Title: New insights into the mechanism of ultrasonic atomization for the production of metal powders in additive manufacturing

Journal Article · · Additive Manufacturing
ORCiD logo [1];  [1];  [2]; ORCiD logo [2]; ORCiD logo [3];  [4];  [5];  [5];  [6];  [4]; ORCiD logo [7]; ORCiD logo [8]
  1. Oxford Brookes University (United Kingdom)
  2. Warsaw University of Technology (Poland); Amazemet Sp. z o.o., Ltd., Warsaw (Poland)
  3. University of Wyoming, Laramie, WY (United States)
  4. University College London (United Kingdom); Harwell Science and Innovation Campus, Didcot (United Kingdom)
  5. Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  6. University of Hull (Untied Kingdom)
  7. Brunel University London (United Kingdom)
  8. Oxford Brookes University (United Kingdom); University of Oxford (United Kingdom)

Ultrasonic atomization is one of the promising technologies for producing metal powders for additive manufacturing, where precise control of particle size and morphology is essential. In this study, we coupled an ultrasonic transducer with a carbon fiber plate and atomized liquid droplets and films under different vibration amplitudes. Water, glycerol, and pure aluminum melt were used to study the atomization mechanism and the resulting droplet/powder characteristics, respectively. High-speed optical and ultrafast synchrotron X-ray imaging were used to study in situ the ultrasonic atomization dynamics, including pulsation and clustering of cavities inside the liquid layer/films, development of capillary waves, and formation of liquid droplets. For the first time, we observed and captured the occurrence of cavitation during the atomization of resting drops, films and impact droplets. The inertial cavitation events interfered with the capillary waves across the interphase boundary, puncturing and breaking the boundary to produce atomized mist. The in situ observation revealed the intricate dynamics of ultrasonic atomization and underscored the pivotal role of cavitation events throughout the entire atomization process. We also conducted experiments on ultrasonic atomization of liquid aluminum, producing particles of perfectly spherical shape. The particle size tended to decrease with reduced vibration amplitude Our work has demonstrated the important processing strategies on how to tailor the particle size while ensuring consistent particle shape and morphology, which is the key processing capability for producing high quality powders for additive manufacturing applications.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Engineering and Physical Sciences Research Council (EPSRC); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2305770
Journal Information:
Additive Manufacturing, Journal Name: Additive Manufacturing Vol. 83; ISSN 2214-8604
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (62)

Application of the Maximum Entropy Formalism on Sprays Produced by Ultrasonic Atomizers journal May 2003
Atomization of Specialty Alloy Powders journal January 1981
Transient high-frequency ultrasonic water atomization journal September 2002
Metal Additive Manufacturing: A Review journal April 2014
Ultrasonic atomization-a photographic study of the mechanism of disintegration journal January 1973
Powdering aluminium and aluminium alloys by ultrasound journal January 1974
Correlations to predict droplet size in ultrasonic atomisation journal June 2001
Enhancement of ultrasonic cavitation yield by multi-frequency sonication journal October 2002
Acoustic cavitation detection during ultrasonic atomization process journal April 2022
Dynamics of ultrasonic atomization of droplets journal April 2018
Dynamic behaviors of droplets impacting on ultrasonically vibrating surfaces journal April 2020
Investigation of capillary wave, cavitation and droplet diameter distribution during ultrasonic atomization journal January 2021
Faraday wave instability characteristics of a single droplet in ultrasonic atomization and the sub-droplet generation mechanism journal June 2022
Spatial distribution and transient evolution of sub-droplet velocity and size in ultrasonic atomization journal January 2023
An experimental study on turbulent swirling water flow with immiscible droplets journal August 2006
Two-dimensional numerical investigation on the dynamics of ligament formation by Faraday instability journal April 2014
Phase, pressure and velocity evolution and atomization characteristics of multiple Faraday waves in ultrasonic atomization: experiments and simulations journal November 2022
Application of a plate sonotrode to ultrasonic degassing of aluminum melt: Acoustic measurements and feasibility study journal August 2015
A review of selective laser melting of aluminum alloys: Processing, microstructure, property and developing trends journal February 2019
New insights into sono-exfoliation mechanisms of graphite: In situ high-speed imaging studies and acoustic measurements journal October 2021
Ultrasonic vibration-assisted laser atomization of stainless steel journal November 2017
Jamming during particle spreading in additive manufacturing journal October 2018
A simple method for assessing powder spreadability for additive manufacturing journal May 2020
Ultrasonic atomization: Effect of liquid phase properties journal February 2006
Frequency and wavelength prediction of ultrasonic induced liquid surface waves journal December 2016
Analysis of concentration characteristics in ultrasonic atomization by droplet diameter distribution journal January 2005
Intensification of hydroxyl radical production in sonochemical reactors journal July 2007
Investigations into ultrasound induced atomization journal January 2013
Incubation pit analysis and calculation of the hydrodynamic impact pressure from the implosion of an acoustic cavitation bubble journal March 2014
Characterizing the cavitation development and acoustic spectrum in various liquids journal January 2017
Fabrication of Al and Al-Si alloy microspheres by ultrasonic irradiating the molten salt-aluminum immiscible system journal January 2019
On the governing fragmentation mechanism of primary intermetallics by induced cavitation journal January 2021
Characterising the cavitation activity generated by an ultrasonic horn at varying tip-vibration amplitudes journal January 2021
Acoustic resonance and atomization for gas-liquid systems in microreactors journal July 2021
Cavitation-induced shock wave behaviour in different liquids journal March 2023
Vibration-induced drop atomization and bursting journal February 2003
Vibration-induced drop atomization and the numerical simulation of low-frequency single-droplet ejection journal February 2003
Pyramidal and toroidal water drops after impact on a solid surface journal June 2003
Secondary Bjerknes forces between two bubbles and the phenomenon of acoustic streamers journal January 2004
Experimental study of the Faraday instability journal December 1990
Threshold condition for spray formation by Faraday instability journal October 2014
Characterization of shock waves in power ultrasound journal March 2021
The Theory of Sound journal June 1898
Size distributions of droplets produced by ultrasonic nebulizers journal April 2019
The mechanism of the formation of fogs by ultrasonic waves journal January 1936
Spray characterization during vibration-induced drop atomization journal February 2004
Interfacial destabilization and atomization driven by surface acoustic waves journal July 2008
Attached cavitation at a small diameter ultrasonic horn tip journal February 2014
Confinement of surface waves at the air-water interface to control aerosol size and dispersity journal November 2017
Cavitation Produced by Ultrasonics: Theoretical Conditions for the Onset of Cavitation journal December 1951
Jet formation at interaction of a vibrating plate with liquid journal June 2017
The stability of the plane free surface of a liquid in vertical periodic motion
  • Benjamin, Thomas Brooke; Ursell, Fritz Joseph
  • Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, Vol. 225, Issue 1163, p. 505-515 https://doi.org/10.1098/rspa.1954.0218
journal September 1954
Bjerknes forces between small cavitation bubbles in a strong acoustic field journal September 1997
Faraday instability of a liquid layer in ultrasonic atomization journal March 2022
Breaking Faraday Waves: Critical Slowing of Droplet Ejection Rates journal April 1999
Ultrasonic Atomization of Liquids journal January 1962
Cavitation-induced capillary waves in ultrasonic atomization journal January 1980
Vibrational spraying of liquid by a thin rod journal February 2008
On The Statistics Of Ultrasonically Produced Water Droplets journal July 2005
Metallic Powder Production from a Plate Arc Electrode Vibrated in an Ultrasonic Frequency journal January 1992
Development of High-Power Ultrasonic System Dedicated to Metal Powder Atomization journal August 2023
Novel Cold Crucible Ultrasonic Atomization Powder Production Method for 3D Printing journal May 2021