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Activity of chromic oxide in the CaF2−CaO−Cr2O3 and the CaF2−Al2O3−Cr2O3 systems

  • Physical Chemistry
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Abstract

The values of the activity of Cr2O3 in the slags based on the CaF2−CaO−Cr2O3 and the CaF2−Al2O3−Cr2O3 systems which may be used in the electroslag remelting (E.S.R.) process have been determined at 1450, 1500 and 1550°C by equilibrating the slags with Pt−Cr alloys of known chromium activity under known oxygen partial pressure and studying the equilibrium 2[Cr] alloy+3/2 O2(g)=(Cr2O3)slag. It was found that activity of Cr2O3 decreases with the addition of CaO and Al2O3 in the respective systems. In slags containing less than about 20 wt pct CaO and in the Al2O3 bearing slags, solutions of Cr2O3 showed a positive deviation from ideality and in slags containing more than 20 wt pct CaO, they showed a negative deviation.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Regional Engineering College, Rourkela, India

    A. K. Mohanty (Professor and Head)

  2. Department of Metallurgy and Materials Science, McMaster University, Hamilton, Canada

    D. A. R. Kay (Professor)

Authors
  1. A. K. Mohanty
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  2. D. A. R. Kay
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Additional information

Both the authors were formerly with the Department of Metallurgy, University of Sheffield, England

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Mohanty, A.K., Kay, D.A.R. Activity of chromic oxide in the CaF2−CaO−Cr2O3 and the CaF2−Al2O3−Cr2O3 systems. Metall Trans B 6, 159–166 (1975). https://doi.org/10.1007/BF02825690

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  • DOI: https://doi.org/10.1007/BF02825690

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