THERMODYNAMICS OF OXYGEN SOLUTIONS AT COMPLEX DEOXIDATION OF THE Fe-Co MELTS
https://doi.org/10.17073/0368-0797-2014-5-33-41
Abstract
A method for thermodynamic analysis of complex deoxidation process of metallic melts is proposed. This method allows to determine the effect of a weaker element-deoxidizer on increasing deoxidizing ability of a stronger element-deoxidizer. Oxygen solubility curves pass through a minimum. Analysis of the equation of dependence of the concentration of oxygen in the melt on the elements-deoxidizers contents for the presence of extremum possible to obtain an equation for determining the content of a stronger element-deoxidizer, wherein the oxygen concentration is the lowest. A thermodynamic analysis of the joint infl uence of aluminum and silicon on the solubility of oxygen in the melts of Fe – Co system has been performed. Deoxidation reaction products may be formed as mullite (3Al2O3·2SiO2 ) and kyanite (Al2O3·SiO2 ). The presence of silicon in the melt enhances the deoxidizing ability of aluminum: insignificantly in the case of formation of compound 3Al2O3·2SiO2 and significantly in the case of formation of compound Al2O3·SiO2 . Oxygen solubility curves in the case of formation of compound Al2O3·SiO2 pass through a minimum, the position of which depends on the content of aluminum in the melt and is not dependent on the silicon content. The aluminum content in the minimum points is insignificantly reduced from iron to cobalt as in the case of melts of Fe – Co – Al. Further additives are aluminum leads to an increase in oxygen concentration. Areas of compounds Al2O3 , 3Al2O3·2SiO2 , Al2O3·SiO2 and SiO2 depending on aluminum and silicon contents in the melt are determined.
About the Authors
V. Y. Dashevskij
Institute of Metallurgy and Materials Science named after Baykov A.A. (Moscow, Russia)
Russian Federation
Russian Federation
Dr. Eng., Head of the Laboratory A.A. Aleksandrov, Cand. Eng., Senior Researcher
L. I. Leontiev
Institute of Metallurgy and Materials Science named after Baykov A.A. (Moscow, Russia)
Russian Federation
Russian Federation
RAS Academician, Chief Scientist
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Review
For citations:
Dashevskij V.Y., Leontiev L.I. THERMODYNAMICS OF OXYGEN SOLUTIONS AT COMPLEX DEOXIDATION OF THE Fe-Co MELTS. Izvestiya. Ferrous Metallurgy. 2014;57(5):33-41. (In Russ.) https://doi.org/10.17073/0368-0797-2014-5-33-41
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