Abstract
ZrB₂ has a melting point of 3245℃ and a relatively low density of 6.1 g/㎤, which makes this a candidate for application to ultrahigh temperature environments over 2000℃. Beside these properties, ZrB₂ 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 ZrB₂?based systems. Due to nonsinterability of ZrB₂?based ceramics, research on the sintering aids such as B₄C or MoSi₂ becomes popular recently. In this study, densification and high-temperature properties of ZrB₂-SiC ceramics especially with B₄C are investigated. ZrB₂-20 vol% SiC system was selected as a basic composition and B₄C 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℃) properties such as flexural strength, hardness, and so on were examined.
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