A Calorimetric Study of Heats of Mixing of Liquid Iron Alloys

Abstract

An isoperibol calorimeter used at steelmaking temperatures has been developed to measure the heat of mixing of liquid binary iron alloys (Fe-Co, Fe-Ni, Fe-Cu, Fe-Si and Fe-FeS). The experimental errors were less than ±15% for the values obtained.Heats of mixing in Fe-Co, Fe-Ni and Fe-Si were exothermic and their maximum values were -610, -1150 and -9000 cal/g·atom respectively. Mixing of Fe-Cu and Fe-FeS systems was an endothermic reaction having the maximum heats of 2400 and 1200 cal/g·atom respectively.The partial molar heats of mixing in these systems have been evaluated from the integral heats obtained in the present work by the assumption of f (XB)-functions.