Publication de 12 numéros par an
ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684
Indexed in
ATOMIZATION OF VISCOUS MELTS
RÉSUMÉ
Specific melt types have high viscosity and comparably low surface tension. Therefore, conventional twin-fluid atomization of these viscous melts for powder production often results not in spherical particles but in a great amount of fiber material. In this investigation, viscous mineral melts are atomized in a pilot plant by means of hot gases for spherical particle granulation. Experimental results show that an almost fiber-free product (97% spherical powder) can be obtained. Usually, the atomization process is controlled by the gas pressure only (here before the expansion in the atomizer nozzle). For constant atomization pressure the mass median diameter of the powder yield decreases with increasing atomization gas temperature.
Numerical simulations of the gas flow field in the atomizer vicinity support the analysis of the melt fragmentation process by obtaining the gas temperature distribution and the gas flow conditions within the atomization process. Simulations for different atomizer nozzle designs and several operating conditions have been realized. From the discussion of the experimental results together with the results of the simulations, the relevant shear process between the melt jet and the atomization gas, characterized by the Reynolds number, can be determined as the main driving mechanism of the atomization and spheroidization process.
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Walzel Peter, Furuta Takeshi, Morphology and Properties of Spray-Dried Particles, in Modern Drying Technology, 2014. Crossref
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Pogozhev Yu. S., Sanin V. N., Ikornikov D. M., Andreev D. E., Yukhvid V. I., Levashov E. A., Sentyurina Zh. A., Logacheva A. I., Timofeev A. N., NiAl-based electrodes by combined use of centrifugal SHS and induction remelting, International Journal of Self-Propagating High-Temperature Synthesis, 25, 3, 2016. Crossref
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Anderson Iver E., Achelis Lydia, Two Fluid Atomization Fundamentals, in Metal Sprays and Spray Deposition, 2017. Crossref
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Walzel Peter, Furuta Takeshi, Morphology and Properties of Spray‐Dried Particles, in Modern Drying Technology, 2011. Crossref
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Soares Barreto Erika, Frey Maximilian, Wegner Jan, Jose Allen, Neuber Nico, Busch Ralf, Kleszczynski Stefan, Mädler Lutz, Uhlenwinkel Volker, Properties of gas-atomized Cu-Ti-based metallic glass powders for additive manufacturing, Materials & Design, 215, 2022. Crossref