Phase equilibria studies of CaO-SiO2-Al2O3-Fe2O3-MgO system using CALPHAD
Source abstract
Abstract
Abstract A detailed CALPHAD (CALculation of PHAse Diagram) based thermodynamic study on CaO- SiO 2 -Al 2 O 3 -Fe 2 O 3- MgO system (C-A-S-F-M) has been carried out to study the evolution of phases during heating and to investigate the effects of individual oxides. The important phases present at high temperature in the system are tricalcium silicate (C 3 S), dicalcium silicate (C 2 S), tricalcium aluminate (C 3 A), dicalcium ferrite (C 2 F) and a liquid phase. The evolution of liquid phase and other important phases predicted by CALPHAD closely matches with the experimental results. It was observed that in C-A-S-F-M system, there is a critical percentage of CaO and SiO 2 at which C 3 S is maximum. Both Fe 2 O 3 and Al 2 O 3 significantly increase the amount of liquid phase. Both Fe 2 O 3 and Al 2 O 3 reduce C 3 S and increase C 2 S in the system. Up to 1.5 wt%, MgO also helps in increasing liquid phase. A mathematical model to predict phases has been developed as an alternative to the Bougue's equation which is very effective in predicting phase fractions.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Metallurgical Processes and Thermodynamics · Materials Engineering and Processing · Advanced ceramic materials synthesis
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