Nanopowders Production and Micron-Sized Powders Spheroidization in DC Plasma Reactors

Самохин, А. В.; Алексеев, Н. В.; Sinayskiy, M. A.; AlekseyAstashov,; Kirpichev, Dmitrii; Fadeev, A. A.; Tsvetkov, Yurii; Kolesnikov, A. N.

doi:10.5772/intechopen.76262

Cited by 10 publications

(6 citation statements)

References 16 publications

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“…The average particle size varied in a wide range of 8–210 nm; the particle size distributions were close to log-normal. Metal powders and oxygen-free metal compounds are capable of interactions with atmospheric oxygen [45,46].…”

Section: Methodsmentioning

confidence: 99%

“…The raw materials in the form of dispersed materials with a particle size of less than 50 µm or vapors (in the case of titanium and silicon chlorides) were injected into the plasma jet using a carrier gas. The design of the reactor provides complete evaporation of the feedstock, the target chemical interaction in the gas phase with the formation of vapors of the target product and the formation of nanoparticles by condensation and coagulation mechanisms [46,47]. The resulting nanoparticles were deposited on the water-cooled walls of the reactor with the formation of a loose, easily removable layer and partially carried with the exhaust gases into the filtration apparatus.…”

Section: Methodsmentioning

confidence: 99%

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Systematic Study of the Behavior of Different Metal and Metal-Containing Particles under the Microwave Irradiation and Transformation of Nanoscale and Microscale Morphology

et al. 2018

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In recent years, the application of microwave (MW) irradiation has played an increasingly important role in the synthesis and development of high performance nanoscale catalytic systems. However, the interaction of microwave irradiation with solid catalytic materials and nanosized structures remains a poorly studied topic. In this paper we carried out a systematic study of changes in morphology under the influence of microwave irradiation on nanoscale particles of various metals and composite particles, including oxides, carbides, and neat metal systems. All systems were studied in the native solid form without a solvent added. Intensive absorption of microwave radiation was observed for many samples, which in turn resulted in strong heating of the samples and changes in their chemical structure and morphology. A comparison of two very popular catalytic materials—metal particles (M) and supported metal on carbon (M/C) systems—revealed a principal difference in their behavior under microwave irradiation. The presence of carbon support influences the heating mechanism; the interaction of substances with the support during the heating is largely determined by heat transfer from the carbon. Etching of the carbon surface, involving the formation of trenches and pits on the surface of the carbon support, were observed for various types of the investigated nanoparticles.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Systematic Study of the Behavior of Different Metal and Metal-Containing Particles under the Microwave Irradiation and Transformation of Nanoscale and Microscale Morphology

et al. 2018

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“…Indeed, there are few scientific papers on the production of spherical particles using DC plasma in the literature, particularly for metals [12][13][14][15][16]. Itagaki et al [17] had a good degree of spheroidization in SS316L steel (commercial powder with irregular shape, average diameter 38 microns, obtained by water atomization) with experimental tests using DC plasma between 9 and 17 kW.…”

Section: Introductionmentioning

confidence: 99%

Thermal Plasma Spheroidization and Characterization of Stainless Steel Powders Using Direct Current Plasma Technology

Iovane,

Borriello,

Pandolfi

et al. 2024

Plasma

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The production of spherical powders has recently registered a boost due to the need to fabricate new printing materials for Additive Manufacturing applications, from polymers and resins to metals and ceramics. Among these materials, stainless steels powders play a leading role, since they are widely used in industry and everyday life; indeed, micron-sized spherical stainless steel powders have specific characteristics and are considered as one of the best candidates for Additive Manufacturing systems and for application in a wide range of sectors. In this paper, stainless steel 316 L powders were used to explore and identify the best process parameters of a thermal plasma process able to produce spherical powders for Additive Manufacturing applications. X-ray Diffraction, Scanning Electron Microscopy, Particle Size Distribution and Flowability analysis were performed to characterize reagents and products. Powders with a high circularity (>0.8) and improved flowability (<30 s/50 g) were successfully obtained. The collected results were compared with data available from the literature to identify the potential use of the spherical produced powders.

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“…A complex process involving both heat and mass transfer occurs during nanoparticle growth via a thermal plasma route, and it involves nucleation, condensation, coagulation, diffusion, convection, and thermophoresis. Indeed, the thermal plasma process is based on several parameters that describe the interaction of the thermo-fluid field and the concentration field of the particles [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Advanced Silicon Nanomaterial Synthesis Approach: From Reactive Thermal Plasma Jet to Nanosized Particles

et al. 2022

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A three-dimensional numerical modelling of a time-dependent, turbulent thermal plasma jet was developed to synthetize silicon nanopowder. Computational fluid dynamics and particle models were employed via COMSOL Multiphysics® v. 5.4 (COMSOL AB, Stockholm, Sweden) to simulate fluid and particle motion in the plasma jet, as well as the heat dependency. Plasma flow and particle interactions were exemplified in terms of momentum, energy, and turbulence flow. The transport of nanoparticles through convection, diffusion, and thermophoresis were also considered. The trajectories and heat transfer of both plasma jet fields, and particles are represented. The swirling flow controls the plasma jet and highly affects the dispersion of the nanoparticles. We demonstrate a decrease in both particles’ velocity and temperature distribution at a higher carrier gas injection velocity. The increase in the particle size and number affects the momentum transfer, turbulence modulation, and energy of particles, and also reduces plasma jet parameters. On the other hand, the upstream flame significantly impacts the particle’s behavior under velocity and heat transfer variation. Our findings open the door for examining thermal plasma impact in nanoparticle synthesis, where it plays a major role in optimizing the growth parameters, ensuring high quality with a low-cost technique.

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Nanopowders Production and Micron-Sized Powders Spheroidization in DC Plasma Reactors

Cited by 10 publications

References 16 publications

Systematic Study of the Behavior of Different Metal and Metal-Containing Particles under the Microwave Irradiation and Transformation of Nanoscale and Microscale Morphology

Systematic Study of the Behavior of Different Metal and Metal-Containing Particles under the Microwave Irradiation and Transformation of Nanoscale and Microscale Morphology

Thermal Plasma Spheroidization and Characterization of Stainless Steel Powders Using Direct Current Plasma Technology

Modeling of Advanced Silicon Nanomaterial Synthesis Approach: From Reactive Thermal Plasma Jet to Nanosized Particles

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