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J. Korean Ceram. Soc. > Volume 48(5); 2011 > Article
Journal of the Korean Ceramic Society 2011;48(5): 360.
doi: https://doi.org/10.4191/kcers.2011.48.5.360
거대기공 다공질 탄화규소 세라믹스의 꺾임강도
임광영, 김영욱, 송인혁1, 배지수2
서울시립대학교 신소재공학과 기능성세라믹스연구실
1재료연구소(KIMS) 엔지니어링세라믹연구그룹
2(주) 와이제이씨
Flexural Strength of Macroporous Silicon Carbide Ceramics
Kwang-Young Lim, Young-Wook Kim, In-Hyuck Song1, Ji-Soo Bae2
Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul
1Engineering Ceramics Group, Korea Institute of Materials Science
2YJC Co. Ltd.
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.
Key words: Porous ceramics, Silicon carbide, Strength, Porosity, Polysiloxane
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