A comparative study on the oxidation behaviour of NbC-Ni, WC-Co, and high entropy carbide-Ni based cermets
Source abstract
Abstract
The oxidation behaviour of NbC-13.5(wt%)Ni, NbC-5.7Mo 2C-13.3Ni and WC-12Co was compared to that of equimolar quinary (Ti 0.2V 0.2Nb 0.2Ta 0.2W 0.2)C-10Ni and non-equimolar senary (Ti 0.2V 0.2Nb 0.2Ta 0.2Mo 0.1W 0.1)C-10Ni high entropy carbide (HEC)-Ni cermets. Isothermal oxidation experiments were performed at 700 °C, whereas non-isothermal calorimetric experiments were conducted to determine the onset temperature of oxidation. HEC-based cermets exhibited superior oxidation resistance and a unique oxide layer morphology, which was attributed to the formation of a chemically complex oxide scale mainly consisting of (Ti,V,Nb,Ta,Ni)O x and Ni(Mo,W)O 4. The NbC-based cermets showed the least oxidation resistance and formed a porous oxide layer of Nb 2O 5 and (Nb,Ni)O x, whereas WC-Co showed an intermediate oxidation behaviour with respect to the HEC-Ni based cermets. All composites followed a linear oxidation rate law, and the senary HEC cermet demonstrated the slowest oxidation kinetics.
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