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http://dx.doi.org/10.4191/kcers.2011.48.5.360

Flexural Strength of Macroporous Silicon Carbide Ceramics  

Lim, Kwang-Young (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)
Bae, Ji-Soo (YJC Co. Ltd.)
Publication Information
Journal of the Korean Ceramic Society / v.48, no.5, 2011 , pp. 360-367 More about this Journal
Abstract
Macroporous silicon carbide (SiC) ceramics were fabricated by powder processing and polymer processing using carbon-filled polysiloxane as a precursor. The effects of the starting SiC polytype, template type, and template content on porosity and flexural strength of macroporous SiC ceramics were investigated. The ${\beta}$-SiC powder as a starting material or a filler led to higher porosity than ${\alpha}$-SiC powder, owing to the impingement of growing ${\alpha}$-SiC grains, which were transformed from ${\beta}$-SiC during sintering. Typical flexural strength of powder-processed macroporous SiC ceramics fabricated from ${\alpha}$-SiC starting powder and polymer microbeads was 127 MPa at 29% porosity. In contrast, that of polymer-processed macroporous SiC ceramics fabricated from carbon-filled polysiloxane, ${\beta}$-SiC fillers, and hollow microspheres was 116MPa at 29% porosity. The combination of ${\alpha}$-SiC starting powder and a fairly large amount (10 wt%) of $Al_2O_3-Y_2O_3$ additives led to macroporous SiC ceramics with excellent flexural strength.
Keywords
Porous ceramics; Silicon carbide; Strength; Porosity; Polysiloxane;
Citations & Related Records
Times Cited By KSCI : 18  (Citation Analysis)
Times Cited By SCOPUS : 3
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