The effect of 5 wt.% Fe3O4 addition on the phase equilibria of CaO-SiO2-TiO2 system at 1400°C in air

The equilibrium phase relations of the CaO-SiO2-TiO2-5 wt.% Fe3O4 system were experimentally investigated at 1400 °C in air. High-temperature equilibration-quenching techniques were employed in an electric MoSi2 resistance heated furnace, with phase composition analysis conducted using an Electron Probe Micro-Analyzer and X-ray diffraction. A single liquid region, liquid-solid phase equilibrium including liquid-tridymite, liquid-rutile, liquid-perovskite, liquid-wollastonite, as well as three-phase equilibrium of liquid-tridymite-rutile and liquid-rutile-perovskite are found. The 1400 °C isothermal sections of the CaO-SiO2-TiO2-5 wt.% Fe3O4 system in air were projected. The present experimental results exhibited good agreement with the calculation results obtained from FactSage.