Thermal conductivity of porous materials

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 func...

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Bibliographic Details
Published in:Journal of materials research 2013-09, Vol.28 (17), p.2260-2272
Main Authors: Smith, David S., Alzina, Arnaud, Bourret, Julie, Nait-Ali, Benoît, Pennec, Fabienne, Tessier-Doyen, Nicolas, Otsu, Kodai, Matsubara, Hideaki, Elser, Pierre, Gonzenbach, Urs T.
Format: Article
Language:English
Subjects:
Analysis
Applied and Technical Physics
Biomaterials
Ceramics
Foams
Grain boundaries
Heat conductivity
Heat transfer
High temperature
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Mathematical analysis
Mathematical models
Measurement techniques
Microstructure
Morphology
Nanotechnology
Pore size
Porosity
Porous materials
Radiation
Sintering
Studies
Thermal conductivity
Volume fraction
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Summary: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 (ν p ). For ν p < 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 ν p > 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.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2013.179