The influence of varying carbon content on the microstructure and mechanical properties was studied in the (V,Nb,Ta,Ti,W)C - 12 vol% Ni system, allowing to define the carbon window for eta and graphite phase formation. Microstructure and phase analysis were performed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron probe microanalysis (EPMA), and the transverse rupture strength (TRS), Vickers hardness and Palmqvist fracture toughness were measured. The results elucidate the influence of the carbon content on the eutectic temperature, carbide grain size and morphology, phase stability and mechanical properties in high entropy carbide (V,Nb,Ta,Ti,W)C-Ni cermets. The phase stability and chemical reactivity with steel of the High Entropy Carbide (HEC) cermets was assessed in static interaction couples at 1200°C, and compared with that of a conventional WC-Co cemented carbide.

在 (V,Nb,Ta,Ti,W)C - 12 vol% Ni 系统中研究了不同碳含量对微观结构和机械性能的影响，从而定义了 eta 和石墨相形成的碳窗口。通过扫描电子显微镜（SEM）、X射线衍射（XRD）和电子探针显微分析（EPMA）进行显微组织和物相分析，并测量了横向断裂强度（TRS）、维氏硬度和Palmqvist断裂韧性。结果阐明了碳含量对高熵碳化物 (V,Nb,Ta,Ti,W)C-Ni 金属陶瓷的共晶温度、碳化物晶粒尺寸和形貌、相稳定性和力学性能的影响。高熵碳化物 (HEC) 金属陶瓷的相稳定性和与钢的化学反应性在 1200°C 的静态相互作用对中进行了评估，