Phase equilibria of CaO-Al2O3-Ti2O3 system at 1500°C and 1600 ° C in C/ CO equilibrium atmosphere

The phase diagram of CaO-Al2O3-Ti2O3 system has significant implications for the metallurgical slag design of Al- Ti alloy steel. In this work, the high-temperature equilibrium experiments were conducted at 1500 degrees C and 1600 degrees C in C/CO equilibrium atmosphere, respectively. The types and compositions of the equilibrium phases were determined by Electron Probe Micro Analysis (EPMA) and X-ray diffraction (XRD). The isothermal section of CaO-Al2O3-Ti2O3 system in the low w (TiO x ) region at 1500 degrees C was constructed for the first time, in which there are 6 three-phase fields, 7 two-phase fields, and a liquid phase field. The isothermal section of CaO-Al2O3-Ti2O3 system in the low w (TiO x ) region at 1600 degrees C was constructed and revised, including 3 three-phase fields, 6 twophase fields, and a liquid phase field. Additionally, under the current experimental condition, the reasons for the formation of TiC in the high w (TiO x ) region of this slag system were analyzed, further discussing the effect of carbon on the phase equilibria of CaO-Al2O3-Ti2O3 system.