Aluminum Deoxidation Equilibrium of Molten Fe–Ni Alloy Coexisting with Alumina or Hercynite

• Published in: ISIJ International Vol. 48; no. 11; pp. 1533 - 1541
• Main Authors: Hayashi, Atsutaka, Uenishi, Takayuki, Kandori, Hirotoshi, Miki, Takahiro, Hino, Mitsutaka
• Format: Journal Article
• Language: English
• Published: Tokyo The Iron and Steel Institute of Japan 01.01.2008; Iron and Steel Institute of Japan
• Subjects: activity; alumina; aluminum deoxidation equilibrium; Applied sciences; Exact sciences and technology; excess free Gibbs energy; hercynite; iron; iron–nickel alloy; Metals. Metallurgy; nickel; quadratic formalism; Redlich–Kister polynomial; thermodynamics; Redlich-Kister polynomial; Thermodynamics; hercynite; nickel; iron-nickel alloy; excess free Gibbs energy; activity; quadratic formalism; aluminum deoxidation equilibrium; iron; Alumina; Free energy
• ISSN: 0915-1559; 1347-5460
• DOI: 10.2355/isijinternational.48.1533

Aluminum deoxidation equilibrium of molten Fe–Ni alloy was determined by chemical equilibrium method at temperature of 1873 to 1973 K. Also, critical point in molten Fe–40mass%Ni alloy that coexisted with Al2O3 and FeO·Al2O3 was determined experimentally at 1973 K. Solvent extraction method was applied to improve the analytical accuracy of the low aluminum content in molten Fe–Ni alloy. The relation between aluminum and oxygen contents in molten Fe–Ni alloy equilibrated with Al2O3 or FeO·Al2O3 was estimated in the whole alloy composition range at 1873 to 1973 K by utilizing the metallic solution model based on Darken's quadratic formalism and Redlich–Kister type polynomial.