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The Application of Centrifugal Atomization Method for Preparation of Rapidly Solidified Nd-Fe-B Flakes Used for Production of Permanent Magnets

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Abstract

Nd-Fe-B-type permanent magnets are used in applications that require a high-energy product/volume ratio in order to reduce weight. Automotive industry, hard drives, or wind turbines are just examples of an application where their use can be found. Conventional casting techniques reveal the formation of a high quantity of α-Fe and large Nd-rich regions. On the other hand, new techniques, like strip casting, melt-spinning and centrifugal atomization, produce homogeneous and fine-scaled microstructures. This paper discusses the application of rapid solidification by means of the centrifugal atomization method for preparation of Nd-Fe-B flakes. The effect of alloy composition and various process parameters of centrifugal atomization on the microstructure of rapidly solidified Nd-Fe-B alloy were investigated. The microstructures and the phase composition were examined by metallographic techniques, namely optical and scanning electron microscopy. Additionally, the influence of the processing parameters on the microstructures of as-cast flakes and subsequent magnetic properties of the prepared magnets will be discussed.

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Authors and Affiliations

  1. Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia

    Mihael Brunčko, Peter Kirbiš & Ivan Anžel

  2. Magneti Ljubljana d.d., Ljubljana, Slovenia

    Žiga Erman

  3. SIJ Metal Ravne doo, Ravne na Koroškem, Slovenia

    Peter Kirbiš

Authors
  1. Mihael Brunčko
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  2. Žiga Erman
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  3. Peter Kirbiš
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  4. Ivan Anžel
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Corresponding author

Correspondence to Mihael Brunčko.

Additional information

This article is an invited submission to JMEP selected from presentations at the Symposium “Solidification, Casting, Foundry and Liquid Metal Processing,” belonging to the Topic “Joining” at the European Congress and Exhibition on Advanced Materials and Processes (EUROMAT 2017), held September 17-22, 2017, in Thessaloniki, Greece, and has been expanded from the original presentation.

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Brunčko, M., Erman, Ž., Kirbiš, P. et al. The Application of Centrifugal Atomization Method for Preparation of Rapidly Solidified Nd-Fe-B Flakes Used for Production of Permanent Magnets. J. of Materi Eng and Perform 27, 5136–5140 (2018). https://doi.org/10.1007/s11665-018-3564-7

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  • DOI: https://doi.org/10.1007/s11665-018-3564-7

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