China's Refractories


China's Refractories ›› 2021, Vol. 30 ›› Issue (3): 17-22.DOI: 10.19691/j.cnki.1004-4493.2021.03.004

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Thermodynamic Modeling of MgO-Al2O3-TiO2 System

Oksana M. BORYSENKO1,*(), Galina M. SHABANOVA1, Sergey M. LOGVINKOV2, Lgor A. OSTAPENKO3   

  1. 1 Kharkiv Polytechnic Institute, National Technical University, Kharkiv 61002, Ukraine
    2 Simon Kuznets Kharkiv National University of Economics, Kharkiv 61166, Ukraine
    3 TOV “Druzhkivskiy Vognetrivkiy zavod”, Druzhkovka 84293, Ukraine
  • Online:2021-09-15 Published:2021-11-26
  • Contact: Oksana M. BORYSENKO
  • About author:Oksana M. Borysenko is a docent, and a doctoral candidate of the Department of Ceramics, Refractory Materials, Glass and Enamels Technology of Kharkiv Polytechnic Institute of National Technical University in Ukraine, majored in technical sciences. Her field of scientific interests embraces refractory nonmetal materials, multicomponent system condition diagrams, solid phase exchange reactions and their conjugation, and the self-organization of phases into dissipative structures. She had more than 130 scientific publications.


This scientific paper gives consideration to the information on the structure of the triple component system, in particular MgO-Al2O3-TiO2 that serves as a basis for the production of thermal resistance materials. The structure of such binary systems as MgO-Al2O3, Al2O3-TiO2, MgO-TiO2 was described and the data available for the MgO-Al2O3-TiO2 system were given. Thermodynamic data on all the system compounds were also presented and used for the computation of a change in the free Gibbs energy in the temperature range form 800 K to 1 900 K for the basic exchange reactions. It was established that the triangulation of the MgO-Al2O3-TiO2 system was changed in the three temperature intervals: in the temperature range lower than 1 537 K TiO2 existed as the polymorphous modification, i.e. anatase; in the temperature range from 1 537 K to 2 076 K TiO2 existed as a polymorphous modification in form of rutile and tialite was stable; and at the temperatures above 2 076 K the availability of stochiometric compound of Al4TiO8 was possible. In the temperature range lower than 1 537 K the two-phase equilibra of Al2O3-MgTi2O5, MgTi2O5-MgAl2O4, MgTiO3-MgAl2O4, and Mg2TiO4-MgAl2O4 were stable; in the temperature range from 1 537 K to 2 076 K the two-phase equilibria of MgTi2O5-Al2TiO5, MgTiO3-Al2TiO5, MgTiO3-Al2O3, MgTiO3-MgAl2O4, and Mg2TiO4-MgAl2O4 were stable, and above 2 076 K the MgTi2O5-Al2TiO5, MgTi2O5-Al4TiO8, Al4TiO8-MgTiO3, Al4TiO8-Mg2TiO4, Al4TiO8-MgO, and Al4TiO8-MgAl2O4 systems were stable.

Key words: phase equilibria, change in Gibbs free energy, triangulation, magnesium aluminate spinel, tialite, geikielite, carroite, qandilite