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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.118  No.1377 (May) (2010)  >  pp.380-383

Journal of the Ceramic Society of Japan
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Processing of porous silicon carbide with toughened strut microstructure

Jung-Hye EOM1), Young-Wook KIM1) and Masaki NARISAWA2)
1) Department of Materials Science and Engineering, The University of Seoul
2) Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University

  Porous SiC ceramics were fabricated by the carbothermal reduction of polysiloxane-derived SiOC containing hollow microspheres followed by sintering. The effect of the Al2O3–Y2O3–CaO (AYC) content on the microstructure and flexural strength of the porous SiC ceramics were investigated. The growth of large platelet α-SiC grains increased with increasing additive content due to enhanced grain growth and the β → α phase transformation of SiC. In situ toughened microstructures consisting of large platelet grains and fine equiaxed grains were obtained when 10 or 20 wt% AYC was added. The porosity generally decreased with increasing the additive content, whereas the flexural strength increased. The typical flexural strength of the porous SiC ceramics sintered with 10 wt% AYC was 61 MPa at a porosity of 44%.

Porous ceramics, SiC, Microstructure, Strength

Received: August 02, 2009
Accepted: November 19, 2009 , Published online: May 01, 2010
Copyright (c) 2010 The Ceramic Society of Japan



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