PRODUCTION OF HfTaTiNbZrC5 HIGH-ENTROPY CARBIDE MICROPOWDER IN THE PLASMA OF AN ATMOSPHERIC PRESSURE ARC DISCHARGE

HfTaTiNbZrC5 high-entropy carbide micropowder has been synthesized using the technique of direct-current plasma arc discharge at atmospheric pressure. The synthesis was carried out in air atmosphere under conditions of the formation of a protective carbon monoxide gas layer. TiO₂, ZrO₂, Nb₂O₅, HfO₂, and Ta₂O₅ oxide metal powders included in the composition of high-entropy carbide with characteristic grain dimensions of 5–10 μm have been used as raw feedstock. It has been shown that it takes at least 90–100 s for the formation of high-entropy carbide to occur from raw feedstock under the action of arc discharge plasma. The advantage of the proposed method of producing high-entropy carbide micropowder compared to other similar methods is the short time of synthesis of such powder with low energy expenditure (~960 kJ/g) and the possibility of using simple equipment for synthesis.
   
Author:  A.Ya. Pak, P. S. Grinchuk, G. Ya. Mamontov, T. Yu. Yakich, and A. A. Gumovskaya
Keywords:  high-entropy carbide, electric-arc synthesis, vacuum-free method, atmospheric plasma
Page:  88