Direct synthesis of niobium aluminides powders by sodiothermic reduction in molten salts

摘要

Niobium aluminides were directly synthesized by a sodiothermic reduction process of NbCl_5 - AlCl_3 which was dispersed into LiCl - KC1 - NaCl -CaCl_2 melts. The melt supplied a homogenous reaction medium which was substantially beneficial to the co-reduction of Nb and Al to form niobium aluminides in situ. The reduction was performed at 500°C for 4 hours. The products were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The corresponding results indicated that niobium aluminides powders were successfully synthesized.