Thermodynamic Interactions of Si and Ti in Liquid Cu

The activity coefficients of titanium in liquid Cu-Ti at 1623 and 1673 K were measured by equilibrating the liquids with Ti 3 O 5 in a oxygen partial pressure controlled by C(s)/CO(g) equilibrium. Furthermore, the thermodynamic interaction parameter of silicon on titanium and the self-interaction parameter of titanium in liquid Cu-Ti-Si at 1773 K were determined by equilibrating the 58 mass% TiO 2 -42 mass% CaF 2 slag with Cu-Si-Ti liquids. And the interaction parameters and obtained using a multiple regression were as large as −69.32 and 15.44 respectively. Based on the above determined value of , the relationship between Henrian constant of titanium in liquid Cu-Ti melt, , from 1473 to 1923 K was evaluated, and is expressed as: The Gibbs energy of dissolution of solid titanium into liquid copper relative to 1 mass% state in the temperature range from 1473 to 1923 K can be expressed as: