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J. Korean Ceram. Soc. > Volume 43(9); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(9): 552.
doi: https://doi.org/10.4191/kcers.2006.43.9.552
탄소열환원 공정을 사용한 다공질 탄화규소 세라믹스의 저온 제조공정
엄정혜, 장두희, 김영욱, 송인혁1, 김해두1
서울시립대학교 신소재공학과
1한국기계연구원 세라믹재료그룹
Low Temperature Processing of Porous Silicon Carbide Ceramics by Carbothermal Reduction
Jung-Hye Eom, Doo-Hee Jang, Young-Wook Kim, In-Hyuck Song1, Hai-Doo Kim1
Department of Materials Science and Engineering, the University of Seoul
1Ceramic Materials Group, Korea Institute of Machinery and Materials
A low temperature processing route for fabricating porous SiC ceramics by carbothermal reduction has been demonstrated. Effects of expandable microsphere content, sintering temperature, filler content, and carbon source on microstructure, porosity, compressive strength, cell size, and cell density were investigated in the processing of porous silicon carbide ceramics using expandable microspheres as a pore former. A higher microsphere content led to a higher porosity and a higher cell density. A higher sintering temperature resulted in a decreased porosity because of an enhanced densification. The addition of inert filler increased the porosity, but decreased the cell density. The compressive strength of the porous ceramics decreased with increasing the porosity. Typical compressive strength of porous SiC ceramics with ${sim}70%$ porosity was ${sim}13 MPa$.
Key words: Porous ceramics, Silicon carbide, Carbothermal reduction, Processing, Porosity
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