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http://dx.doi.org/10.4191/KCERS.2010.47.6.578

Effect of B4C Addition on the Microstructures and Mechanical Properties of ZrB2-SiC Ceramics  

Chae, Jung-Min (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Lee, Sung-Min (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Oh, Yoon-Suk (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Kim, Hyung-Tae (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Kim, Kyung-Ja (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Nahm, Sahn (Department of Advanced Materials Engineering, Korea University)
Kim, Seong-Won (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.47, no.6, 2010 , pp. 578-582 More about this Journal
Abstract
$ZrB_2$ 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.
Keywords
Ultra-high temperature ceramics (UHTCs); $ZrB_2$-SiC; $B_4C$ addition; High-temperature mechanical properties;
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