A comparative study of the hot pressing and spark plasma sintering of Al2O3–ZrO2–Ti(C,N) powders

Чувильдеев, В. Н.; Болдин, М. С.; Dyatlova, Ya. G.; Rumyantsev, V. I.; Ordan’yan, S. S.

doi:10.1134/s0020168515090034

Cited by 43 publications

(6 citation statements)

References 12 publications

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“…It means that one has to use another approach to estimate the sintering activation energy in the higher temperature range. According to [62], one can estimate the activation energy at this stage using the model of diffusion dissolving of pores located near the grain boundaries in the fine-grained materials. The correctness of application of this procedure was demonstrated earlier in [45,60,63,64].…”

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

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“…According to [105,106], an estimation of the sintering activation energy can be made with the model of diffusion-based dissolution of pores, which are found near grain boundaries in UFG materials. In order to calculate the activation energy, the shrinkage value is first converted into the densification value using the following formula: ρ(T) = ρ exp L max /(L 0− L(T)), where L 0 is the initial press height corresponding to 50% of theoretical density, L max is the full specimen shrinkage after sintering, and ρ exp is the experimentally measured density of the specimen (hydrostatic weighing).…”

Section: Analysis Of the Kinetics Of Non-isothermal Sintering Of Nano...mentioning

confidence: 99%

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

et al. 2021

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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).

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“…SPS is based on the idea of high-rate heating (up to 2500 о С/min) of materials (powders, bulk materials, composites) in vacuum or inert atmosphere by means of passing millisecond highpower pulses (up to 5000 A) of direct pulse current through samples and simultaneous pressure application [10]. Such a combination enables high-density structures in metals, alloys and ceramics [11][12][13]. Advantages of SPS technology include an opportunity to reduce optimal sintering temperature for UFG materials [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Such a combination enables high-density structures in metals, alloys and ceramics [11][12][13]. Advantages of SPS technology include an opportunity to reduce optimal sintering temperature for UFG materials [11][12][13][14]. High heating rates and an opportunity to ensure significant diffusion acceleration at reduced heating temperatures are essential to limit the process of grain growth and preservation of the original UFG structure in materials.…”

Section: Introductionmentioning

confidence: 99%

The use of Spark Plasma Sintering method for high-rate diffusion welding of high-strength UFG titanium alloys

Нохрин

Чувильдеев

Болдин

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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A comparative study of the hot pressing and spark plasma sintering of Al2O3–ZrO2–Ti(C,N) powders

Cited by 43 publications

References 12 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

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

The use of Spark Plasma Sintering method for high-rate diffusion welding of high-strength UFG titanium alloys

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