ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Effect of Fe Addition on the Activity Coefficient of Si in Cu–Fe–Si Melt at 1623 K
Yuichi KatoTakeshi Yoshikawa Yutaka KagawaKazuki Morita
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2013 Volume 53 Issue 8 Pages 1320-1324

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Abstract

The activity coefficient of Si in Cu–Si alloy and Cu–Si–Fe alloys was determined using three principles at 1623 K. Cu–Si(–Fe) alloys at a low Si concentration were equilibrated with SiO2 in a graphite crucible under a controlled CO partial pressure. Cu–Si(–Fe) alloys at a medium Si concentration were equilibrated with SiC in a graphite crucible. And finally, Cu–Si(–Fe) alloys at a high Si concentration were equilibrated in a Si3N4 crucible under a controlled partial pressure of N2. The activity coefficients of the alloys were calculated based on the equilibrium Si concentration. The results show that the activity coefficient of Si in Cu–Si–Fe alloy decreases with an increase in the concentration of Fe. The results were evaluated in terms of the interaction parameters in molten Cu for Wagner’s formalism, and the interaction coefficient in the concentrated solution.The evaluated thermodynamic properties of Cu–Si–Fe alloy indicated that the addition of Fe to Cu–Si alloy is effective in decreasing the activity of Si in the alloy.

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© 2013 by The Iron and Steel Institute of Japan
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