Production of spherical powders on the basis of group IV metals for additive manufacturing

Kotlyarov, V. I.; Beshkarev, V. T.; Kartsev, V. E.; Ivanov, V. V.; Гасанов, А. А.; Yuzhakova, E. A.; Самохин, А. В.; Fadeev, A. A.; Алексеев, Н. В.; Sinayskiy, M. A.; Tretyakov, E. V.

doi:10.1134/s2075113317030157

Cited by 13 publications

(9 citation statements)

References 2 publications

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“…with [21] can be due to the lognormal distribution of the particles residence time in the growth zone. For the nanoparticles syntheses ( Table 1) where formation of particles occurs through various macro mechanisms, it has been experimentally established that the average size of the nanoparticles increases with increasing concentration of the gas component precursor [22][23][24][25][26][27][28][29][30].…”

Section: Powder Technologymentioning

confidence: 99%

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

Самохин¹,

Алексеев²,

Sinayskiy³

et al. 2018

Powder Technology

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Technology for metal and inorganic compounds nanopowders production in DC arc plasma reactors has been developed. Similar DC arc plasma reactors were used for micronsized powders spheroidization. Results of experimental studies are presented. Formation of nanoparticles via different mechanisms as well as mass transfer of nanopowders to the reactor cooling surfaces are discussed. Heat flux distribution along the reactor wall and its influence on the evolution of nanoparticles in the deposited layer are investigated. Effects of plasma torch and confined jet reactor operation parameters on the granulometric, phase and chemical composition of nanopowders are discussed. Potential of the confined plasma jet apparatus for micron-sized metal and composite particles spheroidization is demonstrated.

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Section: Powder Technologymentioning

confidence: 99%

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

Самохин¹,

Алексеев²,

Sinayskiy³

et al. 2018

Powder Technology

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“…An effective method for producing powders with a spherical particle shape is the processing of powders consisting of particles with an irregular shape in a flow of thermal plasma of electric discharges where the particles melt and become spherical due to surface tension forces. Plasma processes of spheroidization, the studies of which were started in the second half of the last century [ 7 , 8 ], are now widely used for processing metal powders [ 9 , 10 , 11 , 12 , 13 , 14 ]. However, the production of powders of WC-Co hard metals with a spherical particle shape in plasma processes has been studied only in a very limited number of works.…”

Section: Introductionmentioning

confidence: 99%

Preparation of W-C-Co Composite Micropowder with Spherical Shaped Particles Using Plasma Technologies

et al. 2021

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The possibility of obtaining composite micropowders of the W-C-Co system with a spherical particle shape having a submicron/nanoscale internal structure was experimentally confirmed. In the course of work carried out, W-C-Co system nanopowders with the average particle size of approximately 50 nm were produced by plasma-chemical synthesis. This method resulted in the uniform distribution of W, Co and C among the nanoparticles of the powder in the nanometer scale range. Dense microgranules with an average size of 40 microns were obtained from the nanopowders by spray drying. The spherical micropowders with an average particle size of 20 microns were received as a result of plasma treatment of 25.36 microns microgranule fraction. The spherical particles obtained in the experiments had a predominantly dense microstructure and had no internal cavities. The influence of plasma treatment process parameters on dispersity, phase, and chemical composition of spherical micropowders and powder particles microstructure has been established.

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“…One process of particle morphology modification is the rounding of irregular-shaped particles (also called spheronization). This process has been employed for the production of spherical particles of metals [7][8][9][10][11], ceramics [12], polymers [5,6,[13][14][15][16][17] and pharmaceutical products [18]. Depending on the mechanical and thermal properties of the particles, rounding can be achieved by mechanical and thermal approaches.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the thermal properties of the material to be rounded different heat sources and levels of heat are required. Rounding of particles has been achieved using thermal plasmas [8,9] and plasma rotating electrodes [10,11], flames [12] and pulsed electron beam irradiation [21], using different reactor configurations.…”

Section: Introductionmentioning

confidence: 99%

Particle Lagrangian CFD Simulation and Experimental Characterization of the Rounding of Polymer Particles in a Downer Reactor with Direct Heating

et al. 2021

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Polypropylene (PP) powders are rounded at different conditions in a downer reactor with direct heating. The particles are fed through a single central tube, while the preheated sheath gas is fed coaxially surrounding the central aerosol jet. The influence of the process parameters on the quality of the powder product in terms of particle shape and size is analyzed by correlating the experimental results with the flow pattern, residence time distribution of the particles and temperature distribution predicted by computational fluid dynamics (CFD) simulations. An Eulerian–Lagrangian numerical approach is used to capture the effect of the particle size distribution on the particle dynamics and the degree of rounding. The simulation results reveal that inlet effects lead to inhomogeneous particle radial distributions along the total length of the downer. The configuration of particle/gas injection also leads to fast dispersion of the particles in direction of the wall and to particle segregation by size. Broad particle residence time distributions are obtained due to broad particle size distribution of the powders and the particles dispersion towards the wall. Lower mass flow ratios of aerosol to sheath gas are useful to reduce the particle dispersion and produce more homogenous residence time distributions. The particles’ residence time at temperatures above the polymer’s melting onset is determined from the simulations. This time accounts for the effective treatment (rounding) time of the particles. Clear correlations are observed between the numerically determined effective rounding time distributions and the progress of shape modification on the particles determined experimentally.

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Production of spherical powders on the basis of group IV metals for additive manufacturing

Cited by 13 publications

References 2 publications

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

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

Preparation of W-C-Co Composite Micropowder with Spherical Shaped Particles Using Plasma Technologies

Particle Lagrangian CFD Simulation and Experimental Characterization of the Rounding of Polymer Particles in a Downer Reactor with Direct Heating

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