Equilibrium Phase Relations of a SiO₂–Al₂O₃–FeO_x System with 10 wt % CaO Addition for the Production of Continuous Basalt Fibers

Abstract

The continuous basalt fibers have been regarded as one of the most promising green materials in modern society; however, key thermodynamic equilibrium data are insufficient for a better understanding of the crystallization mechanism during the fiber forming process. In the present study, the equilibrium phase relations of the core SiO 2 –Al 2 O 3 –FeO x subsystem with fixed 10 wt % CaO were experimentally determined using the classic equilibrium-quenching technique with the scanning electron microscopy–energy-dispersive X-ray spectroscopy analysis. All samples were presented as liquid-silica coexisting within the basalt composition range. The 1300 and 1400 °C isotherms were constructed based on the experimental results. However, significant discrepancies were confirmed with further comparison of the experimental results with FactSage predictions, indicating that more efforts are needed for the optimization of the basalt oxide-related thermodynamic databases.

Phase equilibria of MgO–Al2O3–TiO2 system at 1600°C in air: Emphasis on pseudobrookite and spinel solid solution phases

“…The high-temperature equilibration-quenching experiments were conducted in air to investigate the equilibrium phase relations in MgO-Al 2 O 3 -TiO 2 system, and the detailed description of the experimental principles and procedures can be found from previous publications. [44][45][46][47][48] To avoid the influence of other impurities on the…”

“…The high‐temperature equilibration‐quenching experiments were conducted in air to investigate the equilibrium phase relations in MgO–Al 2 O 3 –TiO 2 system, and the detailed description of the experimental principles and procedures can be found from previous publications 44–48 . To avoid the influence of other impurities on the equilibrium phase relations, high purity powders of MgO (Sinopharm Reagent 99.9 wt.%), Al 2 O 3 (Sinopharm Reagent 99.99 wt.%), and TiO 2 (Aladdin 99.0 wt.%) were selected as the raw materials, about 0.4‐g mixed sample was prepared with the pre‐calculated proportions, and the mixture was ground in an agate mortar for at least 20 min.…”

Equilibrium Phase Relations for a SiO2-Al2O3-FeOx System at 1300 °C and 1400 °C in Air

“…Therefore, a long-term fundamental thermodynamic investigation for the construction of the thermodynamic database of a metallurgical slag system was started a few years ago [33]. The premise of this huge project is to update the key thermodynamic properties for the key binary and ternary systems.…”