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High-temperature resistivity of aluminum–carbon nanotube composites

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Abstract

The resistivity and thermal coefficient of resistivity (TCR), of metallic matrix composites, MMCs, aluminum–carbon nanotube, Al-CNT, were studied under high vacuum in the temperature interval from RT to 800 K. The samples shaped as small cylinders and containing single-walled CNTs or multi-walled CNTs were sintered at 625 °C. The resistivity of sintered samples of pure Al was found three orders of magnitude higher with respect to bulk, having the former a density value equal to 98.8 % of bulk Al. The explored range of the CNT concentration was within 5 wt%. At the highest CNT concentrations, the trend of resistivity against temperature was found negative being more pronounced for composites with MWCNTs. For Al-SWCNT composites, at around 3.3 wt% (4.2 vol%), TCR is practically independent from temperature; for Al-MWCNT, the TCR zero-crossing occurs at different compositions depending on temperature. Higher is the temperature, lower is the TCR zero-crossing composition. Resistivity data were discussed in the framework of the Matthiessen’s rule and sound evidences were shown that no Al4C3 formation was detected at working temperatures.

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Acknowledgements

The authors acknowledge the technical contribution in the experiments of Dr. Francesco Di Pascasio of the Department of Chemistry, University of Rome La Sapienza. This work was supported by Università di Roma “La Sapienza.”

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Author notes

  1. V. Genova

    Present address: Dipartimento di Ingegneria Chimica Materiali Ambiente, Università di Roma “La Sapienza”, Rome, Italy

Authors and Affiliations

  1. Dipartimento di Chimica, Università di Roma “La Sapienza”, Piazzale Aldo Moro 5, 00185, Rome, Italy

    V. Genova, D. Gozzi & A. Latini

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  1. V. Genova
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  2. D. Gozzi
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  3. A. Latini
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Correspondence to D. Gozzi.

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Genova, V., Gozzi, D. & Latini, A. High-temperature resistivity of aluminum–carbon nanotube composites. J Mater Sci 50, 7087–7096 (2015). https://doi.org/10.1007/s10853-015-9263-y

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  • DOI: https://doi.org/10.1007/s10853-015-9263-y

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