO mass fraction is between 8%and 10%,the rate of increase in interfacial tension between slag and steel is significantly accelerated,leading to a weakened interfacial reaction and making it easier to separate steel slag.