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J. Korean Ceram. Soc. > Volume 47(2); 2010 > Article
Journal of the Korean Ceramic Society 2010;47(2): 157.
doi: https://doi.org/10.4191/kcers.2010.47.2.157
출발 SiC 입자 크기가 Si3N4-Bonded SiC 세라믹스의 질화율과 강도에 미치는 영향
최영훈, 김영욱, 우상국1, 한인섭1
서울시립대학교 신소재공학과
1한국에너지기술연구원 에너지재료연구센터
Effect of Starting SiC Particle Size on Nitridation and Strength of Silicon Nitride-Bonded Silicon Carbide Ceramics
Young-Hoon Choi, 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
Effect of starting SiC particle size on nitridation rate and flexural strength of $Si_3N_4$-bonded-SiC (SNBSC) ceramics was investigated by using SiC particles of different size (${sim}200;{mu}m$, ${sim}100;{mu}m$ and ${sim}45;{mu}m$). The specimen prepared from smaller SiC particles resulted in higher nitridation rate after nitridation at $1450^{circ}C$, owing to the lower packing density in green body. The flexural strength showed maxima after 1-h nitridation for all specimens and then decreased with prolonged nitridation because of local densification-induced pore coarsening. The specimen prepared from smaller SiC particles showed better flexural strength because of smaller pore size and partly higher nitridation rate in the specimen. A maximal flexural strength of 29 MPa was obtained in the specimen with a density of $2.04;g{cdot}cm^3$, which was prepared from $45;{mu}m$-SiC particles.
Key words: Silicon carbide, Silicon nitride, Silicon nitride-bonded silicon carbide, Nitridation rate, Flexural strength
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