Improved mechanical strength and thermal resistance of porous SiC ceramics with gradient pore sizes
Lucio M.D.S. Kultayeva S. Kim Y.-W.
December 2022Elsevier Ltd
Journal of the European Ceramic Society
2022#42Issue 156785 - 6794 pp.
Thermal insulation applications of porous SiC ceramics require low thermal conductivity and high mechanical strength. However, low thermal conductivity and high mechanical strength possess a trade-off relationship, because improving the mechanical strength requires decreasing the porosity, which increases the thermal conductivity. In this study, we established a new strategy for improving both the mechanical strengths and thermal resistances of porous SiC ceramics with micron-sized pores by applying a double-layer coating with successively decreasing pore sizes (submicron- and nano-sized pores). This resulted in a unique gradient pore structure. The double-layer coating increased the flexural strengths and decreased the thermal conductivities of the porous SiC ceramics by 24–70 % and 29–49 % depending on the porosity (48–62 %), improving both their mechanical strengths and thermal resistances. This strategy may be applicable to other porous ceramics for thermal insulation applications.
Flexural strength , Porous ceramics , Silicon carbide , Thermal conductivity
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Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul, 02504, South Korea
Center for Science and Postgraduate Education, International Educational Corporation, Almaty, 050043, Kazakhstan
Functional Ceramics Laboratory
Center for Science and Postgraduate Education
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