Add time:07/26/2019         Source:sciencedirect.com

An experimental study on the preparation of various vanadium borides (including V3B2, VB, V5B6, V3B4, V2B3, and VB2) in the V–B system was conducted by self-propagating high-temperature synthesis (SHS) from the elemental powder compacts. Close flame-front velocities and comparable combustion temperatures were observed for the reactant compacts with V:B = 1:1, 5:6, and 3:4, and they were much higher than those for the samples of other compositions. The lowest combustion velocity and temperature were detected in the sample of V:B = 1:2. According to the XRD analysis, pure VB was produced not only from the sample of V:B = 1:1, but also from those of V:B = 5:6 and 3:4. For the powder compact with V:B = 1:2, VB2 was dominantly formed along with trivial amounts of VB and V3B4. A multiphase product composed of VB and V3B4 at comparable quantities was yielded from the sample of V:B = 2:3. The only V-rich sample formulated at V:B = 3:2 generated monoboride VB and left the end product a large amount of unreacted vanadium.

▶ A comparative study on the preparation of various V–B compounds (including V3B2, VB, V5B6, V3B4, V2B3, and VB2) was firstly conducted by the SHS process. ▶ Sustainability of solid state combustion depended strongly on the starting stoichiometry and preheating temperature of the reactant compact. ▶ Variations of the combustion temperature and flame-front velocity with sample stoichiometry were presented. ▶ The phase composition of the final products was examined and the associated activation energy was determined.

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