Fabrication of high-entropy carbide ceramics (Ti,Zr,Hf,Nb,Ta)C through low-temperature calcium-hydride reduction of oxides

Preparation of (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C high‐entropy ceramic nanopowders via liquid‐phase precursor

“…Feng et al 26 prepared high-entropy ceramic (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )C powders with an average particle size of about 550 nm and oxygen content of 0.2 wt.% by two steps of carbothermal reduction and solid solution at 2000 • C, using metal oxides and carbon black as raw materials. Yudin et al 27 used a new method to synthesize high-entropy carbide ceramics (Ti, Zr, Hf, Nb, Ta)C by low-temperature calcium hydride reduction, the specific operation steps of which include roller milling, vacuum hot press sintering, water-acid treatment, washing, filtration and drying, etc. The process was complex and required further research and optimization.…”