ZrB2 has a melting point of 3245°C and a relatively low density of 6.1 g/cm3, which makes this a candidate for application to ultrahigh temperature environments over 2000°C. Beside mese 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 ZrB 2-based systems. Due to nonsinterability of ZrB2-based ceramics, research on the sintering aids such as B4C or MoSi 2 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°C) properties such as flexural strength, hardness, and so on were examined.
- BC addition
- High-temperature mechanical properties
- Ultra-high temperature ceramics (UHTCs)
ASJC Scopus subject areas
- Ceramics and Composites