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Pressure-less spark plasma sintering effect on non-conventional necking process during the initial stage of sintering of copper and alumina

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Abstract

In the present study, we focus on the characterization of the necking mechanisms during the early stages of pressure-less spark plasma sintering (PL-SPS) compared to conventional sintering (CS) of two different types of powdered materials (Cu and α-Al2O3). SEM observations of the evolution of particle morphology and necks from the as-received powders to sintered ones show the nature of the neck between particles which were either in contact or not. For alumina, no particular necking process (melt or viscous bridge) was observed regardless of the sintering conditions (PL-SPS and CS), even for a very high heating rate 455 °C/min. For copper, this neck morphology is unequivocally not typical of conventional ones, thus, suggesting mass transport by an ejection mechanism. This particular morphology was seen occasionally. In comparison, the conventionally sintered Cu particles presented a smoother surface, with conventional curved necks suggesting the contribution of surface diffusion mechanisms. Based on partial pressure calculations, a direct thermal effect might not explain the observed non-conventional neck for copper. On the other hand, local field enhancement effect and local favourable thermal breakdown voltage conditions are described and discussed in order to support the experimental results.

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Acknowledgements

The authors gratefully acknowledge the support received from ‘Région Rhône Alpes—MACODEV’ for this study (M. Yann Aman thesis), Pr. G. Fantozzi and G. Bonnefont from the SPS consortium at INSA Lyon.

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Authors and Affiliations

  1. Laboratoire MATEIS UMR CNRS 5510, INSA Lyon, Université de Lyon, 7 avenue Jean Capelle, 69621, Villeurbanne, France

    Yann Aman & Vincent Garnier

  2. Laboratoire LEPMI UMR CNRS 5631, Grenoble INP, Université Joseph Fourier, Domaine Universitaire 1130 rue de la piscine, 38402, Saint Martin d’Hères, France

    Yann Aman & Elisabeth Djurado

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  1. Yann Aman
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  2. Vincent Garnier
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  3. Elisabeth Djurado
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Correspondence to Vincent Garnier.

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Aman, Y., Garnier, V. & Djurado, E. Pressure-less spark plasma sintering effect on non-conventional necking process during the initial stage of sintering of copper and alumina. J Mater Sci 47, 5766–5773 (2012). https://doi.org/10.1007/s10853-012-6469-0

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  • DOI: https://doi.org/10.1007/s10853-012-6469-0

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