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Density gradients in aluminium foams: characterisation by computed tomography and measurements of the effective thermal conductivity

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Abstract

The density gradients present in several aluminium foams, produced by the powder metallurgical route, have been analysed by using computed tomography and by measuring the effective thermal conductivity (λ). The method used to measure λ, Transient Plane Source (TPS) technique, allows obtaining values of the local thermal conductivity, i.e. conductivity of a localised zone within the sample. These values have been related to the density of the measured zone, which was obtained from the computed tomography experiments. A power law relationship between local effective thermal conductivity and local density has been obtained.

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Acknowledgments

The authors are grateful to the IFAM in Bremen (D. Lehmhus) which supplied the materials of this work and to the Hospitals “Clínico Universitario” (Mr. César P. Zapata) and “Pío Río Hortega” (Mr. Ignacio Hernando), placed in Valladolid, which allowed us working with their helical scanners.

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Authors and Affiliations

  1. Dpto Física de la Materia Condensada, Facultad de Ciencias, Universidad de Valladolid, 47011, Valladolid, Spain

    E. Solórzano, M. A. Rodríguez-Pérez & J. A. de Saja

  2. Index. Servicios de Ingeniería, Miranda de Ebro, Spain

    J. A. Reglero

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  1. E. Solórzano
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  2. M. A. Rodríguez-Pérez
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  3. J. A. Reglero
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  4. J. A. de Saja
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Correspondence to M. A. Rodríguez-Pérez.

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Solórzano, E., Rodríguez-Pérez, M.A., Reglero, J.A. et al. Density gradients in aluminium foams: characterisation by computed tomography and measurements of the effective thermal conductivity. J Mater Sci 42, 2557–2564 (2007). https://doi.org/10.1007/s10853-006-1233-y

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  • DOI: https://doi.org/10.1007/s10853-006-1233-y

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