Shape Casting pp 239-252 | Cite as

The Contactless Electromagnetic Sonotrode

  • Koulis A. PericleousEmail author
  • Valdis Bojarevics
  • Georgi Djambazov
  • Agnieszka Dybalska
  • William Griffiths
  • Catherine Tonry
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Ultrasonic pressure waves generated using a tuned electromagnetic induction coil promote cavitation in alloy melts as an alternative to the immersed sonotrode technique. The method targets the same benefits offered by traditional UST (degassing, microstructure refinement, dispersion of particles), but without some of its drawbacks. The method is contactless, meaning it can be applied equally to high temperature/reactive melts, avoiding contamination due to probe erosion, and consequently, it is maintenance free. Due to induction stirring, larger volumes of melt can be treated (a major limitation of the traditional method), as the liquid is forced to pass repeatedly through zones of cavitation activity. The coil configuration used will depend on application. In the installation shown, a top conical coil immersed in aluminium melt (contactless due to EM repulsion) was used. Simulations of sound, flow and EM fields are given, compared with experiments and indicating strong stirring, evidence of cavitation through emitted sound signals and, most importantly, grain refinement.


Ultrasonic melt treatment Electromagnetic vibration Gas cavitation 



The authors acknowledge financial support from the ExoMet Project (co-funded by the European Commission (contract FP7-NMP3-LA-2012-280421), by the European Space Agency and by the individual partner organizations) and the UK Engineering and Physical Sciences Research Council (EPSRC) through grants EP/P034411/1, EP/R000239/1 and EP/R002037/1.


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Koulis A. Pericleous
    • 1
    Email author
  • Valdis Bojarevics
    • 1
  • Georgi Djambazov
    • 1
  • Agnieszka Dybalska
    • 2
  • William Griffiths
    • 3
  • Catherine Tonry
    • 1
  1. 1.Centre for Numerical Modelling and Process AnalysisUniversity of GreenwichLondonUK
  2. 2.School of Metallurgy and MaterialsUniversity of BirminghamBirminghamUK
  3. 3.University of BirminghamBirminghamUK

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