Synthesis of Ultra-High-Temperature Ta4HfC5–HfB2 Composites by Electro-thermal Explosion under Pressure

Ultra-high-temperature Ta4HfC5–HfB2 composites were prepared by electrothermal explosion (ETE) under pressure in a one-stage process, with special emphasis on the influence of high-energy ball milling (HEBM) of starting Ta–Hf–C–B powder mixtures. Synthesized Ta4HfC5–HfB2 composites had a grain size smaller than 0.2 μm and a porosity of 10–12%. A synthesized composite has high temperature resistance at heating in the flame of an oxygen-acetylene burner.