China claims super ceramics for nuclear reactors, hypersonic jets
Interesting Engineering • • health
Key Points:
- Scientists at Harbin University developed a novel two-step in-situ reactive spark plasma sintering process using ZrC, TiSi2, and B4C to produce ultra-high-temperature ceramics (UHTCs) with enhanced properties.
- The process involves a first step at 1600°C where TiSi2 reacts with B4C to form TiB2 and SiC, followed by a second step at 1800°C that promotes the formation of ZrSi2, secondary SiC, and solid solutions, improving densification and fracture resistance.
- This method results in a refined sub-microstructure with grain sizes below 500 nm, achieving a flexural strength of 824 ± 46 MPa and fracture toughness of
