Thermodynamic description of the Cu-Ni-Pb system

Jyrki Miettinen1, Vania Gandova2, Spas Georgiev2, Gueorgui Vassilev2
1Laboratory of Metallurgy, Vuorimiehentie 2K, Helsinki University of Technology, Helsinki, Finland
2Faculty of Chemistry, University of Plovdiv, Plovdiv, Bulgaria

Tóm tắt

Thermodynamic description is presented for the ternary Cu-Ni-Pb system. Optimized parameters of the sub-systems, Cu-Ni, Cu-Pb and Ni-Pb, are taken from earlier assessments and those of the ternary system are optimized in this study by using the experimental phase equilibrium and thermodynamic data. Better agreement is obtained by the present optimization. Calculated results are compared with the original experimental data to demonstrate the successfulness of this assessment. Moreover, a geometric model (general solution model) is used to estimate ternary integral molar Gibbs excess energies of the liquid phase from the bibary systems only. These values, however, disagree with the quantities obtained by thermodynamic optimizations.

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