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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.118  No.1381 (September) (2010)  >  pp.810-813

Journal of the Ceramic Society of Japan
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Effect of additive composition on porosity and flexural strength of porous self-bonded SiC ceramics

Gary P. KENNEDY1), Kwang-Young LIM2) and Young-Wook KIM2)
1) Department of Information Display, Kyung Hee University
2) Department of Materials Science and Engineering, University of Seoul

  The effect of additive incorporation in porous self-bonded SiC (SBSC) ceramics fabricated from a mixture of coarse SiC powder (∼65 µm), Si and C is investigated here. Generally, it was found that the additive reduced the porosity and increased the flexural strength of the SBSC ceramic material. This was consistent with the presence of necking in the ceramic microstructure. The flexural strength of the material without additive (control sample) was ∼16–17 MPa and this was found to be enhanced up to ∼33 MPa using 2 wt % B and ∼38 MPa, using a mixture of 1 wt % Al + 1 wt % B. Thus, the porous SiC ceramic with Al–B additive (typical flexural strength ∼38 MPa at 42% porosity) is very promising, contrasting its mechanical properties with the cost-effectiveness of the raw materials.

Porous ceramics, SiC, Additive, Porosity, Strength

Received: May 11, 2010
Accepted: June 17, 2010 , Published online: September 01, 2010
Copyright (c) 2010 The Ceramic Society of Japan



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