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

Abstract

The equilibrium phase relations of the CaO-SiO₂-TiO₂-5wt%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 microanalyzer and X-ray diffraction. A single liquid region, liquid-solid phase equilibria regions (including liquid-tridymite, liquid-rutile, liquid-perovskite, and liquid-wollastonite), and three-phase equilibria regions of liquid-tridymite-rutile and liquid-rutile-perovskite were found. The 1400°C isothermal sections of the CaO-SiO₂-TiO₂-5wt%Fe₃O₄ system in air were projected. The present experimental results exhibited good agreement with the calculation results obtained from FactSage.

Keywords

phase diagram / titanium / magnetite / thermodynamic / oxide

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University of Science and Technology Beijing