Thermodynamic Assessment of the Ni-Bi Binary System and Phase Equilibria of the Sn-Bi-Ni Ternary System

摘要

As a basis to understand the interfacial reaction between the Sn-Bi solder and the Ni substrate in electronic packaging,thermodynamic calculations of phase equilibria have been carried out on the binary Ni-Bi system.The Gibbs free energy of the NiBi phase has been approximated,using a three-sublattice model,and thermodynamic parameters have been evaluated,using available experimental information on phase boundaries and other related thermodynamic properties.The calculated phase diagram and thermodynamic quantities of the Ni-Bi binary system showed good agreement with the experimental data.The Sn-Bi-Ni ternary system was calculated using the thermodynamic parameters of the Sn-Bi,Sn-Ni,and Ni-Bi binary systems,and it was compared with experimental measurements.