In situ synthesis of NbB2–NbC composite powders by milling-assisted carbothermal reduction of oxide raw materials

Balcı, Özge; Ağaoğulları, Duygu; Ovalı, Didem; Öveçoğlu, M. Lütfi; Duman, İsmail

doi:10.1016/j.apt.2015.06.001

Cited by 27 publications

(17 citation statements)

References 39 publications

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“…Presence of the B 2 O 3 is determined by FTIR analysis, and FTIR spectra of the both as-blended and 5 h of milled samples were given in Figure 2. B-O deformation and stretching modes are seen clearly near 1200 and 1400 cm -1 , respectively [13,16]. Additionally, physically or chemically adsorbed humidity on the surfaces of the powders leads to the formation of B-H (at about 2275 cm -1 ) and B-OH bonds (at about 3250 cm -1 ) [17].…”

Section: Resultsmentioning

confidence: 94%

“…There is no evidence of the formation of new phases during milling up to 5 h ( Figure 1). Only V 2 O 5 (ICDD card number = 01-089-2483) and C (ICDD card number = 00-056-0159) phases are detected in the XRD analyses of the as-blended powders and those milled for 1 and 5 h. Although, B 2 O 3 was used as starting material, there was no peak belonging to B 2 O 3 due to its amorphous structure [13]. Presence of the B 2 O 3 is determined by FTIR analysis, and FTIR spectra of the both as-blended and 5 h of milled samples were given in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2018

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The present study reports the in-situ synthesis of hybrid powders containing vanadium borides (VB 2 , V 3 B 4 and V 2 B 3) and vanadium carbide (VC) using powder metallurgy methods. VB 2-V 3 B 4-V 2 B 3 /VC hybrid powders were synthesized from V 2 O 5 , B 2 O 3 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, VB 2-V 3 B 4-V 2 B 3 /VC hybrid powders were obtained with an amount of unreacted V 2 O 5. Annealing temperatures of 1500 and 1600°C resulted in the formation of VB 2 , V 3 B 4 , V 2 B 3 and VC phases. Milling affected the weight percentages of the phases as well as the type of major boride phase.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

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

et al. 2018

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“…These two endotherms are very slight in the mechanically activated powders. It was previously reported that the vaporization of water adsorbed onto the B 2 O 3 structure occurred at about 190 °C [34]. Also, anhydrous HfCl 4 was found to be sublimed at the temperature range of 240-300°C [33].…”

Section: Thermodynamic Calculationsmentioning

confidence: 97%

Mechanical activation-assisted autoclave processing and sintering of HfB2-HfO2 ceramic powders

Akçamlı

Ağaoğulları

Balcı

et al. 2016

Ceramics International

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“…Up to now, oxides (Y2O3, La2O3, Al2O3, SiO2), borides (TiB2, ZrB2), carbides (SiC, TiC, ZrC) and nitrides (AlN, Si3N4) have been added as reinforcements into the metal matrix by various methods to develop the mechanical properties of the composites. [10]. These reinforcements significantly enable to increase the hardness and wear resistance values of the metal matrix composites compared with Al and its alloys [10].…”

Section: Introductionmentioning

confidence: 99%

“…[10]. These reinforcements significantly enable to increase the hardness and wear resistance values of the metal matrix composites compared with Al and its alloys [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of NbB2 Addition on the Microstructure and Mechanical Properties of Mechanically Alloyed Al-12.6Si Alloys

Tekoğlu¹,

Mertdinç²,

Gökçe³

et al. 2016

World Congress on Mechanical, Chemical, and Material Engineering

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This study reports the effect of NbB2 particles on the Al-12.6 wt.% Si matrix powders and composites in regard of physical, microstructural and mechanical properties. In order to obtain hybrid powders, Al-12.6 wt.% Si-2 wt.% NbB2 blends were mechanically alloyed (MA'd) for various durations (1, 4 and 8 h ) in a Spex™ Mixer/Mill using hardened steel vial/balls with a 7/1 ball-to-powder weight ratio. A hydraulic press with a uniaxial pressure of 450 MPa was used for the compaction of the as-blended/MA'd powders. Green compacts were sintered at 570°C for 2 h under Ar gas atmosphere. X-ray diffractometry (XRD) and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) techniques were utilized for the microstructural characterization of the as-blended/MA'd powders and the sintered composites. Differential scanning calorimetry (DSC) analyses were also conducted on the powder products. Sintered samples were characterized by density and Vickers microhardness measurements and sliding wear tests. With increasing MA time, mechanical improvement in composite properties was observed. Reinforcing particles had positive effect on the mechanical properties of the matrix: Al-12.6 wt.% Si-2 wt.% NbB2 MA'd for 4 h showed higher microhardness value (158.50±10.02 MPa) and lower wear volume loss (0.161 mm 3 ) than those of Al-12.6 wt.% Si matrix MA'd for 4 h. Al-12.6 wt.% Si matrix MA'd for 4 h showed microhardness value (146.70±8.81 MPa) and wear volume loss (0.194 mm 3 ).

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In situ synthesis of NbB2–NbC composite powders by milling-assisted carbothermal reduction of oxide raw materials

Cited by 27 publications

References 39 publications

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

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

Mechanical activation-assisted autoclave processing and sintering of HfB2-HfO2 ceramic powders

Effect of NbB2 Addition on the Microstructure and Mechanical Properties of Mechanically Alloyed Al-12.6Si Alloys

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