Generation and characterization of nano-tungsten carbide particles by wire explosion process

Debalina, B.; Kamaraj, M.; Murthy, B. S.; Chakravarthi, Srikumar; Sarathi, R.

doi:10.1016/j.jallcom.2010.01.140

Cited by 36 publications

(6 citation statements)

References 13 publications

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“…Figure shows the FTIR analysis of the samples using the DRIFT setup. Peaks at 1269 and 1186 cm –1 are attributed to the stretching vibration W–C, two peaks at 839 and 898 cm –1 are ascribed to the vibrational stretching modes of tungsten oxide WO, and the peak at 746 cm – 1 corresponds to O–W–O stretching vibrations. − The spectra of the activated sample contain a peak at 1083 cm –1 , which can be due to the stretching vibrational modes of W–C in the hexagonal crystalline structure . Besides, DRIFT was used for the determination of functional groups on the carbon surfaces.…”

Section: Results and Discussionmentioning

confidence: 99%

New Type of Catalyst for Efficient Aerobic Oxidative Desulfurization Based On Tungsten Carbide Synthesized by the Microwave Method

et al. 2022

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Herein, we present a new type of high-performance catalyst for aerobic oxidation of organosulfur compounds based on tungsten carbide. The synthesis of tungsten carbide was performed via microwave irradiation of the precursors, which makes it possible to obtain a catalyst in just 15 min. The synthesized catalyst was investigated by a variety of physicochemical methods: X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, electron microscopy, and N 2 adsorption/desorption. It was shown that active centers containing tungsten in the transition oxidation state (+4) play a key role in the activation of oxygen. The main factors influencing the conversion of dibenzothiophene (DBT) were investigated. It should be noted that 100% conversion of DBT can be achieved under relatively mild conditions: 120 °C, 3 h, 6 bar, and 0.5% wt catalyst. The catalyst retained its activity for at least six oxidation/regeneration cycles. The simplicity and speed of synthesis of the proposed catalyst in combination with its high activity and stability open broad prospects for its further use both for oxidative desulfurization and for other reactions of aerobic oxidation of organic substrates.

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Section: Results and Discussionmentioning

confidence: 99%

New Type of Catalyst for Efficient Aerobic Oxidative Desulfurization Based On Tungsten Carbide Synthesized by the Microwave Method

et al. 2022

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“…FTIR spectrum of WC-W 2 C composite (W 16 wt%) shows (Fig. 6) peaks due to vibrational stretching of W-C in hexagonal crystal structure, C=C (aromatic) stretching and O-H stretching at 1039 cm −1 , 1634 cm −1 and 3430 cm −1 [26,27] respectively. FTIR analysis further corroborates to our XRD, SAED and EDS results for confirming about the purity of composite without having any presence of impurity.…”

Section: Ftir and Xps Analysesmentioning

confidence: 99%

A novel WC–W2C composite synthesis by arc plasma melt cast technique: microstructural and mechanical studies

et al. 2021

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WC–W2C composites of three different compositions have been synthesized from mixture of WC + W (0, 5 and 16 wt% W) by thermal arc plasma melt-cast technique. Various grown phases observed in the composites consisting of major phases of WC and W2C and minor phases of unbound C (graphite) and tungsten (W) were confirmed by X-ray diffraction, selected area electron diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared studies. Transmission electron microscopy and field emission scanning electron microscopy show polycrystalline nature of composites. Energy dispersive spectroscopy (of X-ray) infers the absence of any impurity in the composite. Almost porous free nature of composites were observed from X-ray micro computed tomography and BET analysis studies. WC–W2C composite (16 wt% W) shows 25% and 21% higher micro hardness (2535 VHN) and Young’s modulus (625 GPa) values than that of pure melt cast WC sample.

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“…The developed process requires spray drying the starting powders prior to heat treatment to obtain nano size WC. Some other techniques like ball milling [15,16] and wire explosion [17] were recently explored for synthesis of nano size tungsten carbide powder. However the developed processes are very expensive and have low probability for commercially manufacturing large quantities of nano size tungsten carbide powders with consistent quality.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nanocrystalline tungsten and tungsten carbide powders in a single step via thermal plasma technique

Enneti

2015

International Journal of Refractory Metals and Hard Materials

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Generation and characterization of nano-tungsten carbide particles by wire explosion process

Cited by 36 publications

References 13 publications

New Type of Catalyst for Efficient Aerobic Oxidative Desulfurization Based On Tungsten Carbide Synthesized by the Microwave Method

New Type of Catalyst for Efficient Aerobic Oxidative Desulfurization Based On Tungsten Carbide Synthesized by the Microwave Method

A novel WC–W2C composite synthesis by arc plasma melt cast technique: microstructural and mechanical studies

Synthesis of nanocrystalline tungsten and tungsten carbide powders in a single step via thermal plasma technique

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