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Effect of temperature on electrical and thermal conductivities of powder compacts: Ag-C and Ag-WC

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Abstract

The influence of temperature on electrical and thermal conductivities of two materials from powder metallurgy, Ag-C and Ag-WC, is studied. The increase in conductivities with heating temperature at constant density is showed. The need to consider temperature in addition to density in the conductivity models is highlighted. The coupled mechanisms, of densification and of bonding diffusion, which are at the beginning of the improvement of conductivities, are discussed. A new phenomenological model for electrical and thermal conductivities, taking into account these mechanisms and their interplay, is proposed. The model parameters are estimated. The model makes it possible to correctly predict the increases in conductivity of metal powders during manufacturing stages: cold compaction, annealing, free or load-assisted sintering.

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Acknowledgements

The authors are grateful to Schneider Electric Industries for their support and material supply and P. Pilvin for access and training to the Sidolo software.

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Author notes

  1. Philippe Rogeon, Vincent Keryvin, William Berckmans, Sophie Roure and Corinne Durand have equally contributed to this work.

Authors and Affiliations

  1. UMR CNRS 6027, IRDL, Univ. Bretagne Sud, 56100, Lorient, France

    Elodie Courtois, Philippe Rogeon, Vincent Keryvin & William Berckmans

  2. Schneider Electric, 31 rue Pierre Mendès France, 38320, Eybens, France

    Sophie Roure & Corinne Durand

Authors
  1. Elodie Courtois
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  2. Philippe Rogeon
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  3. Vincent Keryvin
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  4. William Berckmans
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  5. Sophie Roure
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  6. Corinne Durand
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Correspondence to Elodie Courtois.

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Courtois, E., Rogeon, P., Keryvin, V. et al. Effect of temperature on electrical and thermal conductivities of powder compacts: Ag-C and Ag-WC. J Mater Sci 57, 18839–18852 (2022). https://doi.org/10.1007/s10853-022-07811-7

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  • DOI: https://doi.org/10.1007/s10853-022-07811-7

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