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J. Korean Ceram. Soc. > Volume 46(5); 2009 > Article
Journal of the Korean Ceramic Society 2009;46(5): 520.
doi: https://doi.org/10.4191/kcers.2009.46.5.520
알루미늄 첨가가 다공질 Self-Bonded SiC 세라믹스의 기공률과 꺾임강도에 미치는 영향
임광영, 김영욱, 우상국1, 한인섭1
서울시립대학교 신소재공학과
1한국에너지기술연구원 에너지재료연구센터
Effect of Aluminum Addition on Porosity and Flexural Strength of Porous Self-Bonded Silicon Carbide Ceramics
Kwang-Young Lim, Young-Wook Kim, Sang-Kuk Woo1, In-Sub Han1
Department of Materials Science and Engineering, the University of Seoul
1Energy Materials Research Center, Korea Institute of Energy Research
ABSTRACT
Porous self-bonded silicon carbide (SBSC) ceramics were fabricated at temperatures ranging from 1750 to $1850^{circ}C$ using SiC, Si, C as starting materials and Al as an optional sintering additive. The effect of Al addition on the porosity and strength of the porous SBSC ceramics were investigated as functions of sintering temperature and Si:C ratio. The porosity increased with decreasing the Si:C ratio and increasing the sintering temperature. It was possible to fabricate SBSC ceramics with porosities ranging from 37% to 44% by adjusting the Si:C ratio and the sintering temperature. Addition of Al additive promoted densification and necking between SiC grains, resulting in improved strength. Typical flexural strengths of SBSC ceramics with and without Al addition were 44 MPa and 34MPa, respectively.
Key words: Porous ceramics, Silicon carbide, Aluminum, Porosity, Strength
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