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J. Korean Ceram. Soc. > Volume 47(6); 2010 > Article
Journal of the Korean Ceramic Society 2010;47(6): 578.
doi: https://doi.org/10.4191/kcers.2010.47.6.578
ZrB2-SiC 세라믹스의 미세구조와 기계적 물성에 미치는 B4C 첨가효과
채정민, 이성민, 오윤석, 김형태, 김경자, 남산1, 김성원
한국세라믹기술원 엔지니어링세라믹센터
1고려대학교 신소재공학과
Effect of B4C Addition on the Microstructures and Mechanical Properties of ZrB2-SiC Ceramics
Jung-Min Chae, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Kyung-Ja Kim, Sahn Nahm1, Seong-Won Kim
Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology
1Department of Advanced Materials Engineering, Korea University
$ZrB_2$ has a melting point of $3245^{circ}C$ and a relatively low density of $6.1;g/cm^3$, which makes this a candidate for application to ultrahigh temperature environments over $2000^{circ}C$. Beside these properties, $ZrB_2$ is known to have excellent resistance to thermal shock and oxidation compared with other non-oxide engineering ceramics. In order to enhance such oxidation resistance, SiC was frequently added to $ZrB_2$-based systems. Due to nonsinterability of $ZrB_2$-based ceramics, research on the sintering aids such as $B_4C$ or $MoSi_2$ becomes popular recently. In this study, densification and high-temperature properties of $ZrB_2$-SiC ceramics especially with $B_4C$ are investigated. $ZrB_2$-20 vol% SiC system was selected as a basic composition and $B_4C$ or C was added to this system in some extents. Mixed powders were sintered using hot pressing (HP). With sintered bodies, densification behavior and high-temperature (up to $1400^{circ}C$) properties such as flexural strength, hardness, and so on were examined.
Key words: Ultra-high temperature ceramics (UHTCs), $ZrB_2$-SiC, $B_4C$ addition, High-temperature mechanical properties
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