Thermodynamic Study of Sn-Ag-Ti Active Filler Metals

The activity of Titanium (Ti) influences the interface reactions and plays an important role in wettability and connectivity between filler metals and ceramics. Based on thermodynamics, the relations between the activity of Ti and the components concentration in Sn-Ag-Ti alloys are discussed. The interaction parameters of each component are calculated. Analysis and calculations show the interaction parameters of Sn-Ag, Sn-Ti, and Ag-Ti are -2.17KJ/mol, 23.85KJ/mol and 8.69KJ/mol, respectively in the Sn-Ag-Ti alloys at 723K. Furthermore, the thermodynamic activity of Ti increases as Ti content increased from 0 to 2 wt.% at various Ag content in the alloys solution at 723K. As the content of Ti remains unchanged, the activity of Ti increased with the increase Ag content in the alloys solution at 723K. However, the trend toward increasing the activity of Ti gradually decreased.