This paper reports the microstructure of hot-pressed ZrB2-SiC ceramics with added B4C as characterized by transmission electron microscopy. ZrB2 has a melting point of 3245°C, a relatively low density of 6.1 g/cm3, and specific mechanical properties at an elevated temperature, making it a candidate for application to environments with ultra-high temperatures which exceed 2000°C. Due to the non-sinterability of ZrB2-based ceramics, research on sintering aids such as B4C or MoSi2 has become prominent recently. From TEM investigations, an amorphous layer with contaminant oxide is observed in the vicinity of B4C grains remaining in hot-pressed ZrB2-SiC ceramics with B4C as an additive. The effect of a B4C addition on the microstructure of this system is also discussed.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites