Improved mechanical strength and thermal resistance of porous SiC ceramics with gradient pore sizes |
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| Affiliation: | 1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, the Republic of Korea;2. Center for Science and Postgraduate Education, International Educational Corporation, Almaty 050043, Kazakhstan;1. Shaanxi Province Key Laboratory of Fiber Reinforced Light Composites Materials, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;2. School of Mechanics, Civil Engineering & Architecture, Northwestern Polytechnical University, Xi’an, China;1. CEITEC BUT, Brno University of Technology, Purkynova 123, Brno 61200, Czech Republic;2. Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2, Brno 61669, Czech Republic;1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China;2. Key Laboratory of Materials Preparation and Protection for Harsh Environment (Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology, Nanjing 211106, China;3. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China;1. Departamento de Ingeniería Mecánica, Energética y de los Materiales,Universidad de Extremadura, 06006 Badajoz, Spain;2. Departamento de Física de la Materia Condensada,Universidad de Sevilla, 41080 Sevilla, Spain |
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| Abstract: | 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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| Keywords: | Silicon carbide Porous ceramics Thermal conductivity Flexural strength |
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