Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of SiC Filler Content on Microstructure and Flexural Strength of Highly Porous SiC Ceramics Fabricated from Carbon-Filled Polysiloxane

SiC 필러 함량이 탄소 함유 Polysiloxane으로부터 제조된 고기공률 탄화규소 세라믹스의 미세조직과 꺾임강도에 미치는 영향

  • 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)
  • 엄정혜 (서울시립대학교 신소재공학과) ;
  • 김영욱 (서울시립대학교 신소재공학과) ;
  • 송인혁 (재료연구소 엔지니어링세라믹연구그룹)
  • Received : 2012.10.12
  • Accepted : 2012.11.05
  • Published : 2012.11.30
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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

References

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