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Electromagnetically Modified Filtration of Aluminum Melts—Part I: Electromagnetic Theory and 30 PPI Ceramic Foam Filter Experimental Results

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An Erratum to this article was published on 12 October 2013

Abstract

In the present work, laboratory-scale continuous filtration tests of liquid A356 aluminum alloy have been performed. The tests were conducted using standard 30 PPI (pores per inch) ceramic foam filters combined with magnetic flux densities (~0.1 and 0.2 T), produced using two different induction coils operated at 50 Hz AC. A reference filtration test was also carried out under gravity conditions, i.e., without an applied magnetic field. The obtained results clearly prove that the magnetic field has a significant affect on the distribution of SiC particles. The influence of the electromagnetic Lorentz forces and induced bulk metal flow on the obtained filtration efficiencies and on the wetting behavior of the filter media by liquid aluminum is discussed. The magnitudes of the Lorentz forces produced by the induction coils are quantified based on analytical and COMSOL 4.2® finite element modeling.

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Acknowledgments

The present study was carried out as part of the RIRA (Remelting and Inclusion Refining of Aluminium) project funded by the Norwegian Research Council (NRC)—BIP Project No. 179947/I40. The industrial partners involved in the project are Hydro Aluminium AS, SAPA Heat Transfer AB, Alcoa Norway ANS, the Norwegian University of Science and Technology (NTNU), and SINTEF Materials and Chemistry. The funding granted by the industrial partners and the NRC is gratefully acknowledged. The authors wish to express their gratitude to Egil Torsetnes at the NTNU for helping with the design and construction of the experimental apparatus. Sincere gratitude is also due to Kurt Sandaunet at SINTEF for his support and help as well as for the use of the SINTEF laboratory. The high quality metallographic work of Robert Fritzsch and Behzad Mirzaei was also invaluable.

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Authors and Affiliations

  1. Department of Material Science and Engineering, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway

    Mark William Kennedy (PhD. Candidate, Chief Technology Officer), Jon Arne Bakken (Professor Emeritus) & Ragnhild E. Aune (Professor)

  2. Proval Partners S.A., 1004, Lausanne, Switzerland

    Mark William Kennedy (PhD. Candidate, Chief Technology Officer)

  3. Hydro Aluminium, Karmøy, 4265, Håvik, Norway

    Shahid Akhtar (Technical Manager)

  4. Department of Material Science and Engineering, Royal Institute of Technology (KTH), 100 44, Stockholm, Sweden

    Ragnhild E. Aune (Professor)

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  1. Mark William Kennedy
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  2. Shahid Akhtar
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  4. Ragnhild E. Aune
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Correspondence to Mark William Kennedy.

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Manuscript submitted December 2, 2011.

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Kennedy, M.W., Akhtar, S., Bakken, J.A. et al. Electromagnetically Modified Filtration of Aluminum Melts—Part I: Electromagnetic Theory and 30 PPI Ceramic Foam Filter Experimental Results. Metall Mater Trans B 44, 691–705 (2013). https://doi.org/10.1007/s11663-013-9798-8

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