Thermodynamic Assessment of Tin Based Molten Binary Indium-Tin Solder Alloys

It has been focused to develop the lead free solder alloy by substitute the In in place of Pb in Sn-Pb alloy to reduce the harmful effect of lead in conventional Pb-Sn solder alloy. For development of alloy depend on its thermo dynamical properties. In this study, integral enthalpies of mixing for the molten binary In-Sn system at 757, 809, and 845 K were obtained using a drop calorimeter spanning the whole indium range. Automated motorized dropping equipment was used to drop the element. Then, four pieces of α-Al2O3 were dropped at the falling temperature to calibrate the calorimeter. When the integral mixing enthalpies were compared to the composition, it was discovered that all compositions were exothermic. At xIn ~ 0.55, there was a discernible minimum enthalpy of mixing. There is a small degree of temperature dependence. The enthalpy of mixing was utilised to derive the binary interaction parameters using the Redlich-Kister polynomial. The experimental results are contrasted with the estimated results obtained using the Redlich-Kister polynomial. Its show that they were substantially in good agreement.