An experimental study of the sintering of nanocrystalline WC–Co powders

Fang, Zhigang Zak; Maheshwari, P.; Wang, X.; Sohn, Hong Yong; Griffo, Anthony; Riley, R.E.

doi:10.1016/j.ijrmhm.2005.04.014

Cited by 107 publications

(50 citation statements)

References 13 publications

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“…In both processes, a microstructural inhomogeneity can be appreciated, which is typical for the solid phase sintering, with Co segregations and lack of wettability. This fact improves the interactions between carbides, promoting coalescence phenomena that are responsible for the grain growth [35,36].…”

Section: Methodsmentioning

confidence: 99%

Fabrication of full density near-nanostructured cemented carbides by combination of VC/Cr3C2 addition and consolidation by SPS and HIP technologies

Bonache

Salvador

Fernández

et al. 2011

International Journal of Refractory Metals and Hard Materials

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 AbstractThe aim of present work is to study the effect of VC and/or Cr 2 C 3 in densification, microstructural development and mechanical behavior of nanocrystalline WC12wt.%Co powders when they are sintered by spark plasma sintering (SPS) and hot isostatic pressing (HIP). The results were compared to those corresponding to conventional sintering in vacuum. The density, microstructure, X-ray diffraction, hardness and fracture toughness of the sintered materials were evaluated. Materials prepared by SPS exhibits full densification at lower temperature (1100 ºC) and a shorter stay time (5 min), allowing the grain growth control. However, the effect of the inhibitors during SPS process is considerably lower than in conventional sintering.

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Section: Methodsmentioning

confidence: 99%

Fabrication of full density near-nanostructured cemented carbides by combination of VC/Cr3C2 addition and consolidation by SPS and HIP technologies

Bonache

Salvador

Fernández

et al. 2011

International Journal of Refractory Metals and Hard Materials

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“…e pressure acting on the powders when the temperature increases (to the constant sintering temperature) improves the densification and reduces the voids between the consolidated powders. In general, for the densification of the nanocrystalline material, the consolidation temperature can be significantly lower compared to the microcrystalline material [13,25]. e ceramic phase in the tantalum-based composites can suppress grain growth during consolidation.…”

Section: Discussionmentioning

confidence: 99%

“…In these processes of consolidation, both the pressure and the temperature increase simultaneously, which results in a shortening of the time for which the material is kept at a given high sintering temperature, and this process can be done at a significantly lower consolidation temperature compared to conventional pressureless sintering [12]. Both factors (temperature and time) are crucial for the reduction of the grain growth and the maintenance of the nanostructure or ultrafine structure [13]. Differences in the absence of wetting and the densities of the melted metal and ceramic components result in their segregation, which requires special casting techniques [14].…”

Section: Introductionmentioning

confidence: 99%

Formation and Properties of the Ta‐Y₂O₃, Ta‐ZrO₂, and Ta‐TaC Nanocomposites

Jakubowicz

Sopata

Adamek

et al. 2018

Advances in Materials Science and Engineering

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e nanocrystalline tantalum-ceramic composites were made using mechanical alloying followed by pulse plasma sintering (PPS). e tantalum acts as a matrix, to which the ceramic reinforced phase in the concentration of 5, 10, 20, and 40 wt.% was introduced. Oxides (Y 2 O 3 and ZrO 2 ) and carbides (TaC) were used as the ceramic phase. e mechanical alloying results in the formation of nanocrystalline grains. e subsequent hot pressing in the mode of PPS results in the consolidation of powders and formation of bulk nanocomposites. All the bulk composites have the average grain size from 40 nm to 100 nm, whereas, for comparison, the bulk nanocrystalline pure tantalum has the average grain size of approximately 170 nm. e ceramic phase refines the grain size in the Ta nanocomposites. e mechanical properties were studied using the nanoindentation tests. e nanocomposites exhibit uniform load-displacement curves indicating good integrity and homogeneity of the samples. Out of the investigated components, the Ta-10 wt.% TaC one has the highest hardness and a very high Young's modulus (1398 HV and 336 GPa, resp.). For the Ta-oxide composites, Ta-20 wt.% Y 2 O 3 has the highest mechanical properties (1165 HV hardness and 231 GPa Young's modulus).

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“…Once the WC grains have attained their typical faceted shape (which can happen already in solid-state sintering for small initial grain sizes 68 ), the most important growth mechanism has been argued to be defect assisted, 69 but also two-dimensional (2D) nucleation has been proposed. [70][71][72] In both mechanisms, growth proceeds by atoms from the binder attaching at surface steps of atomic height.…”

Section: Wc Grain Growth and V Segregationmentioning

confidence: 99%

First-principles study of an interfacial phase diagram in the V-doped WC-Co system

Johansson

Wahnström

2012

Phys. Rev. B

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We present a method of determining an interfacial phase diagram using density functional theory calculations for interface energetics. Cluster expansions based on these calculations are used in Monte Carlo simulations to obtain configurational free energies. The method is applied to study the segregation of V to the WC(0001)/Co interface and to construct the corresponding interface diagram, a "complexion" phase diagram. By CALPHADtype analysis for the adjoining bulk phases, a connection with real materials is made. We find that, in equilibrium, the interface contains a thin V-rich film for a wide range of temperatures and chemical potentials of V corresponding to V additions below the (V,W)C x solubility limit. The results are compared with available experimental data, and implications of the strong segregation of V for the sintering process of V-doped WC-Co are discussed.

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An experimental study of the sintering of nanocrystalline WC–Co powders

Cited by 107 publications

References 13 publications

Fabrication of full density near-nanostructured cemented carbides by combination of VC/Cr3C2 addition and consolidation by SPS and HIP technologies

Fabrication of full density near-nanostructured cemented carbides by combination of VC/Cr3C2 addition and consolidation by SPS and HIP technologies

Formation and Properties of the Ta‐Y₂O₃, Ta‐ZrO₂, and Ta‐TaC Nanocomposites

First-principles study of an interfacial phase diagram in the V-doped WC-Co system

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An experimental study of the sintering of nanocrystalline WC–Co powders

Cited by 107 publications

References 13 publications

Fabrication of full density near-nanostructured cemented carbides by combination of VC/Cr3C2 addition and consolidation by SPS and HIP technologies

Fabrication of full density near-nanostructured cemented carbides by combination of VC/Cr3C2 addition and consolidation by SPS and HIP technologies

Formation and Properties of the Ta‐Y2O3, Ta‐ZrO2, and Ta‐TaC Nanocomposites

First-principles study of an interfacial phase diagram in the V-doped WC-Co system

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Formation and Properties of the Ta‐Y₂O₃, Ta‐ZrO₂, and Ta‐TaC Nanocomposites