Abstract:It is an important content of the research on physical chemistry of metallurgy to calculate thermodynamic properties of melts by melt thermodynamic models. The Miedema model and the computational model of action concentration were used to calculate the mixing enthalpy and activity of Fe- Si melt and these results were compared with other calculated results and experimental data. Results showed that compared with the calculated results of the computational model of action concentration, the difference between the results of the Miedema model and the experimental data was relatively smaller. The existing data of activity was needed to fit the Gibbs free energy of Fe- Si compounds before the computational model of action concentration was used to calculated the activity of silicon and iron,and the calculated results were greatly different from the experimental values. The comparison of calculated results of existing thermodynamic models showed that the accurate quantitative description of the microstructure of melts was the key to establish a thermodynamic calculation with clear physical meanings and the accurate function to predict properties of melts.
王振,章俊,王海川. 基于不同模型的硅铁熔体热力学性质计算[J]. 中国冶金, 2016, 26(6): 20-27.
WANG Zhen,ZHANG Jun,WANG Hai- chuan. Calculation of thermodynamic properties of Fe- Si melt based on different models. China Metallurgy, 2016, 26(6): 20-27.