THERMODYNAMICS OF Cu-Ce-I (I=Al, Si, Ti, Fe) LIQUID SOLUTIONS
(1.Central Iron and Steel Research Institute, Being 100081, China;
2.Northeast University of Technology，Shenyang 110006, China)
2.Northeast University of Technology，Shenyang 110006, China)
Abstract: The iso-activity of [Ce] of samples reached in multiple-hole-graphite crucibles by controlling the oxygen potential through the reaction 2[Ce]+3CO=Ce2O3+3C. Combining conjugate gradient method of solving ill-conditioned equations, the activity interaction coeffients between Ce and Al, Si> Ti and Fe alloying elements were determined. The equilibrium constant of the reaction 2[Ce]+3[O]=Ce2O3 and the standard free energy of formation of Ce2O3 in liquid Cu were obtained at 1,200℃.
Key words: iso-activity interaction coefficient Cu-Ce-A1 Cu-Ce-Si Cu-Ce-Ti Cu-Ce-Fe equilibrium constant standard free energy of formation