| 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 |
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| ABSTRACT |
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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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