The oxidation behaviour of NbC-13.5(wt%)Ni, NbC-5.7MoC-13.3Ni and WC-12Co was compared to that of equimolar quinary (TiVNbTaW)C-10Ni and non-equimolar senary (TiVNbTaMoW)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 and Ni(Mo,W)O. The NbC-based cermets showed the least oxidation resistance and formed a porous oxide layer of NbO and (Nb,Ni)O, 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.

中文翻译：

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NbC-Ni、WC-Co和高熵碳化物-镍基金属陶瓷氧化行为的对比研究


将NbC-13.5(wt%)Ni、NbC-5.7MoC-13.3Ni和WC-12Co的氧化行为与等摩尔五元(TiVNbTaW)C-10Ni和非等摩尔六元(TiVNbTaMoW)C-10Ni高熵氧化行为进行比较碳化物 (HEC)-Ni 金属陶瓷。等温氧化实验在 700 °C 下进行，而非等温量热实验则进行以确定氧化的起始温度。 HEC基金属陶瓷表现出优异的抗氧化性和独特的氧化层形貌，这归因于形成了主要由(Ti,V,Nb,Ta,Ni)O和Ni(Mo,W)O组成的化学复合氧化物鳞片。 NbC 基金属陶瓷表现出最低的抗氧化性，并形成 NbO 和 (Nb,Ni)O 的多孔氧化物层，而 WC-Co 相对于 HEC-Ni 基金属陶瓷表现出中等氧化行为。所有复合材料均遵循线性氧化速率定律，并且六元 HEC 金属陶瓷表现出最慢的氧化动力学。