Deoxidation equilibria of molten nickel by Mg-Al and Mn-Al

Author： Zhao Yihong Morita Kazuki Sano Nobuo

ISSN： 1543-1916

Source： Metallurgical and Materials Transactions B, Vol.29, Iss.1, 1998-02, pp. : 197-203

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Abstract

The deoxidation equilibria of aluminum-magnesium and aluminum-manganese in liquid nickel equilibrated with Al₂O₃-saturated MgAl₂O₄ and MnAl₂O₄, respectively, were investigated in the temperature range of 1773 to 1873 K. At 1773 K, the oxygen levels could be reduced to 5.8 to 6.6 ppm with 2.5 to 10 ppm magnesium and 0.05 to 0.9 mass pct aluminum in the Ni-Mg-Al-O system, and to less than 20 ppm with more than 1.5 mass pct manganese and 30 ppm aluminum in the Ni-Mn-Al-O system. With the experimental results mainly obtained in the present work, the interaction parameters, e _Mg^Al , e _Mn^Al , e _O^Mg , e _O^Mn , and e _O^Al , and the equilibrium constants, log , log , log K _Mg(Ni), log K _Mn(Ni), and log K _Al(Ni), were estimated using a multiple regression analysis.