Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Flexural Strength of Macroporous Silicon Carbide Ceramics

거대기공 다공질 탄화규소 세라믹스의 꺾임강도

  • 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.)
  • 임광영 (서울시립대학교 신소재공학과 기능성세라믹스연구실) ;
  • 김영욱 (서울시립대학교 신소재공학과 기능성세라믹스연구실) ;
  • 송인혁 (재료연구소(KIMS) 엔지니어링세라믹연구그룹) ;
  • 배지수 ((주) 와이제이씨)
  • Received : 2011.08.04
  • Accepted : 2011.08.22
  • Published : 2011.09.30
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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

References

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