Influence of Refractory Metal Carbide Addition on Corrosion Properties of Cemented Carbides

Sutthiruangwong, Sutha; Mori, Gregor

doi:10.1081/amp-200041607

Cited by 11 publications

(7 citation statements)

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“…Samples with η-phase were selected in order to investigate the influence of η-phase on the electrochemical properties of WC-Co cemented carbides. Some investigations indicate that η-phase could improve the corrosion resistance of cemented carbides [10][11][12]. Samples WC-9Co/1S, WC-6Co/4V and WC-6Co/4S with a WC grain size dWC <200 nm can be classified as nanostructured WC-Co cemented carbides while all other samples with a WC grain size dWC > 200, near 200 nm, can be classified as near-nano cemented carbides.…”

Section: Resultsmentioning

confidence: 99%

“…Samples with η-phase were selected in order to investigate the influence of η-phase on the electrochemical properties of WC-Co cemented carbides. Some investigations indicate that η-phase could improve the corrosion resistance of cemented carbides [10][11][12] size of the starting powder. The achieved densities of all samples sintered in hydrogen are lower than the theoretical density.…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Alar

Fabijanić

2017

Metals

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Abstract:In this paper, the electrochemical corrosion resistance of near-nano and nanostructured WC-Co cemented carbides was investigated. WC powders with an average grain size d BET in the range from 95 nm to 150 nm and with an addition of vanadium carbide (VC) and chromium carbide Cr 3 C 2 as grain growth inhibitors were used as starting powders. The mixtures with 6 wt. % and 9 wt. % Co were consolidated by two different processes; sintering in hydrogen atmosphere and the sinter-HIP process. WC-Co samples were researched by direct current and alternating current techniques in the solution of 3.5% NaCl at room temperature. Corrosion parameters such as corrosion potential (E corr ), corrosion current density (j corr ) and polarization resistance (R p ) were determined by electrochemical techniques. From the conducted research, it was found that the consolidation processes and microstructural characteristics-grain growth inhibitors, grain size of the starting WC powders and η-phase-influenced the electrochemical corrosion resistance. η-phase enhanced the formation of a passive layer on the samples' surfaces, thereby reducing the tendency of the sample dissolution and increasing the stability of oxides forming therewith a passive layer on the sample surface.

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Section: Resultsmentioning

confidence: 99%

“…Samples with η-phase were selected in order to investigate the influence of η-phase on the electrochemical properties of WC-Co cemented carbides. Some investigations indicate that η-phase could improve the corrosion resistance of cemented carbides [10][11][12] size of the starting powder. The achieved densities of all samples sintered in hydrogen are lower than the theoretical density.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Alar

Fabijanić

2017

Metals

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“…The WC-5Co-1 sample with lower magnetic saturation value and consequently higher W and C content in the Co binder showed approximately 30% lower corrosion rate, which is in line with previous research. Sutthiruangwong and Mori found that the magnetic saturation related to Co binder composition plays an essential role in the corrosion properties of hardmetals [ 15 , 23 , 24 ]. F.J.J.…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…It is well-known that GGIs are dissolved and distributed among the WC phase and binder during sintering and influence characteristics of hardmetals [ 26 ]. Sutthiruangwong and Mori have found that higher corrosion resistance can be assigned to binders that experience higher chromium dissolution rates during sintering [ 23 , 24 ]. Tomlinson and Ayerst found that small additions of Cr 3 C 2 improve the electrochemical corrosion resistance of hardmetals due to the formation of Cr 2 O 3 film on the Co binder surface [ 26 ].…”

Section: Analysis and Discussionmentioning

confidence: 99%

Influence of Co Content and Chemical Nature of the Co Binder on the Corrosion Resistance of Nanostructured WC-Co Hardmetals in Acidic Solution

et al. 2021

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The electrochemical corrosion resistance of nanostructured hardmetals with grain sizes dWC < 200 nm was researched concerning Co content and the chemical nature of the Co binder. Fully dense nanostructured hardmetals with the addition of grain growth inhibitors GGIs, VC and Cr3C2, and 5 wt.%Co, 10 wt.%Co, and 15 wt.%Co were developed by a one cycle sinter-HIP process. The samples were detailly characterized in terms of microstructural characteristics and researched in the solution of H2SO4 + CO2 by direct and alternative current techniques, including electrochemical impedance spectroscopy. Performed analysis revealed a homogeneous microstructure of equal and uniform grain size for different Co contents. The importance of GGIs content adjustment was established as a key factor of obtaining a homogeneous microstructure with WC grain size retained at the same values as in starting mixtures of different Co binder content. From the conducted research, Co content has shown to be the dominant influential factor governing electrochemical corrosion resistance of nanostructured hardmetals compared to the chemical composition of the Co binder and WC grain size. Negative values of Ecorr measured for 30 min in 96% H2SO4 + CO2 were obtained for all samples indicating material dissolution and instability in acidic solution. Higher values of Rp and lower values of icorr and vcorr were obtained for samples with lower Co content. In contrast, the anodic Tafel slope increases with increasing Co content which could be attributed to more pronounced oxidation of the higher Co content samples. Previously researched samples with the same composition but different chemical composition of the binder were introduced in the analysis. The chemical composition of the Co binder showed an influence; samples with lower relative magnetic saturation related to lower C content added to the starting mixtures and more W dissolved in the Co binder during the sintering process showed better corrosion resistance. WC-5Co sample with significantly lower magnetic saturation value showed approximately 30% lower corrosion rate. WC-10Co sample with slightly lower relative magnetic saturation value and showed approximately 10% lower corrosion rate. Higher content of Cr3C2 dissolved in the binder contributed to a lower corrosion rate. Slight VC increase did not contribute to corrosion resistance. Superior corrosion resistance is attributed to W and C dissolved in the Co binder, lower magnetic saturation, or WC grain size of the sintered sample.

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“…Rare-earth elements, as useful addition agents, are doped in cemented carbides in order to improve the performance of the alloys. Many studies on developing cemented carbides with rare-earth doping have been done in the last five years to improve the service life of WC-Co cemented carbide tools [8][9][10].…”

mentioning

confidence: 99%

Effect of Cryogenic Treatment on Thermal Behavior of WC-9Ni-xCeO₂Cemented Carbides

Shi¹,

Zhou²,

Li³

et al. 2014

Materials and Manufacturing Processes

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A series of specimens of WC-9Ni-xCeO 2 cemented carbides were prepared. The influences of CeO 2 addition and cryogenic treatment (CT) on thermal conductivity, thermal diffusion coefficient, and heat capacity of the alloys were investigated using a Hot Disk thermal constant analyzer, a X-ray diffractometer (XRD), and a scanning electron microscope (SEM) coupled with an energy dispersive X-ray detector (EDS). The results indicated that with the increase in CeO 2 content in WC-9Ni-xCeO 2 cemented carbides, the thermal conductivity and thermal diffusion coefficient first increase and then decrease. The change in heat capacity of the cemented carbides, however, does not show obvious regularity. CT tends to increase the thermal conductivity, thermal diffusion coefficient, and decrease the heat capacity of WC-9Ni-xCeO 2 cemented carbides. Notably, the degree of influence of CT on thermal properties of the cemented carbides with various CeO 2 contents is obviously different. After CT, with an increase in the CeO 2 content, the variation of amplitude of thermal conductivity decreases. Similar situations also appear in the other two kinds of thermal properties.

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Influence of Refractory Metal Carbide Addition on Corrosion Properties of Cemented Carbides

Cited by 11 publications

References 11 publications

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Influence of Co Content and Chemical Nature of the Co Binder on the Corrosion Resistance of Nanostructured WC-Co Hardmetals in Acidic Solution

Effect of Cryogenic Treatment on Thermal Behavior of WC-9Ni-xCeO₂Cemented Carbides

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Influence of Refractory Metal Carbide Addition on Corrosion Properties of Cemented Carbides

Cited by 11 publications

References 11 publications

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Electrochemical Corrosion Behavior of Near-Nano and Nanostructured WC-Co Cemented Carbides

Influence of Co Content and Chemical Nature of the Co Binder on the Corrosion Resistance of Nanostructured WC-Co Hardmetals in Acidic Solution

Effect of Cryogenic Treatment on Thermal Behavior of WC-9Ni-xCeO2Cemented Carbides

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Effect of Cryogenic Treatment on Thermal Behavior of WC-9Ni-xCeO₂Cemented Carbides