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Cold Spraying of Amorphous Cu50Zr50 Alloys

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Abstract

A new range of applications in cold spraying is expected for bulk metallic glass (BMG) coatings. For retaining amorphous structures in cast multi-component BMG parts, typically high purity raw material must be used. The present investigation explores an alternative approach, where cold spraying is used to deposit a technical-grade binary amorphous alloy. This approach is shown to be potentially cost-effective and suitable for rapid manufacturing. For this purpose, amorphous Cu50Zr50 was chosen as a model alloy system, and cold spraying was performed using nitrogen as process gas. By a systematic variation of the spray parameter sets, the critical velocities for coating formation were determined experimentally. Based on the current models of bonding of amorphous Cu50Zr50 powder in cold spraying, a new, more comprehensive concept of bonding and rebound is presented, which also considers the presence of liquefied interfaces and quenching rates for resolidification. Results concerning impact morphologies and coating formation demonstrate that under suitable choice of spray conditions, well-adhering coatings with amorphous structure of the Cu50Zr50 powders can be obtained by cold spraying.

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Acknowledgments

The authors like to thank in alphabetical order Thomas Breckwoldt, Norbert Németh, Camilla Schulze, and Uwe Wagener from the HSU-team and Dr. Michael Oehring from Helmholtz Zentrum Geesthacht, Center for Materials And Coastal Research GmbH, Germany, for technical support.

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Authors and Affiliations

  1. Helmut Schmidt University, University of the Federal Armed Forces, Hamburg, Germany

    A. List, F. Gärtner, M. Schulze, H. Assadi & T. Klassen

  2. National Institute for Materials Science, Tsukuba (Ibaraki), Japan

    T. Mori & S. Kuroda

Authors
  1. A. List
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  2. F. Gärtner
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  3. T. Mori
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  4. M. Schulze
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  5. H. Assadi
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  6. S. Kuroda
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  7. T. Klassen
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Corresponding author

Correspondence to A. List.

Additional information

This article is an invited paper selected from presentations at the 2014 International Thermal Spray Conference, held May 21-23, 2014, in Barcelona, Spain, and has been expanded from the original presentation.

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List, A., Gärtner, F., Mori, T. et al. Cold Spraying of Amorphous Cu50Zr50 Alloys. J Therm Spray Tech 24, 108–118 (2015). https://doi.org/10.1007/s11666-014-0187-x

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  • DOI: https://doi.org/10.1007/s11666-014-0187-x

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