Synthesis of W2B5 powders by the reaction between WO3 and amorphous B in NaCl/KCl flux

W2B5 powder was synthesized by the reaction between WO3 and amorphous B in NaCl/KCl flux. The results indicate that appropriate amount of NaCl/KCl flux significantly improved the completion of borothermal reduction reaction. When the weight of NaCl/KCl was 10 times that of WO3/B, pure phase W2B5 powder could be obtained at 1100 °C. The synthesized powder was composed of agglomerated nanosized particles. The oxidation resistance of the synthesized W2B5 powder was evaluated by a simultaneous thermogravimetric and differential scanning calorimetry technique.