| Abstrakt: |
Ultra-high temperature ceramics (UHTCs) consist of a mixture of different ceramics compounds like boride, carbide, diboride, and nitride of the transition metals. High-entropy ceramic (HEC) is a multi-component alloy similar to the high-entropy alloy (HEA) developed explicitly for hypersonic vehicles, nuclear reactors, and high-temperature applications. In the current study, mechanical alloying (MA) and spark plasma sintering (SPS) approaches were used to develop equiatomic high entropy nitride (HEN) (Hf0.2Nb0.2Ta0.2Ti0.2Zr0.2)N. High-entropy nitrides have been consolidated using the two-stage technique. All five elements were mechanically alloyed in the first stage using a planetary ball mill. In the second stage, they were sintered using spark plasma sintering at 1800°C, 1900°C, and 2000°C. The microstructure of the consolidated sample was then further studied using scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS). In addition, the material's mechanical, tribological, and oxidation characteristics were investigated. The compacted sample at a temperature of 2000°C exhibits a higher density, microhardness, and tribological properties. This sample demonstrates 1650 Hv microhardness, which is greater than the result of the rule of mixture. These findings will provide the road map for developing a novel high-entropy nitride ceramic for critical aerospace applications. [ABSTRACT FROM AUTHOR] |
Full text from SpringerLink