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

Yıl 2018, , 180 - 187, 30.11.2018

Duygu Ağaoğulları , Özge Balcı , Siddika Mertdinç , Emre Tekoğlu , M. Lütfi Öveçoğlu

https://doi.org/10.30728/boron.441148

Cited By: 2

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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