The niobium aluminides intermetallic particles were prepared by a sodiothermic reduction process using Nb2O5 and NaAlO2 as raw materials, NaCl and CaCl2 as the diluents and sodium as a reducing agent. The phases, morphology and particle size of niobium aluminides intermetallic powders depending on the molar ratio of oxygen in raw materials and CaCl2 in the molten salt, the atomic ratio of niobium and aluminum in raw materials and premelting time in molten salts were analyzed. The NbAl3 and Nb3Al particles are obtained at 680°C and 750°C for the 6.0 h premelting time, respectively, and the particle size of NbAl3 and Nb3Al powders is about 50~260 nm and 30~180 nm. Besides, the purity of the niobium aluminides intermetallics powders was increased along with the increasing of the premelting time.
|Number of pages
|Fenmo Yejin Cailiao Kexue yu Gongcheng/Materials Science and Engineering of Powder Metallurgy
|Published - 2013 Apr
- Molten salts
- Niobium aluminides intermetallics
- Sodiothermic reduction process