1873K下钢液中钛脱氧平衡的热力学分析

Thermodynamics Analysis of Deoxidation Equilibrium with Ti in Liquid Steel at 1873K

基于前人的实验结果和已有的热力学数据,通过热力学计算分析了Fe-Ti-O三元系的反应产物、反应平衡常数,以及相互作用系数。计算结果表明,在炼钢过程中,Fe-Ti-O三元系中,优先生成钛氧化物;当w(Ti)<0.1时,已有的热力学数据给出的钛脱氧平衡反应曲线呈现出相似的规律(钢中w(O)随着w(Ti)的增加而减少);当w(Ti)>0.1时,钛脱氧的标准吉布斯自由能和相互作用系数采取Cha的建议值,可给出合理的结果。

Based on the previous experimental data and the existing thermodynamic data, the thermodynamic calculation was applied to analyze the chemical reaction product and the chemical reaction equilibrium constant in the Fe-Ti-O ternary system, and investigate the effect of the activity coefficients on the equilibrium for the titanium-oxygen chemical reaction. Numerical results showed that during the steelmaking process, the chemical reaction product is only titanium oxides in the Fe-Ti-O ternary system. On the base of the existing thermodynamic data, if w （Ti）〈0.1, the deoxidation equilibrium with titanium gives the similar rule （The higher Ti contents in the molten steel, the lower O contents in the molten steel）. If the standard Gibbs free energy for Ti-O chemical reaction and the related interaction parameters proposed by Cha are applied, the predicted results agree well with the experimental data.