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Pressure-Induced Foaming of Metals

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Abstract

Pressure-induced foaming (PIF) of metals is a foaming technique in which blowing agent free compacted metal powders are foamed. The method consists of heating hot-compacted metallic precursors to above their melting temperature under gas overpressure and foaming them by pressure release. This study focuses on PIF of Al99.7 and AlSi7 alloys under both air or Ar and overpressures up to 9 bar. In situ x-ray radioscopy allows us to follow the foaming process and to perform quantitative analyses of expansion, foam morphology, and coalescence rate. Mass spectrometry helps to identify hydrogen as the foaming gas. Adsorbates on the former powder particles are found to be the primary gas source. Various advantages of this new method are identified and discussed.

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Acknowledgements

Funding by the European Space Agency ESA (Project μG-Foam, AO–99–075) is gratefully acknowledged.

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Authors and Affiliations

  1. Helmholtz-Centre Berlin for Materials and Energy, 14109, Berlin, Germany

    Francisco García-Moreno, Catalina Jiménez & John Banhart

  2. Technical University Berlin, 10623, Berlin, Germany

    Francisco García-Moreno & John Banhart

  3. Indian Institute of Technology, Madras, Chennai, 600 036, India

    Manas Mukherjee

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  1. Francisco García-Moreno
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Correspondence to Francisco García-Moreno.

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García-Moreno, F., Mukherjee, M., Jiménez, C. et al. Pressure-Induced Foaming of Metals. JOM 67, 955–965 (2015). https://doi.org/10.1007/s11837-015-1331-x

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