Interfaces between Model Co-W-C Alloys with Various Carbon Contents and Tungsten Carbide

Konyashin, I.; Зайцев, А. А.; Meledin, Alexander; Mayer, Joachim; Логинов, П.А.; Левашов, Е. А.; Ries, B.

doi:10.3390/ma11030404

Cited by 11 publications

(3 citation statements)

References 9 publications

(15 reference statements)

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“…The good properties were related to the elimination of mixed carbides (M 6 C and M 12 C) and WC/WC interfaces in structure. Some researchers like Konyashin et al [18] have studied the Co/WC interfaces. In this paper, we presented a developed Co-20% WC compound with good wear behaviour and performance.…”

Section: Introductionmentioning

confidence: 99%

Microstructural, mechanical and tribological characterization of Co–20 wt% WC composite elaborated by solid-phase sintering of Co–W–C powders mixture

Aouchiche

Alhussein

Nechiche

et al. 2021

Tribology - Materials, Surfaces & Interfaces

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In this paper, we present the synthesis of a Co-WC compound with 80% of cobalt in a single step by sintering powders compacted and previously milled for 10 h. The purpose of this work is to obtain a fine structure avoiding the formation of mixed carbides and reducing the WC/WC interfaces. The original powder mixture contained 80 wt% Co, 13 wt% W and 7 wt% C. The Co-20% WC metal matrix composite was successfully synthesized with a very fine and homogeneous structure. It presented a good wear resistance and showed that increasing the applied load from 5 to 10 N led to decrease the friction coefficient from 0.52 to 0.35 (sample speed = 10 cm/s) and from 0.90 to 0.61 (sample speed = 20 cm/s). The hardness and Young's modulus of Co phase and WC grains, measured by nanoindentation technique, were 0.78/79.9 and 5.78/164.6 GPa, respectively.

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Section: Introductionmentioning

confidence: 99%

Microstructural, mechanical and tribological characterization of Co–20 wt% WC composite elaborated by solid-phase sintering of Co–W–C powders mixture

Aouchiche

Alhussein

Nechiche

et al. 2021

Tribology - Materials, Surfaces & Interfaces

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“…Of these, the cermet coatings, represented by WC-Co, exhibit better corrosion resistance and wear resistance. Simultaneously, owing to the existence of metal binder, the coating has better toughness under the premise of maintaining high hardness [7][8][9][10]. Its main anti-corrosion principle is to form an aluminum-rich phase as a protective film to isolate the molten zinc aluminum.…”

Section: Introductionmentioning

confidence: 99%

In Situ Ternary Boride: Effects on Densification Process and Mechanical Properties of WC-Co Composite Coating

Bao

Liu

et al. 2020

Materials

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New coatings resistant to corrosion in high-temperature molten zinc aluminum were prepared by supersonic flame spraying of various composite powders. These composite powders were prepared by mixing, granulation, and heat treatment of various proportions of Mo–B4C powder and WC and Co powder. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF–STEM), energy dispersive X-ray spectroscopy (EDS), and mechanical analysis were used to study the effects of Mo–B4C on the microstructure, phase, porosity, bonding strength, and elastic modulus of the composite powder and coating. Results show that the addition of an appropriate quantity of Mo–B4C reacts with Co to form ternary borides CoMo2B2 and CoMoB. Ternary boride forms a perfect continuous interface, improving the mechanical properties and corrosion resistance property of the coating. When the amount of Mo–B4C added was 35.2%, the mechanical properties of the prepared coating reached optimal values: minimum porosity of 0.31 ± 0.15%, coating bonding strength of 77.81 ± 1.77 MPa, nanoindentation hardness of 20.12 ± 1.85 GPa, Young’s modulus of 281.52 ± 30.22 GPa, and fracture toughness of 6.38 ± 0.45 MPa·m1/2.

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“…Fabijanić et al [20] found that the addition of 0.45% Cr 3 C 2 in WC contributed to microstructure homogeneity and reduced discontinuous and continuous grain growth, which increased Vickers hardness by approximately 70 HV and fracture toughness by approximately 0.15 MN/m 3/2 . Konyashin et al [21] observed the phenomenon of precipitating fine grains of WC and η-phase in the interface region of a binder model alloy with low carbon content. Armstrong [22] found that the mean free path dimensions of Co binder were important in affecting the composite material toughness properties and fracturing behavior of internal thermal micro-stresses.…”

Section: Introductionmentioning

confidence: 99%

Effect of Graphene and Carbon Nanotubes on the Thermal Conductivity of WC–Co Cemented Carbide

Chen¹,

Xiao

et al. 2019

Metals

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In recent years, it has been found that the service life of cemented carbide shield machine tools used in uneven soft and hard strata is substantially reduced in engineering practice. The study found that thermal stress is the main reason for the failure of cemented carbide shield tunneling tools when shield tunneling is carried out in uneven soft and hard soil. To maintain the hardness of cemented carbide, improving the thermal conductivity of the shield machine tool is of great importance for prolonging its service life and reducing engineering costs. In this study, graphene and carbon nanotubes were mixed with WC–Co powder and sintered by spark plasma sintering (SPS). The morphology was observed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The Rockwell hardness, bending strength, and thermal conductivity of the samples were tested. The results show that adding a small amount of graphene or carbon nanotubes could increase the bending strength of the cemented carbide by approximately 50%, while keeping the hardness of the cemented carbide constant. The thermal conductivity of the cemented carbide could be increased by 10% with the addition of 0.12 wt % graphene alone.

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Interfaces between Model Co-W-C Alloys with Various Carbon Contents and Tungsten Carbide

Cited by 11 publications

References 9 publications

Microstructural, mechanical and tribological characterization of Co–20 wt% WC composite elaborated by solid-phase sintering of Co–W–C powders mixture

Microstructural, mechanical and tribological characterization of Co–20 wt% WC composite elaborated by solid-phase sintering of Co–W–C powders mixture

In Situ Ternary Boride: Effects on Densification Process and Mechanical Properties of WC-Co Composite Coating

Effect of Graphene and Carbon Nanotubes on the Thermal Conductivity of WC–Co Cemented Carbide

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