Location of VC in VC, Cr3C2 codoped WC–Co cermets by HREM and EELS

Lay, S.; Hamar‐Thibault, S.; Lackner, A. M.

doi:10.1016/s0263-4368(01)00071-3

Cited by 142 publications

(81 citation statements)

References 4 publications

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“…Segregation of V and Cr was observed at the WC/Co and WC/WC interfaces of all specimens examined in this study which, based on reports by Lay et al, 10) suggests that the segregated phase is most likely (V,W,Cr)C. We believe that the segregation layer does not exist above the liquidus Table 3.…”

Section: Discussionsupporting

confidence: 66%

Segregation of Dopants at WC/Co and WC/WC Interfaces in Solid-State-Sintered WC-VC-Cr3C2-Co Cemented Carbides

Kawakami

Kitamura

2015

Mater. Trans.

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The segregation of V and Cr at WC/Co and WC/WC interfaces in ultrafine-grained WC-0.7VC-1.4Cr 3 C 2 -10Co (mass%) cemented carbides produced through solid-state sintering and semi-sintering was investigated. This segregation was compared against that of a liquid-statesintered specimen to elucidate the mechanism by which WC grain growth is inhibited by V and Cr. The V and Cr were found to segregate at the WC/Co and WC/WC interfaces during solid-state sintering and semi-sintering, but no differences were observed in the V and Cr concentrations at the interfaces among the liquid-state-sintered, solid-state-sintered and semi-sintered specimens. Furthermore, these concentrations were unchanged by quenching of the solid-state-sintered specimen. From these results, it was concluded that (V,W,Cr)C x segregation layers are stably formed at the WC/Co and WC/WC interfaces at a temperature below the solidus of the Co phase, but almost dissolve in the liquid Co phase once the temperature exceeds its liquidus. Thus, the (V,W,Cr)C x segregation layers observed at the WC/Co and WC/WC interfaces at room temperature are formed during the cooling that follows the liquid-state sintering. This supports the finding that WC grain growth is inhibited by the adsorption of dopant atoms onto steps/kinks on the WC surface during liquid-state sintering, as well as by the segregation layers formed on the WC surface during solid-state sintering.

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Section: Discussionsupporting

confidence: 66%

Segregation of Dopants at WC/Co and WC/WC Interfaces in Solid-State-Sintered WC-VC-Cr3C2-Co Cemented Carbides

Kawakami

Kitamura

2015

Mater. Trans.

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“…8) In VC-doped alloy, the morphology of WC grains changes largely as previously reported by some research groups. 8,10,13) The WC/Co interfaces exhibit multi faceting features as seen in the image. The multi facets consist of two usual habits such as (0001) and f10 1 10g.…”

Section: Liquid-phase Sintered Alloymentioning

confidence: 99%

“…In addition, both habits are atomically flat with no multi type facets, which are often observed in VC-doped alloy as in the previous reports. 8,10) The corners of WC grains tend to show a round shape. These features of WC/Co interfaces and WC grain shape are very similar to those of undoped alloy.…”

Section: Liquid-phase Sintered Alloymentioning

confidence: 99%

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High Resolution Electron Microscopy Study in ZrC-Doped WC-12 mass%Co Alloys

et al. 2009

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Microstructures in ZrC-doped WC-Co alloys, which were prepared by liquid-phase and solid-phase sintering, were investigated mainly by high-resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectrometry (EDS). HRTEM study has revealed that multi facet structures, which are often observed in VC-doped alloys, were not formed in ZrC-doped alloys. In addition, the segregation of Zr at WC/Co interfaces could not be detected by EDS analysis even with nano size electron probe. Doped ZrC was found to exist as other carbide grains without dissolving into -phase, i.e., Co phase by EDS-mapping performed for liquid-phase sintered alloys. In the case of liquid-phase sintering, the inhibition effect for the grain growth caused by ZrC-doping was confirmed to be very small as previously reported. In contrast, it was found that ZrC-doping largely retards WC grain growth in the case of solid-phase sintering. The retardation of WC grain growth observed in solid-phase sintered alloys was considered to be closely related to a low sinterbility due to a low wettability between Co and ZrC.

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“…15,16) However, none of those mechanisms clearly explains the growth inhibition or the roles of VC and Cr 3 C 2 . The goal of this study was to develop a better understanding of the process by which some phases are formed and subsequently to investigate the role of additives on WC particle growth.…”

Section: Introductionmentioning

confidence: 99%

Growth Inhibition of Nano WC particles in WC-Co Alloys during Liquid-Phase Sintering

Seo¹,

Kang²,

Lavernia³

2003

Mater. Trans.

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WC-10Co-xVC alloys were produced using two different sizes of WC powders (200 nm and 4.4 mm) via planetary milling and a liquidphase sintering technique. When VC was added to the WC-Co alloys, the growth of WC particles was effectively suppressed. However, this process was dependent on the amount of additive used. Since the average WC particle size became less than 1 mm, the system experienced a significant loss in carbon, resulting in the formation of an undesirable phase. The goal of this study was to determine the role of VC in controlling growth and to verify its effectiveness as a function of average WC size and inhibitor content. It was found from XRD and HREM studies that the (W,M)C phase was formed in WC-10Co-xVC-C systems. The effect of V or VC on the solubility of W in the Co matrix was also examined using HREM/EDS. The findings indicate that the presence of VC tends to reduce the solubility of W in a Co melt, thus inhibiting the dissolution and growth of WC.

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Location of VC in VC, Cr3C2 codoped WC–Co cermets by HREM and EELS

Cited by 142 publications

References 4 publications

Segregation of Dopants at WC/Co and WC/WC Interfaces in Solid-State-Sintered WC-VC-Cr<sub>3</sub>C<sub>2</sub>-Co Cemented Carbides

Segregation of Dopants at WC/Co and WC/WC Interfaces in Solid-State-Sintered WC-VC-Cr<sub>3</sub>C<sub>2</sub>-Co Cemented Carbides

High Resolution Electron Microscopy Study in ZrC-Doped WC-12 mass%Co Alloys

Growth Inhibition of Nano WC particles in WC-Co Alloys during Liquid-Phase Sintering

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