期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 40, 期 3, 页码 594-602出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.10.056
关键词
Porous SiC-SiO2 composites; Compressive strength; Interfacial thermal resistance; Hierarchical porosity; Thermal Conductivity
资金
- National Research Foundation of Korea (NRF) - Ministry of Education [2018R1D1A1B07042558]
- Fundamental Research Program of the Korea Institute of Materials Science (KIMS) [PNK6200]
- National Research Council of Science & Technology (NST), Republic of Korea [PNK6780, PNK6200] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The incorporation of a thermally insulating secondary phase can significantly increase the interfacial thermal resistance attributed to its low intrinsic thermal conductivity and the creation of multiple phonon scattering interfaces between adjacent SiC particles. The newly developed porous SiC-33 wt% SiO2 composites with SiO2 as a thermally insulating secondary phase exhibited a very low thermal conductivity (0.047 Wm(-1) K-1, 72.4 % porous), which is an order of magnitude lower than the previously reported lowest thermal conductivity (0.14 Wm(-1) K-1, 76.3 % porous) for powder processed porous SiC ceramics and is even lower than the thermal conductivity (0.060 Wm(-1) K-1, 87.9% porous) of Si02 aerogel. The porous SiC-(16-73 wt%) SiO2 composites processed from nano beta-SiC and a 40 wt% carbon template exhibited a hierarchical (meso-/macro-porous) pore structure that transformed to a trimodal (micro-/meso-/macro-porous) porous structure when polysiloxane was added and sintering was performed at 600-1000 degrees C in air.
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