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Thermodynamics of oxygen and nitrogen in liquid nickel equilibrated with CaO-TiO x and CaO-TiO x -Al2O3 melts

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Abstract

Equilibrium between CaO-TiO x or CaO-TiO x -Al2O3 slags and liquid nickel with respect to oxygen and nitrogen has been studied at 1873 K as a function of Ti (or Al) content in metal, using lime and alumina crucibles. The Al-O, Ti-O, and Ti-Al relations were obtained for liquid nickel equilibrated with these slags. Nitride capacity,C (N), defined by (mass pct N) · \(\left( {\mathop O\nolimits_{2^{ \bullet ^{\text{ - }} } } } \right)\), was evaluated from nitrogen distribution ratios,L N {= (mass pct N)/[mass pct N], coupled with oxygen content in liquid nickel. Activities of Al2O3 and activity coefficients of TiO2 and TiO1.5 were estimated either from the content of Al, Ti, and O, using the compiled data for the free energy of formation of oxide and the respective interaction parameters or from the values forL N andC (N).

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Tohoku University, Sendai, Japan

    Sung-Wook Cho (Graduate Student)

  2. Institute for Advanced Materials Processing, Tohoku University, Sendai, Japan

    Hideaki Suito (Professor)

Authors
  1. Sung-Wook Cho
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  2. Hideaki Suito
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Cho, SW., Suito, H. Thermodynamics of oxygen and nitrogen in liquid nickel equilibrated with CaO-TiO x and CaO-TiO x -Al2O3 melts. Metall Mater Trans B 25, 5–13 (1994). https://doi.org/10.1007/BF02663173

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  • DOI: https://doi.org/10.1007/BF02663173

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