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Electrical conductivity of metal powder aggregates and sintered compacts

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Abstract

New equations for computing the electrical conductivity of powder aggregates and sintered compacts are proposed. In both cases, the effective or apparent conductivity is a function of the bulk material conductivity, the porosity of the sample and the tap porosity of the starting powder. Additional parameters are required for powder aggregates, such as the conductivity of the oxide covering the particles, the thickness of the oxide layers and the ease of descaling them. The new equations are valid from zero porosity to the tap porosity. Links between the equations and the percolation conduction theory are stated. Measurements of electrical resistance on sintered compacts and powder aggregates subjected to different pressures were performed. The proposed equations have been validated with these data. The electrical conductivity of both sintered compacts and powder aggregates of aluminium, bronze, iron and nickel was determined and compared to the equation predictions, resulting in notably good agreement.

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Acknowledgements

The authors are grateful to FEDER/MCyT, Madrid, for funding this research within the framework of Project DPI2012-37948-C02-01. The authors also wish to thank the technicians J. Pinto, M. Madrid and M. Sanchez for experimental assistance.

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Authors and Affiliations

  1. Group of Materials Science and Engineering, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092, Sevilla, Spain

    J. M. Montes, J. Cintas & J. M. Gallardo

  2. Department of Chemistry and Materials Science, Escuela Técnica Superior de Ingeniería, Universidad de Huelva, Campus La Rábida, Carretera Palos s/n, 21819, Palos de la Frontera, Huelva, Spain

    F. G. Cuevas

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  1. J. M. Montes
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  2. F. G. Cuevas
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Correspondence to J. M. Montes.

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Montes, J.M., Cuevas, F.G., Cintas, J. et al. Electrical conductivity of metal powder aggregates and sintered compacts. J Mater Sci 51, 822–835 (2016). https://doi.org/10.1007/s10853-015-9405-2

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  • DOI: https://doi.org/10.1007/s10853-015-9405-2

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