Two-step synthesis of nanostructured tungsten carbide-cobalt powders

Fu, Lei; Cao, Liqin; Fan, Yousan

doi:10.1016/s1359-6462(01)00668-6

Cited by 118 publications

(49 citation statements)

References 10 publications

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“…12 This fact has led to an important increase in demand on nanocrystalline WC powders and WC-Co mixtures and therefore the means of producing them. Among others, rapid carburisation, 13 spraying conversion, [14][15][16] thermochemical precursor reduction, 17 hydrogen plasma reduction, 16,18 integrated mechanical and thermal processing 19 and high energy milling 1,12,[20][21][22][23][24] are the most used. High energy milling is the most versatile technique for the production of nanostructured materials, because it is relatively straightforward and requires low investments.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ultrafine and nanocrystalline WC–Co mixtures by planetary milling and subsequent consolidations

et al. 2011

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In this work ultrafine and nanocrystalline WC-Co mixtures were obtained by low energy milling in planetary ball mill. The effect of the processing conditions on the reduction and distribution of the grain sizes and the internal strains level were studied. The characterisation of the powder mixtures was performed by means of scanning and transmission electron microscopy and X-ray diffraction analysis. Observations through SEM and TEM images showed a particle size below 100 nm, after milling. The X-ray diffraction profile analysis revealed a WC phase refined to a crystallite size of 19 nm. The mixtures obtained have been consolidated and mechanical and microstructurally characterised. The results show improvements in resistant behaviour of the material consolidated from nanocrystalline powders, in spite of the grain growth experienced during the sintering. The best results were found for the material obtained by wet milling during 100 h, which presents values of hardness higher than 1800 HV.

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Section: Introductionmentioning

confidence: 99%

Fabrication of ultrafine and nanocrystalline WC–Co mixtures by planetary milling and subsequent consolidations

et al. 2011

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“…3,4) In recent days, nanocrystalline powders have been developed by the thermochemical and thermomechanical process named as the spray conversion process (SCP), co-precipitation and high energy milling. [5][6][7] However, the grain size in sintered materials becomes much larger than that in pre-sintered powders due to a fast grain growth during conventional sintering process.…”

Section: Introductionmentioning

confidence: 99%

Rapid Consolidation of Nanostructured TiCu Compound by High Frequency Induction Heating and Its Mechanical Properties

Shon

Kim

et al. 2010

Mater. Trans.

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Nanosized TiCu powders were synthesized by high energy ball milling of micron-sized Ti and Cu powders. Dense TiCu could be consolidated by high frequency induction sintering method within 1 min using both horizontally milled elemental powders of Ti+Cu and mechanically synthesized powders of TiCu. The consolidation was accomplished under the combined effect of induced current and applied mechanical pressure. The grain size, sintering behavior and hardness of TiCu sintered from both powders were examined.

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“…Carburization of tungsten powder at high temperature is typically used to produce tungsten carbide. 4,5 With the goal of obtaining nanostructured powders, other techniques including, for example, ball milling, [6][7][8] spray conversion process (SCP), 9 and spray thermal decomposition, 5 have also been used recently. Moreover, 99% pure WC powders with 1-2 m particle size were prepared from elements through the Selfpropagating high-temperature synthesis (SHS) method in the presence of a highly exothermic mixture (Mg + Teflon) as reaction promoter.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous spark plasma synthesis and consolidation of WC/Co composites

2005

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The single-step synthesis and densification of the WC-6Co cemented carbide starting from elemental powders was obtained by the spark plasma sintering (SPS) technique. The operating conditions that guarantee the complete conversion of the reactants to the desired full dense material have been identified. Specifically, under the application of 800 A and a mechanical pressure of 40 MPa for about 200 s, a product with relative density higher than 99%, hardness of 14.97 ± 0.35 GPa, and 12.5 ± 1.0 MPa m 0.5 fracture toughness was obtained. A kinetic investigation of the SPS process was also performed. It revealed that an intermediate phase, i.e., W 2 C, is the first carbide formed during the carburization process. It was observed that the synthesis and sintering stages take place simultaneously. It was also found that as the applied pulsed current intensity was augmented, the synthesis/sintering time required decreased significantly.

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Two-step synthesis of nanostructured tungsten carbide-cobalt powders

Cited by 118 publications

References 10 publications

Fabrication of ultrafine and nanocrystalline WC–Co mixtures by planetary milling and subsequent consolidations

Fabrication of ultrafine and nanocrystalline WC–Co mixtures by planetary milling and subsequent consolidations

Rapid Consolidation of Nanostructured TiCu Compound by High Frequency Induction Heating and Its Mechanical Properties

Simultaneous spark plasma synthesis and consolidation of WC/Co composites

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