Thermodynamic Modeling of MgO-Al2O3-TiO2 System

• 作者: Oksana M.BORYSENKO Galina M.SHABANOVA Sergey M.LOGVINKOV Lgor A.OSTAPENKO
• 来源期刊: 中国耐火材料（英文版）
• 年，卷（期）: 2021,（3）
• 页码范围: 17-22
• 页数: 6页
• 语种: 英文
• DOI: 10.19691/j.cnki.1004-4493.2021.03.004

摘要

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 1900 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 1537 K TiO2 existed as the polymorphous modification,i.e.anatase;in the temperature range from 1537 K to 2076 K TiO2 existed as a polymorphous modification in form of rutile and tialite was stable;and at the temperatures above 2076 K the availability of stochiometric compound of Al4TiO8 was possible.In the temperature range lower than 1537 K the two-phase equilibra of Al2O3-MgTi2O5,MgTi2O5-MgAl2O4,MgTiO3-MgAl2O4,and Mg2TiO4-MgAl2O4 were stable;in the temperature range from 1537 K to 2076 K the two-phase equilibria of MgTi2O5-Al2TiO5,MgTiO3-Al2TiO5,MgTiO3-Al2O3,MgTiO3-MgAl2O4,and Mg2TiO4-MgAl2O4 were stable,and above 2076 K the MgTi2O5-Al2TiO5,MgTi2O5-Al4TiO8,Al4TiO8-MgTiO3,Al4TiO8-Mg2TiO4,Al4TiO8-MgO,and Al4TiO8-MgAl2O4 systems were stable.