Processing of microcellular silicon carbide ceramics with a duplex pore structure |
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| Authors: | In-Hyuck Song Il-Min Kwon Hai-Doo Kim Young-Wook Kim |
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| Affiliation: | 1. Engineering Ceramics Group, Korea Institute of Materials Science, 531 Changwondaero, Changwon, Gyeongnam 641-831, Republic of Korea;2. Department of Materials Science and Engineering, The University of Seoul, Dongdaemoon-ku, Seoul 130-743, Republic of Korea;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK;1. Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Islamabad 45650, Pakistan;2. Engineering Ceramic Department, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-Gu, Changwon, Gyeongnam 642-831, Republic of Korea;1. Korea University of Science & Technology (UST), Daejeon 305-350, Republic of Korea;2. Powder and Ceramics Division, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 642-831, Republic of Korea |
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| Abstract: | A novel processing route for producing microcellular SiC ceramics with a duplex pore structure has been developed using a polysiloxane, carbon black, SiC, Al2O3, Y2O3, and two kinds of pore former (expandable microspheres and PMMA spheres). The duplex pore structure consists of large pores derived from the expandable microspheres and small windows in the strut area that were replicated from the PMMA spheres. The presence of these small windows in the strut area improved the permeability of the porous ceramics. The gas permeability coefficients of porous SiC ceramics were 0.13 × 1012 m2 for the porous SiC without PMMA spheres, 0.47 × 1012 m2 for the porous SiC with 10 wt% PMMA spheres, and 0.82 × 1012 m2 for the porous SiC with 20 wt% PMMA. |
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