Thermodynamic Analysis of Nb–Ti–Al Alloys Prepared by Molten Salt Electro-deoxidation Process
摘要
Niobium-titanium aluminumAluminum alloys possess excellent thermal stability, corrosionCorrosion resistance, and low densityDensity, and are widely used in aerospace, medical devices, and industrial energy fields. In this paper, Nb2O5, TiO2, and Al2O3 were used as raw materials to prepare Nb–Ti–Al alloy in the NaCl-CaCl2 molten saltMolten salt system by the molten saltMolten salt electro-deoxidation processProcess. The reductionReduction preparation processProcess was analyzed through thermodynamicThermodynamic calculation to clarify the reaction processProcess. The results show that at 873–1373 K, the O2− generated by cathode reductionReduction deoxidation reacts with Ca2+ in the molten saltMolten salt and Al2O3 and TiO2 in the cathode to form CaAl12O19 and Ca4Ti3O10. Among them, Nb2O5 is reduced preferentially, and Ca4Ti3O10 is reduced to the elemental form before CaAl12O19 and forms the Nb–Ti–Al alloy with Nb.