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Thermal conductivity of porous materials

Published online by Cambridge University Press:  03 July 2013

David S. Smith ,
Arnaud Alzina ,
Julie Bourret ,
Benoît Nait-Ali ,
Fabienne Pennec ,
Nicolas Tessier-Doyen ,
Kodai Otsu ,
Hideaki Matsubara ,
Pierre Elser  and
Urs T. Gonzenbach
David S. Smith*
Affiliation:
Groupe d’Etude des Matériaux Hétérogènes (GEMH), ENSCI, Centre Européen de la Céramique, 87068 LIMOGES Cedex, France
Arnaud Alzina
Affiliation:
Groupe d’Etude des Matériaux Hétérogènes (GEMH), ENSCI, Centre Européen de la Céramique, 87068 LIMOGES Cedex, France
Julie Bourret
Affiliation:
Groupe d’Etude des Matériaux Hétérogènes (GEMH), ENSCI, Centre Européen de la Céramique, 87068 LIMOGES Cedex, France
Benoît Nait-Ali
Affiliation:
Groupe d’Etude des Matériaux Hétérogènes (GEMH), ENSCI, Centre Européen de la Céramique, 87068 LIMOGES Cedex, France
Fabienne Pennec
Affiliation:
Groupe d’Etude des Matériaux Hétérogènes (GEMH), ENSCI, Centre Européen de la Céramique, 87068 LIMOGES Cedex, France
Nicolas Tessier-Doyen
Affiliation:
Groupe d’Etude des Matériaux Hétérogènes (GEMH), ENSCI, Centre Européen de la Céramique, 87068 LIMOGES Cedex, France
Kodai Otsu
Affiliation:
Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555 Japan
Hideaki Matsubara
Affiliation:
Japan Fine Ceramics Center, Atsuta, Nagoya, 456-8587 Japan
Pierre Elser
Affiliation:
De Cavis Ltd., 8093 Zürich, Switzerland
Urs T. Gonzenbach
Affiliation:
De Cavis Ltd., 8093 Zürich, Switzerland
*
a)Address all correspondence to this author. e-mail: david.smith@unilm.fr
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Abstract

Incorporation of porosity into a monolithic material decreases the effective thermal conductivity. Porous ceramics were prepared by different methods to achieve pore volume fractions from 4 to 95%. A toolbox of analytical relations is proposed to describe the effective thermal conductivity as a function of solid phase thermal conductivity, pore thermal conductivity, and pore volume fraction (νp). For νp < 0.65, the Maxwell–Eucken relation for closed porosity and Landauer relation for open porosity give good agreement to experimental data on tin oxide, alumina, and zirconia ceramics. For νp > 0.65, the thermal conductivity of kaolin-based foams and calcium aluminate foams was well described by the Hashin Shtrikman upper bound and Russell’s relation. Finally, numerical simulation on artificially generated microstructures yields accurate predictions of thermal conductivity when fine detail of the spatial distribution of the phases needs to be accounted for, as demonstrated with a bio-aggregate material.

Type
Invited Papers
Information
Journal of Materials Research , Volume 28 , Issue 17: Focus Issue: Advances in the Synthesis, Characterization, and Properties of Bulk Porous Materials , 14 September 2013 , pp. 2260 - 2272
Copyright
Copyright © Materials Research Society 2013 

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References

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