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• W1936247712 abstract "The knowledge of phase equilibria and thermodynamic properties of liquid and solid oxides can help us better understand metallurgical, ceramic or geological processes. The main aim of the present study is the critical evaluation and thermodynamic optimization of solid and liquid (MnO-Al2O3 based) oxides which are of interest to the steelmaking and ferro-Mn industries. These newly developed databases coupled with the previous databases can be used along with any software for Gibbs energy minimization to predict the phase relationships and the thermodynamic properties of any relevant system. Usually, thermodynamic databases can save both cost and time, which, otherwise would have been spent to optimize the existing process and develop any new process. The production of steels with higher amounts of manganese and aluminum has gained considerable importance in the recent past. Steels with high concentration of manganese and aluminum like TWIP steel and TRIP steel have exceptional properties which classify them as special steels; needless to say the various range of applications they can cater to. Ferromanganese, which contains a large amount of manganese, is also a very useful product required in the production of high manganese steels. The production of these alloys results in the generation of slags which are rich in MnO and Al2O3. Hence, knowledge of the phase relations between these two components is of utmost importance in order to maximize the efficiency of the production process. Only a very good knowledge of Gibbs energy of all the phases present in the binary system MnO-Al2O3 can allow us to predict the correct equilibrium conditions during the production process. The critical evaluation and thermodynamic optimization of all the available phase diagram data and thermodynamic properties of the system Mn-Al-O have been carried out in the first part of the present work. Thermodynamic modeling for different phases such as slag, spinel (cubic and tetragonal) and bixbyite has been performed using Modified Quasichemical Model, Compound Energy Formalism and random mixing model, respectively. The sublattice structure of solid solution phases were properly taken into account in the thermodynamic modeling and their thermodynamic properties and structural data were reproduced using the physically meaningful model parameters. All the reliable experimental data of the Mn-Al-O system were reproduced within error limits from room temperature to above the liquidus temperatures at all compositions and oxygen partial pressure ranging from metal saturation to air. The present MnAl2O4-Mn3O4 spinel solutions can be integrated with all the other spinel solutions developed earlier to obtain an extensive spinel solution database. This database along with the software for Gibbs energy minimization can be utilized to perform various calculations and predict the phase relations at any given condition. In the next part of the present work, the binary MnO-Al2O3 system was extended to the higher order systems like MnO-Al2O3-SiO2,…" @default.
• W1936247712 created "2016-06-24" @default.
• W1936247712 creator A5043099254 @default.
• W1936247712 date "2013-01-01" @default.
• W1936247712 modified "2023-09-24" @default.
• W1936247712 title "Critical evaluation and thermodynamic modeling of phase equilibria in the Fe-Ca-Mg-Mn-Al-Si-O system" @default.
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