Synthesis of Ta4HfC5 Ceramics with a Submicron Structure by Electro-Thermal Explosion under Pressure

摘要

Ultra-high-temperature Ta4HfC5 ceramics with a submicron structure has been manufactured from a 4Ta + Hf + 5C powder mixture by electro-thermal explosion under pressure. The effect of the duration of mechanical activation of starting 4Ta + Hf powder mixtures on the structure of the resulting precursor has been studied. It has been demonstrated that mechanical activation in hexane for 40-60 min leads to amorphization of metals and nucleation of crystallites of the carbide phase with a cubic structure. This makes it possible to synthesize a single-phase solid solution of tantalum and hafnium carbides with a submicron structure in the course of an electro-thermal explosion.