High Entropy Ultra-high Temperature Ceramics Composites​

The development of a new class of multi-component ultra-high temperature ceramics (MC-UHTCs), often referred to as high entropy (HE) UHTCs, has gained increased interest due to the possibility of improved thermo-mechanical and oxidation properties. The study is focused on the fabrication of binary, ternary and quaternary phase UHTCs to understand the effect of several components on its thermo-mechanical behavior. the mechanical properties improved exceptionally with the addition of components with a hardness of 15.2 GPa, 33.6 GPa, and 34.8 GPa, respectively, for binary, ternary, and quaternary UHTC systems. The resistance to indentation damage was curtailed in (Ta,Nb,Hf)C and (Ta,Nb,Hf,Ti)C when compared to (Ta,Nb)C sample, respectively up to ~58% and ~72% at 200 N.