| 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. |
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| ABSTRACT |
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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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