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http://dx.doi.org/10.4191/kcers.2012.49.6.625

Effect of SiC Filler Content on Microstructure and Flexural Strength of Highly Porous SiC Ceramics Fabricated from Carbon-Filled Polysiloxane  

Eom, Jung-Hye (Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul)
Kim, Young-Wook (Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul)
Song, In-Hyuck (Engineering Ceramics Group, Korea Institute of Materials Science)
Publication Information
Journal of the Korean Ceramic Society / v.49, no.6, 2012 , pp. 625-630 More about this Journal
Abstract
Highly porous silicon carbide (SiC) ceramics were fabricated from polysiloxane, SiC and carbon black fillers, AlN-$Y_2O_3$ additives, and poly (ether-co-octene) (PEOc) and expandable microsphere templates. Powder mixtures with a fixed PEOc content (30 wt%) and varying SiC filler contents from 0-21 wt% were compression-molded. During the pyrolysis process, the polysiloxane was converted to SiOC, the PEOc generated a considerable degree of interconnected porosity, and the expandable microspheres generated fine cells. The polysiloxane-derived SiOC and carbon black reacted and synthesized nano-sized SiC with a carbothermal reduction during a heat-treatment. Subsequent sintering of the compacts in a nitrogen atmosphere produced highly porous SiC ceramics with porosities ranging from 78 % to 82 % and a flexura lstrength of up to ~7 MPa.
Keywords
Porous ceramics; Silicon carbide; Porosity; Strength; Compression molding;
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Times Cited By KSCI : 12  (Citation Analysis)
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