Mates, S.
, Biancaniello, F.
and Ridder, S.
(2002),
An Alternate View of Close-Coupled Gas Atomization of Liquid Metals, Powder Metallurgy
(Accessed December 14, 2024)
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An Alternate View of Close-Coupled Gas Atomization of Liquid Metals
Published
Author(s)
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Abstract
The production of metal powders by close-coupled inert gas atomization is a complex process that has yet to be understood to the degree necessary that nozzle geometry and processing conditions can be chosen easily to adequately control particle size distributions in an efficient manner. This paper reviews attempts to characterize this unique atomization process in order to better understand the key atomizing mechanisms responsible for creating particles tens of micrometers in diameter. Flow visualization studies suggest that typical industrial atomization processes may be more complex than the traditionally held view involving the rapid primary breakup of a thin melt film at the nozzle tip. Instead, secondary breakup processes, taking place well downstream of the nozzle tip region, may have a greater impact on particle size. Implications of this alternative view on approaches for particle size control and for improving atomization efficiency are discussed, and preliminary results are presented on the influence of atomizer chamber pressure on particle size and atomization efficiency for a nitrogen-atomized stainless steel.Citation
Powder Metallurgy
Pub Type
Journals
Keywords
close-coupled nozzles, fine powder, gas atomization, nozzle design, supersonic jets
Citation
Issues
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Created January 1, 2002, Updated February 17, 2017