The Ultra High Temperature Ceramics (UHTCs) represent a very interesting family of materials and therefore they are the subject of increasing attention from different engineering sectors and notably the aerospace industry. Indeed, hypersonic flights, re-entry vehicles, propulsion applications and so on, require new materials that can perform in oxidizing or corrosive atmospheres at temperatures...

The thermal expansion of polycrystalline LaB6–MeB2 ceramic composites (where Me denotes Ti, Zr, Hf) has been studied experimentally within the temperature range from 20 °C to 1500 °C. These were obtained by crucible-free float zone melting method. first interval with a negative elongation (NTE) (~1000–1100 °C) coincided in and LaB6 hexaboride was associated La–La atomic bond softening. hierarch...

Nanostructuring boron-rich materials should significantly impact their thermal and electrical transport properties. Nonetheless, nanostructured monoliths of such could not be achieved in the 10 nm range so far, because large temperatures required to synthesize produce compounds. Such a nanostructuration may have important consequences for achieving trade-off between enhanced low conductivity ma...