A novel thermal insulation material for ultra-high temperature applications: Hierarchical porous high-entropy ceramics

Thermal insulation material is a critical part of the thermal protection system (TPS) of hypersonic vehicles. Recently, high-entropy ceramics have attracted great attention in thermal insulation for their low thermal conductivity due to the scattering of phonons by multi-components and distorted lattices. Among the various options available, porous high-entropy carbide (PHEC) ceramics have emerged as promising candidates for TPS due to their inherent characteristics such as high melting point, excellent high-temperature stability, low density, and superior thermal insulation properties.