Activities of the constituents in spinel solid solution and free energies of formation of MgO, MgO·Al2O3

Katsumori Fujii, Tetsuya Nagasaka, Mitsutaka Hino

Research output: Contribution to journalArticlepeer-review

137 Citations (Scopus)

Abstract

Spinel (MgO·Al2O3) is known as one of the most harmful non-metallic inclusions in steel. However, the technology to avoid spinel formation has not yet been established due to lack of thermodynamic information on the spinel itself. In the present work, the free energies of formation of MgO and MgO·Al2O3, and the activities of the constituents in spinel solid solution have been directly measured by the chemical equilibrium technique. The free energies of formation of MgO and MgO·Al2O3 determined in the present work are expressed by the following equation: Mg(l)+1/2 O2(g) = MgO(s) ΔGf,MgOo = -669 350+135.0T (J/mol) Al2O3(s)+MgO(s) = MgO·Al2O3 (s) ΔGf,MgO·Al(2)O(3)o = -20 790-15.7T (J/mol) The activity of stoichiometric MgO·Al2O3 exhibits negative deviation from ideality in the spinel solid solution. Phase stability diagram of spinel formation in liquid steel was assessed as a function of aluminum, magnesium and oxygen contents in iron at 1 873 K. The predicted phase boundaries of MgO·Al2O3, MgO and Al2O3 agreed well with previous observations by one of the present authors.

Original languageEnglish
Pages (from-to)1059-1066
Number of pages8
JournalIsij International
Volume40
Issue number11
DOIs
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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