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Fe–Mn–Si alloys exhibit excellent shape memory effect, corrosionCorrosion resistance, and weldability, making them promising for engineering applications such as pipeline connections and aerospace smart structures. This study investigates the thermodynamicThermodynamic behavior of synthesizing Fe–Mn–Si alloy via molten saltMolten salt electro-deoxidation in the range of 500–1000 °C, using Fe2O3, MnO2, and SiO2 as raw materials. Thermodynamic analysisThermodynamic analysis reveals that MnO2 spontaneously decomposes into Mn2O3 above 600 °C. Concurrently, O2− removed at the cathode interact with Ca2+ in the molten saltMolten salt, reacting with Fe2O3 and SiO2 to form CaFe2O4 and CaSiO3, which participate in reductionReduction reactions. Under applied voltage, Fe is first reduced (Fe2O3/CaFe2O4 → Fe3O4 → FeO → Fe), followed by Mn(MnO2 → Mn2O3 → Mn3O4 → MnO → Mn). In contrast, due to its high thermal stability, CaSiO3 requires stronger reducing conditions, leading to final reductionReduction of Si(SiO2/CaSiO3 → Si). Ultimately forming the Fe–Mn–Si alloy.

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Thermodynamic Analysis of Fe–Mn–Si Alloy Preparation by Molten Salt Electro-deoxidation Process

  • 会议论文

  • 发表日期：

    2026年

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  • Shaoqing Chen,
  • Jinglong Liang

摘要

Fe–Mn–Si alloys exhibit excellent shape memory effect, corrosionCorrosion resistance, and weldability, making them promising for engineering applications such as pipeline connections and aerospace smart structures. This study investigates the thermodynamicThermodynamic behavior of synthesizing Fe–Mn–Si alloy via molten saltMolten salt electro-deoxidation in the range of 500–1000 °C, using Fe2O3, MnO2, and SiO2 as raw materials. Thermodynamic analysisThermodynamic analysis reveals that MnO2 spontaneously decomposes into Mn2O3 above 600 °C. Concurrently, O2− removed at the cathode interact with Ca2+ in the molten saltMolten salt, reacting with Fe2O3 and SiO2 to form CaFe2O4 and CaSiO3, which participate in reductionReduction reactions. Under applied voltage, Fe is first reduced (Fe2O3/CaFe2O4 → Fe3O4 → FeO → Fe), followed by Mn(MnO2 → Mn2O3 → Mn3O4 → MnO → Mn). In contrast, due to its high thermal stability, CaSiO3 requires stronger reducing conditions, leading to final reductionReduction of Si(SiO2/CaSiO3 → Si). Ultimately forming the Fe–Mn–Si alloy.