High-entropy carbonitrides with superior oxidation resistance: Fabrication and investigation of oxidation behavior under non-isothermal and isothermal conditions

Abstract

In this work, the influence of refractory Zr and Ti and their combination (Zr,Ti) on the oxidation behavior of the (Hf,Ta,Nb)(C,N) carbonitride under non-isothermal and isothermal conditions at 1200 °C was studied, the effect of nitrogen addition was demonstrated, and a possible oxidation mechanisms were identified. The best result was achieved for high-entropy carbonitride (Hf,Ta,Nb,Zr,Ti)(C,N). The introduction of nitrogen into the of high-entropy carbide lattice contributed to a decrease in the specific weight gain by 12 %, and the addition of Ti, Zr, and (Zr,Ti) to the (Hf,Ta,Nb)(C,N) – a decrease of 47, 65, and 83 %, respectively.