Enhancement of densification and sintering behavior of tungsten material via nano modification and magnetic mixing processed under spark plasma sintering

Minh, Nguyễn Văn; Konyukhov, Yu. V.; Karunakaran, Gopalu; Ryzhonkov, D. I.; Duong, Tang; Kotov, S.; Кузнецов, Денис

doi:10.1007/s12540-017-6572-5

Cited by 11 publications

(6 citation statements)

References 26 publications

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“…High surface roughness and deviation of the shape of powder particles from rounded results in an increase of their overall surface, a decrease in their radii of curvature of the contact surfaces between them, and thus an increase in the magnitude of the Laplace forces playing the dominating role in the diffusion mass transfer processes during the sintering of the material [21,25,26,28,29]. Note also that the irregular particle shape leads to an increase in the pressing strength before the sintering [30].…”

Section: Resultsmentioning

confidence: 99%

“…In addition, during the EMT process, the treated materials undergo a high degree deformation and acquire high defectiveness of the structure. The crystal lattice may accumulate substantially higher portion of energy spent on the deformation; this energy, in turn, will be spent on the activation of sintering under heating of the material to the preset temperatures [25,28].…”

Section: Resultsmentioning

confidence: 99%

“…The EMT effect in the VLA consists in simultaneous influence of the high-energy vortex electromagnetic field and the intense mechanical impact by the ferromagnetic particles (rotating in the working zone under this field impact) on the treated material. We show that the EMT effect contributes to high degree homogenization and activation of the powder mixture [20,[24][25][26]. The EMT effect in the UAP-3 apparatus is created by the vortex electromagnetic field with the induction of 0.16 T; the field rotates at 3200 rpm.…”

Section: Methodsmentioning

confidence: 93%

“…The authors [25,26], by the example of tungsten and cobalt, reveal that the preliminary energymechanical treatment (EMT) of the initial charge in a vortex layer apparatus (VLA), combined with introduction of the metal nanoparticles as the modifiers, makes it possible to reduce the optimal sintering temperatures; to intensify, to a large extent, the compaction process; and, as a result, to obtain the compact materials with high structure-mechanical characteristics.…”

Section: New Technologies Of Production and Processing Of Materialsmentioning

confidence: 99%

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Influence of Energy-Mechanical Treatment on Structure-Mechanical Properties of Co–Cr–Mo Alloys Obtained by Spark Plasma Sintering

Minh¹,

Hiệp

Konyukhov

et al. 2021

Inorg. Mater. Appl. Res.

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We investigate the influence of preliminary energy-mechanical treatment (EMT) of the initial Co-Cr-Mo-based powders in the vortex layer of ferromagnetic bodies on the structure-mechanical properties of products obtained by the spark plasma sintering (SPS). To study the properties of the powder and the sintered samples, we employed the scanning electron microscopy (SEM), the optical microscopy, the value determination of the flexural strength and the microhardness on the Vickers scale. We show that the shorttime EMT of the powders (1-3 min) in the vortex layer of ferromagnetic bodies results in severe plastic deformation of the majority of the rounded particles of the original powder: they form particles of irregular shape including plates with increased surface roughness. As a result, this treatment influences positively their spark plasma sintering process and makes it possible to produce densely compact sintered material with a lowporosity structure. We discover that the sample preliminarily passing the 3-min EMT compacts densely during sintering (the relative density being 98.3%) and obtains improved mechanical properties (the microhardness and the flexural strength values being by 16% and 14%, respectively, higher than those for the sample without treatment). This improvement of structure-mechanical properties of the EMT-passed sintered samples results from intensification of the diffuse mass transfer during sintering due to the plastic deformation of the material, modification of the shape, the surface condition of the powder particles, and the increase of the total contact area between them. The increased surface roughness and the particle shape deviation from that regular lead to a decrease in the radii of curvature of their contact surfaces and thus an increase in the Laplace force magnitudes, playing the dominant role in the diffusion mass transfer during sintering.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 93%

Section: New Technologies Of Production and Processing Of Materialsmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Energy-Mechanical Treatment on Structure-Mechanical Properties of Co–Cr–Mo Alloys Obtained by Spark Plasma Sintering

Minh¹,

Hiệp

Konyukhov

et al. 2021

Inorg. Mater. Appl. Res.

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“…Key components of the equipment include a magnetic inductor to generate a high-power vortex magnetic field, water cooling circuit, electric resistance tube furnace, and a steel reaction chamber (45 mm dia., 350 mm length). Further details have been given elsewhere [30]. The simultaneous influence of high-power vortex magnetic field (0.16 T) and mechanical processing of sample powders with ferromagnetic stainless steel needles in the reaction chamber creates intense vortex rotation with speeds reaching 3200 rpm.…”

Section: High Energy Mechanical Treatmentmentioning

confidence: 99%

Spark Plasma Sintering of Cobalt Powders in Conjunction with High Energy Mechanical Treatment and Nanomodification

et al. 2020

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Spark plasma sintering (SPS) investigations were carried out on three sets of Co specimens: untreated, high energy mechanically (HEMT) pre-treated, and nanomodified powders. The microstructure, density, and mechanical properties of sintered pellets were investigated as a function of various pre-treatments and sintering temperatures (700–1000 °C). Fine-grained sinters were obtained for pre-treated Co powders; nano-additives tended to inhibit grain growth by reinforcing particles at grain boundaries and limiting grain-boundary movement. High degree of compaction was also achieved with relative densities of sintered Co pellets ranging between 95.2% and 99.6%. A direct co-relation was observed between the mechanical properties and densities of sintered Co pellets. For a comparable sinter quality, sintering temperatures for pre-treated powders were lower by 100 °C as compared to untreated powders. Highest values of bending strength (1997 MPa), microhardness (305 MPa), and relative density (99.6%) were observed for nanomodified HEMT and SPS processed Co pellets, sintered at 700 °C.

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Use of Iron Nanopowders and High-Energy Mechanical Treatment of Blend for Raising the Density of Articles Obtained by Spark Plasma Sintering

Nguyên

Konyukhov

Nguyen³

et al. 2021

Met Sci Heat Treat

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Enhancement of densification and sintering behavior of tungsten material via nano modification and magnetic mixing processed under spark plasma sintering

Cited by 11 publications

References 26 publications

Influence of Energy-Mechanical Treatment on Structure-Mechanical Properties of Co–Cr–Mo Alloys Obtained by Spark Plasma Sintering

Influence of Energy-Mechanical Treatment on Structure-Mechanical Properties of Co–Cr–Mo Alloys Obtained by Spark Plasma Sintering

Spark Plasma Sintering of Cobalt Powders in Conjunction with High Energy Mechanical Treatment and Nanomodification

Use of Iron Nanopowders and High-Energy Mechanical Treatment of Blend for Raising the Density of Articles Obtained by Spark Plasma Sintering

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