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http://dx.doi.org/10.4191/kcers.2015.52.6.462

Transmission Electron Microscopy Investigation of Hot-pressed ZrB2-SiC with B4C Additive  

Kim, Seongwon (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
Chae, Jung-Min (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
Lee, Sung-Min (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
Oh, Yoon-Suk (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
Kim, Hyung-Tae (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
Jang, Byung-Koog (High Temperature Materials Unit, National Institute of Materials Science)
Publication Information
Journal of the Korean Ceramic Society / v.52, no.6, 2015 , pp. 462-466 More about this Journal
Abstract
This paper reports the microstructure of hot-pressed $ZrB_2$-SiC ceramics with added $B_4C$ as characterized by transmission electron microscopy. $ZrB_2$ has a melting point of $3245^{\circ}C$, a relatively low density of $6.1g/cm^3$, and specific mechanical properties at an elevated temperature, making it a candidate for application to environments with ultra-high temperatures which exceed $2000^{\circ}C$. Due to the non-sinterability of $ZrB_2$-based ceramics, research on sintering aids such as $B_4C$ or $MoSi_2$ has become prominent recently. From TEM investigations, an amorphous layer with contaminant oxide is observed in the vicinity of $B_4C$ grains remaining in hot-pressed $ZrB_2$-SiC ceramics with $B_4C$ as an additive. The effect of a $B_4C$ addition on the microstructure of this system is also discussed.
Keywords
Ultra-high-temperature ceramics (UHTCs); $ZrB_2$-SiC; $B_4C$ addition; Densification;
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Times Cited By KSCI : 1  (Citation Analysis)
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