Thermodynamic Analysis of Fe2AlB2 Prepared by Molten Salt Electrochemical Method

Fe2AlB2Fe2AlB2 is a typical representative of MAB-phase; it becomes a research hotspot with its high damage tolerance and magnetothermal effect. Due to the high raw materialMaterials cost and long reaction time, a new idea of preparing Fe2AlB2Fe2AlB2 powder from Fe, Al2O3, and Na2B4O7 by molten salt electrochemicalMolten salt electrochemical method was proposed in this paper, and its theoretical feasibility was analyzed by thermodynamic study. The results showed Fe, Al2O3, and Na2B4O7 had no chemical reaction in NaCl-KCl less than 1200 ℃. The molar ratio of Fe, Al2O3, and Na2B4O7 was 2:0.75:0.5. The electrochemical reactionElectrochemical reactions conditions for the preparationPreparation of Fe2AlB2Fe2AlB2 were obtained at 700 ℃ ~ 1000 ℃, and the theoretical decompositionDecomposition voltage was −2.37 V ~ −3.12 V. B was electrolytically reduced before AlAl, and then Fe2AlB2Fe2AlB2 was formed by the reaction of FeB and AlAl with Fe. The thermodynamic calculation results indicated the preparationPreparation of Fe2AlB2Fe2AlB2 by molten salt electrochemicalMolten salt electrochemical method was feasible in theory.