期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 42, 期 15, 页码 6785-6794出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2022.09.001
关键词
Silicon carbide; Porous ceramics; Thermal conductivity; Flexural strength
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education
- [2018R1D1A1B07042558]
In this study, a new strategy of applying a double-layer coating was established to improve both the mechanical strengths and thermal resistances of porous SiC ceramics. The double-layer coating led to a unique gradient pore structure, resulting in increased flexural strengths and decreased thermal conductivities of the ceramics.
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.
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