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

Lantcev, E A; Нохрин, А. В.; Малехонова, Н. В.; Болдин, М. С.; Чувильдеев, В. Н.; Blagoveshchenskiy, Yuriy; Исаева, Н. В.; Андреев, П. В.; Smetanina, K. E.; Мурашов, А. А.

doi:10.3390/ceramics4020025

Cited by 12 publications

(19 citation statements)

References 101 publications

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“…Note also that the decreasing of the grain sizes would lead to an essential increase in the creep rate in the metal materials [56]. Note also that Coble creep is one of main compaction mechanisms in SPS of WC [57], WC-Co [58,59], and YAG:Nd-W [60] nanopowders.…”

Section: Discussionmentioning

confidence: 99%

Effect of High Energy Ball Milling Time on the Density and Mechanical Properties of W-7%Ni-3%Fe Alloy

Нохрин¹,

Малехонова²,

Чувильдеев³

et al. 2023

Preprint

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The present work was aimed at the investigation of effect of High Energy Ball Milling (HEBM) time on the sintering kinetics, structure, and properties of heavy tungsten alloy (HTA) W-7%Ni-3%Fe. The HTA samples were obtained from the nanopowders (20-80 nm) by conventional liquid phase sintering (LPS) in hydrogen and by Spark Plasma Sintering (SPS) in vacuum. The HTA density was shown to depend on the HEBM time non-monotonously that originates from the formation of non-equilibrium solid solutions in the W-Ni-Fe systems during HEBM. The SPS kinetics of the HTA nanopowders was shown to have a two-stage character, the intensity of which depends on the Coble diffusion creep rate and on the intensity of diffusion of the tungsten atoms in the crystal lattice of the -phase. The kinetics of sintering of the initial submicron powders have a single-stage character originating from the intensity of the grain boundary diffusion in the -phase. The dependencies of the hardness and of the yield strength on the grain sizes were found to obey the Hall-Petch relation. The hardness, strength, and dynamic strength in the compression tests of the fine-grained tungsten alloys obtained by SPS and LPS were studied.

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Section: Discussionmentioning

confidence: 99%

Effect of High Energy Ball Milling Time on the Density and Mechanical Properties of W-7%Ni-3%Fe Alloy

Нохрин¹,

Малехонова²,

Чувильдеев³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…It is also notable that a decrease in the grain sizes would lead to an essential increase in the creep rate in the metal materials [74]. It is also notable that Coble creep is one of the main compaction mechanisms in SPS of WC [75], WC-Co [76,77], and YAG:Nd-W [78] nanopowders.…”

Section: Discussionmentioning

confidence: 99%

Effect of High-Energy Ball Milling Time on the Density and Mechanical Properties of W-7%Ni-3%Fe Alloy

Нохрин

Малехонова

Чувильдеев

et al. 2023

Metals

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The present work was aimed at the investigation of the effect of high-energy ball milling (HEBM) time on the sintering kinetics, structure, and properties of the heavy tungsten alloy (HTA) W-7%Ni-3%Fe. The HTA samples were obtained from nanopowders (20–80 nm) using conventional liquid-phase sintering (LPS) in hydrogen and using spark plasma sintering (SPS) in vacuum. The HTA density was shown to depend non-monotonously on the HEBM time that originates from the formation of nonequilibrium solid solutions in the W-Ni-Fe systems during HEBM. The SPS kinetics of the HTA nanopowders was shown to have a two-stage character, the intensity of which depends on the Coble diffusion creep rate and on the intensity of diffusion of the tungsten atoms in the crystal lattice of the γ-phase. The kinetics of sintering of the initial submicron powders has a single-stage character originating from the intensity of the grain boundary diffusion in the γ-phase. The dependencies of the hardness and of the yield strength on the grain sizes were found to obey the Hall–Petch relation. The hardness, strength, and dynamic strength in the compression tests of the fine-grained tungsten alloys obtained using SPS and LPS were studied.

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“…Благодаря сочетанию высокой прочности, твердости и износостойкости твердые сплавы находят широкое применение в промышленности [1][2][3][4][5][6][7][8][9]. Получение из порошков WC-Co и WC-TiC-Co ультрамелкозернистых порошков и твердых сплавов с высокой твердостью и износостойкостью является важным направлением порошковой металлургии в настоящее время [3,[10][11][12][13][14][15][16].…”

Section: Introductionunclassified

Influence of Liquid Composition and Discharge Energy on Process Performance, Composition, and Properties of Particles Formed During Electric Discharge Erosion of WC-5TiC-10Co Alloy

Dvornik¹,

Burkov²,

Mihailenko³

et al. 2023

EOM

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Increasing the hardness and wear resistance of powder alloys and coatings through the use of ultrafine-grained powders and metastable phases is a promising way in powder metallurgy. This paper presents the results of the studies of the process of obtaining ultrafine powders by the electric discharge erosion of the cemented carbide waste WC-5TiC-10Co on a special installation. An empirical model that describes the dependence of the productivity of the process on the discharge energy and properties of the liquid is provided. The dependence of the chemical and phase compositions of the obtained powder on the composition of the used liquid and specific energy consumption has been investigated. The effect of the discharge energy on the morphological composition and average particle diameter has been examined. It is revealed that the formation of a metastable solid solution (W, Ti)C and a decrease in the concentration of cobalt induce an increase in the hardness of the resulting spherical particles from 1410HV0.05 to 2540HV0.05.

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

Cited by 12 publications

References 101 publications

Effect of High Energy Ball Milling Time on the Density and Mechanical Properties of W-7%Ni-3%Fe Alloy

Effect of High Energy Ball Milling Time on the Density and Mechanical Properties of W-7%Ni-3%Fe Alloy

Effect of High-Energy Ball Milling Time on the Density and Mechanical Properties of W-7%Ni-3%Fe Alloy

Influence of Liquid Composition and Discharge Energy on Process Performance, Composition, and Properties of Particles Formed During Electric Discharge Erosion of WC-5TiC-10Co Alloy

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