A Phase Equilibrium of the Iron-rich Corner of the CaO–FeO–Fe<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> System in Air and the Determination of the SFC Primary Phase Field

Abstract

Experimental studies of the CaO-FeO-Fe2O3-SiO2 system in air from 1 200 degrees C to 1 260 degrees C have been carried out in the Fe -rich region with particular focus on the phase equilibria associated with silico-ferrite of calcium (SFC) phase. The measurements have been made possible through the use of a modified experimental technique involving high temperature equilibration and rapid quenching followed by electron probe X-ray microanalysis (EPMA). Isothermal sections for 1 220 degrees C, 1 240 degrees C, 1 255 degrees C and 1 260 degrees C are reported providing information on the limits of stability of the SFC solid solution and the liquidus in the SFC primary phase field for the first time.