Abstract
AbstractEquilibrium relationships on the liquidus surface in the system Fe0‐Al2O3SiO2 have been established by a modified quenching procedure. The crystal phases which separate from melts heated in iron crucibles are fayalite (2FeO·SO2), hercynite (FeO·Al2O3), tridymite and cristobalite (SiO2), mullite (3Al2O3·2SiO2), corundum (Al2O3), and wastite (approximately FeO). A considerable portion of this system is liquid at 1400°C. Diagrams show the isotherms and the index of refraction of the glasses formed.Two quintuple points have been established in this investigation. One point is at the composition, SiO2 42% by weight, Al2O313%, and FeO 45%, and is a eutectic involving the phases fayalite, hercynite, and tridymite at 970°C. ± 200C. The preferred composition of the second quintuple point is 48% of SO2, 23% of Al2O3, and 29% of FeO; it is a peritectic, and the crystal phases are mullite, hercynite, and tridyrnite. Crystallization from this melt without a change in the weight composition calls for the resorption of mullite at a temperature of 1100°C. ±20°C.
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