Nanostructured Sintered WC–Co Hard Metals (Review)

Панов, В. С.

doi:10.1007/s11106-015-9670-2

Cited by 24 publications

(12 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This process provides a high rate of heating and sintering of a dense product in one stage and, in some cases, avoids the introduction of carbide grain growth inhibitors into the consolidated reaction mixture. For WC alloys, the SPS method, compared to traditional sintering methods, demonstrates the smallest grain size, the highest hardness, the lowest fracture toughness [ 54 ]. The application of the SPS technology makes it possible to reduce the sintering temperatures by 200 °C, which preserves the WC grain size, uses alternative molds [ 55 ], and provides reactive synthesis [ 56 ].…”

Section: Introductionmentioning

confidence: 99%

Spark Plasma Sintering of WC-Based 10wt%Co Hard Alloy: A Study of Sintering Kinetics and Solid-Phase Processes

et al. 2022

View full text Add to dashboard Cite

The paper describes the method for producing WC-10wt%Co hard alloy with 99.6% of the theoretical density and a Vickers hardness of ~1400 HV 0.5. Experimental data on densification dynamics, phase composition, morphology, mechanical properties, and grain size distribution of WC-10%wtCo using spark plasma sintering (SPS) within the range of 1000–1200 °C are presented. The high quality of the product is provided by the advanced method of high-speed powder mixture SPS-consolidation at achieving a high degree of densification with minimal calculated grain growth at 1200 °C.

show abstract

Section: Introductionmentioning

confidence: 99%

Spark Plasma Sintering of WC-Based 10wt%Co Hard Alloy: A Study of Sintering Kinetics and Solid-Phase Processes

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Hard alloys based on tungsten carbide and containing a readily fusible metallic binder (usually cobalt) lend themselves to a wide range of industrial applications [1][2][3][4][5][6][7][8][9][10][11][12]. The development of the wear-resistant cutting tools allowing for a high-speed processing of structural materials (titanium alloys, austenite corrosion-resistant steels, heat-resistant alloys, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…The development of the wear-resistant cutting tools allowing for a high-speed processing of structural materials (titanium alloys, austenite corrosion-resistant steels, heat-resistant alloys, etc.) is one promising application of the fine-grained hard alloys based on tungsten carbide [1,3,5,6,[9][10][11][12]. The fine-grained hard alloys-based tungsten carbide is interesting for applications in dies, roll drums, and engineering products, which are imposed to increased requirements of strength and wear resistance due to a successful combination of a high melting point, high hardness, fracture toughness (see Appendix A, Table A1, ), low friction coefficient, and high corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

“…The traditional structure of such alloys is comprised of α-WC tungsten monocarbide grains that are surrounded by a plastic γ-phase that is present in the form of a solid solution of carbon and tungsten in cobalt [1][2][3][4][5][6][7][8][9][10][11][12]. Depending on the under-or oversaturation of carbon relative to the equilibrium concentration (C 0 = 6.14 wt.% [1]), the WC-Co alloys may, in addition to the two main phases, contain ternary carbides (η-phase) or graphite, respectively [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Study of the Impact of Graphite on the Kinetics of SPS in Nano- and Submicron WC-10%Co Powder Compositions

et al. 2021

View full text Add to dashboard Cite

This study investigates the impact of carbon on the kinetics of the spark plasma sintering (SPS) of nano- and submicron powders WC-10wt.%Co. Carbon, in the form of graphite, was introduced into powders by mixing. The activation energy of solid-phase sintering was determined for the conditions of isothermal and continuous heating. It has been demonstrated that increasing the carbon content leads to a decrease in the fraction of η-phase particles and a shift of the shrinkage curve towards lower heating temperatures. It has been established that increasing the graphite content in nano- and submicron powders has no significant effect on the SPS activation energy for “mid-range” heating temperatures, QS(I). The value of QS(I) is close to the activation energy of grain-boundary diffusion in cobalt. It has been demonstrated that increasing the content of graphite leads to a significant decrease in the SPS activation energy, QS(II), for “higher-range” heating temperatures due to lower concentration of tungsten atoms in cobalt-based γ-phase. It has been established that the sintering kinetics of fine-grained WC-Co hard alloys is limited by the intensity of diffusion creep of cobalt (Coble creep).

show abstract

“…Nanoscale tungsten carbide WC powders are of practical interest for creating nanostructured hard alloys with enhanced physical and mechanical characteristics, wearresistant nanostructured coatings, electro-catalysts in fuel cells, metal melt modifiers [1][2][3][4][5][6][7][8]. An efficient method for producing tungsten carbide nanopowders is a plasma-chemical synthesis of a multicomponent W-C powder nanocomposite with its subsequent heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Tungsten Carbide Nanopowder Synthesis Under the Exposure of 24 GHZ Gyrotron Radiation on the Nanocomposite of the W-C System Obtained in a Thermal Plasma

Vodopyanov

Самохин

Aleksev

et al. 2019

Proceedings 17th International Conference on Microwave and High Frequency Heating

View full text Add to dashboard Cite

Nanoscale tungsten carbide WC powders are of practical interest for the creation of nanostructured hard alloys with enhanced physical and mechanical characteristics, wear-resistant nanostructured coatings, electrocatalysts in fuel cells, metal melt modifiers [1]. An efficient method for producing tungsten carbide nanopowder is a plasma-chemical synthesis of a multi-component powder nanocomposite system W-C in combination with its subsequent heat treatment [2]. Experimental studies have shown the possibility of producing tungsten carbide WC nanopowder by this method. But the transformation of the nanocomposite in the target product is accompanied by an increase in the size of nanoparticles. We assume that this growth is associated with prolonged heating (several hours) in an electric furnace at a temperature of about 1000 ° C. This time is necessary for the complete transformation of the nanocomposite into the target product. The aim of the work was an experimental study of the formation of tungsten carbide nanopowder WC when processing a multi-component powder nanocomposite system W-C in an electromagnetic field with a frequency of 24 GHz. A multipurpose gyrotron system with a nominal power of 7 kW with at a frequency of 24 GHz was used for the experiments. The microwave application system described in [3]. The powders were treated in an argon flow. The experiments were carried varying exposure time and microwave power. The samples of nanopowders obtained in the experiments were analyzed using the following methods: XRD, TEM, SEM, BET, LDA, CEA. It was established that microwave radiation with a frequency of 24 GHz allows heating samples of powders to a temperature of 1100-1200 C almost immediately (after 1-2 s) after switching on. The tungsten carbide WC is formed in a few minutes under the exposure to microwave radiation of the original W-C nanocomposite system. There is only a slight increase in the average particle size from 20 to 30 nm. The investigations showed that the synthesis of tungsten carbide WC under the microwave heating as compared to conventional heating in an electric furnace may be carried out for significantly less time while maintaining the particles in the nanometer range.The work was carried out within the framework of the Program #14 "Physical chemistry of adsorption phenomena and actinide nanoparticles" of the Presidium of the Russian Academy of Sciences.References Z. Zak Fang, Xu Wang, et al. Int. Journal of Refractory Metals & Hard Materials, 2009, 27, 288–299.Samokhin A., Alekseev N., et al. Plasma Chem. Plasma Proc., 2013, 33, 605–616.Samokhin A., Alekseev N., et al. J. Nanotechnol. Eng. Med., 2015, 6, 011008.

show abstract

Nanostructured Sintered WC–Co Hard Metals (Review)

Cited by 24 publications

References 8 publications

Spark Plasma Sintering of WC-Based 10wt%Co Hard Alloy: A Study of Sintering Kinetics and Solid-Phase Processes

Spark Plasma Sintering of WC-Based 10wt%Co Hard Alloy: A Study of Sintering Kinetics and Solid-Phase Processes

A Study of the Impact of Graphite on the Kinetics of SPS in Nano- and Submicron WC-10%Co Powder Compositions

Tungsten Carbide Nanopowder Synthesis Under the Exposure of 24 GHZ Gyrotron Radiation on the Nanocomposite of the W-C System Obtained in a Thermal Plasma

Contact Info

Product

Resources

About