Thermodynamic Assessment of Phase Equilibria in the SrO-Al₂O₃ System

Abstract:

Thermodynamic modeling of phase equilibria with the subsequent construction of the phase diagram of the SrO–Al₂O₃ system has been carried out. To calculate the activities of the oxide melt in the course of this work, we used the approximation of the theory of subregular ionic solutions, with the most optimal values of the energy parameters Q₁₁₁₂ = –104 349: Q₁₁₂₂ = –217 689; Q₁₂₂₂ = –104 436 J/mole. The results obtained for the liquidus line in this work are in good agreement with the literature experimental data. In the course of the calculation, the values of the equilibrium constants for the formation of strontium aluminates from the components of the oxide melt were estimated.

• Periodical: Defect and Diffusion Forum (Volume 410)
• Pages: 725-729
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.410.725
• Online since: August 2021
• Authors: Larisa A. Makrovets*, Olga V. Samoilova, Igor V. Bakin
• Keywords: Phase Equilibria, SrO-Al₂O₃ System, Strontium Oxide, Theory of Subregular Ionic Solutions, Thermodynamic Modeling

References

[1] K. Tang, L.K. Jakobsson, K. Hildal, Thermodynamic evaluation of Sr-containing Si metals and silicate melts for Si–Sr alloy production, J. South. Afr. Inst. Min. Metall. 118(6) (2018) 601-605.

DOI: 10.17159/2411-9717/2018/v118n6a7

[2] I.V. Bakin, N.A. Shaburova, I.V. Ryabchikov, V.G. Mizin, B.F. Belov, G.G. Mikhailov, A.V. Senin, Experimental study of refining and modification of steel with Si–Ca, Si–Sr, and Si–Ba alloys, Steel Transl. 49 (2019) 543-547.

DOI: 10.3103/s0967091219080023

[3] M. Breitzmann, H.-J. Engell, D. Janke, Refining of steel melts using alkaline earth metals, Steel Res. 59(7) (1988) 289-294.

DOI: 10.1002/srin.198801505

[4] I.D. Rozhikhina, O.I. Nokhrina, V.I. Dmitrienko, M.A. Platonov, Modification of steel with barium and strontium, Steel Transl. 45 (2015) 908-912.

DOI: 10.3103/s0967091215120104

[5] I.V. Bakin, G.G. Mikhailov, V.A. Golubtsov, I.V. Ryabchikov, L.E. Dresvyankina, Methods for improving the efficiency of steel modifying, Mater. Sci. Forum. 946 (2019) 215-222.

DOI: 10.4028/www.scientific.net/msf.946.215

[6] F. Massazza, The system SrO–Al2O3, Chim. Ind. (Milan). 41 (1959) 108-115.

[7] F. Ganits, T.Yu. Chemekova, Yu.P. Udalov, The system SrO–Al2O3, Zh. Neorg. Khim. 24(2) (1979) 471-475.

[8] M. Starczewski, Treatise on solid state reactions in the ternary system SrO–Al2O3–SiO2, Zeszyty Nauk. Politech. Slask. Chem. 22 (1964) 5-75.

[9] X. Ye, W. Zhuang, J. Wang, W. Yuan, Z. Qiao, Thermodynamic description of SrO–Al2O3 system and comparison with other systems, J. Phase Equilib. Diff. 28 (2007) 362-368.

DOI: 10.1007/s11669-007-9086-x

[10] A. Shukla, Development of a Critically Evaluated Thermodynamic Database for the Systems Containing Alkaline-Earth Oxides, École Polytechnique de Montréal, Montreal, (2012).

[11] Y.-M. Sung, S. Kim, Sintering and crystallization of off-stoichiometric SrO∙Al2O3∙2SiO2 glasses, J. Mater. Sci. 35(17) (2000) 4293-4299.

[12] M. Capron, A. Douy, Strontium dialuminate SrAl4O7: synthesis and stability, J. Am. Ceram. Soc. 85(12) (2004) 3036-3040.

DOI: 10.1111/j.1151-2916.2002.tb00575.x

[13] A.N. Kogorodskaya, G.N. Shabanova, Thermodynamic database of refractory strontium aluminates, Collection of Scientific Papers of PJSC The URIR Named after A.S. Berezhnoy,. 112 (2012) 208-213.

[14] S. Ito, S. Banno, K. Suzuki, M. Inagaki, Phase transition in SrAl2O4, Z. Phys. Chem. 105 (1977) 173-178.

[15] G.G. Mikhailov, B.I. Leonovich, Yu.S. Kuznetsov, Thermodynamics of Metallurgical Processes and Systems, Moscow Institute of Seel and Alloys Publishing house, Moscow, (2009).

[16] O.V. Samoilova, L.A. Makrovets, E.A. Trofimov, Thermodynamic simulation of the phase diagram of the Cu2O–Na2O–K2O system, Moscow Univ. Chem. Bull. 73(3) (2018) 105-110.

DOI: 10.3103/s0027131418030057

[17] O.V. Samoilova, L.A. Makrovets, Thermodynamic modeling of phase equilibria in the FeO–MgO–Al2O3 system, Mater. Sci. Forum. 989 (2020) 3-9.

DOI: 10.4028/www.scientific.net/msf.989.3

[18] O. Kubaschewski, C.B. Alcock, Metallurgical Thermochemistry, Pergamon Press Ltd Publ., Oxford, (1979).

[19] L.S. Darken, R.W. Gurry, The system iron–oxygen. II. Equilibrium and thermodynamics of liquid oxide and other phases, J. Am. Chem. Soc. 68 (1946) 798-816.

DOI: 10.1021/ja01209a030

[20] X. Irgashov, V.D. Tarasov, V.Ya. Chekhovskoy, Thermodynamic properties of strontium oxide in solid and liquid phases, High Temperature. 23(1) (1985) 86-91.