Synthesis of VB2-V3B4-V2B3/VC hybrid powders via powder metallurgy processes

Öz

The present study reports the in-situ synthesis of hybrid powders containing vanadium borides (VB₂, V₃B₄ and V₂B₃) and vanadium carbide (VC) using powder metallurgy methods. VB₂-V₃B₄-V₂B₃/VC hybrid powders were synthesized from V₂O₅, B₂O₃ and C powder blends via a carbothermal reduction route assisted by mechanical milling. Powder blends were mechanically milled up to 5 h in a high-energy ball mill. The milling process reduced the crystallite size, increased the uniformity of the particle distribution and hence increased the reactivity of the starting powders. As-blended and milled powders were annealed at different temperatures (1400, 1500 and 1600°C) for 12 h to investigate the probability of achieving vanadium boride and carbide phases simultaneously. Annealed powders were characterized using X-ray diffractometer (XRD), scanning electron microscope/energy dispersive spectrometer (SEM/EDS) and particle size analyzer. In case of using annealing temperature of 1400°C, VB₂-V₃B₄-V₂B₃/VC hybrid powders were obtained with an amount of unreacted V₂O₅. Annealing temperatures of 1500 and 1600°C resulted in the formation of VB₂, V₃B₄, V₂B₃ and VC phases. Milling affected the weight percentages of the phases as well as the type of major boride phase.

Anahtar Kelimeler

• Annealing,mechanical milling,microstructure,vanadium borides

Kaynakça

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