Effects of pore size on electrical and thermal properties of porous SiC ceramics
Das D. Lucio M.D.S. Kultayeva S. Kim Y.-W.
July/August 2024John Wiley and Sons Inc
International Journal of Applied Ceramic Technology
2024#21Issue 42651 - 2662 pp.
Porous SiC ceramics with three different pore sizes (∼7, ∼45, and ∼98 μm) and two different porosities (∼54% and ∼63%) were prepared to investigate the effects of pore size on electrical and thermal properties of the porous ceramics. With an increase in pore size from ∼7 to ∼98 μm at the same porosity (∼54%), the electrical and thermal conductivities of the porous ceramics increased from ∼1.01 to ∼2.30 Ω−1·cm−1 and ∼14.3 to ∼26.2 W·m−1K−1, respectively. Similar trends have been obtained in the ceramics with ∼63% porosity. The porous SiC ceramic with larger pore size has smaller pore/strut interface area at the same porosity, which leads to less carrier scattering and phonon-pore scattering at the pore/strut interfaces, resulting in higher electrical and thermal conductivities, respectively. These results suggest that the electrical and thermal properties of porous SiC ceramics can be successfully tuned by adjusting the pore size and porosity depending on the application.
electrical properties , porous ceramics , silicon carbide , thermal conductivity
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Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul, South Korea
Department of Science, International Educational Corporation, Almaty, Kazakhstan
Functional Ceramics Laboratory
Department of Science
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