ASSESSMENT OF NI-CR-AL HIGH-TEMPERATURE DETONATION COATINGS UNDER OPERATIONAL CONDITIONS

This study evaluates the high-temperature durability and oxidation resistance of homogeneous and gradient Ni-Cr-Al detonation coatings applied to 12Kh1MF steel substrates. Samples were exposed to operational conditions in a power plant for two weeks, simulating high-temperature industrial environments. The research utilizes X-ray diffraction (XRD) and scanning electron microscopy (SEM) to analyze phase stability, surface morphology, and structural integrity of the coatings before and after thermal exposure. Findings reveal that gradient coatings outperform homogeneous ones, demonstrating superior oxidation resistance and reduced susceptibility to thermal stress-induced microcracks. The multi-layered oxide structure and compositional gradient of the gradient coatings contribute to their enhanced thermal stability and long-term durability. In contrast, homogeneous coatings exhibited surface roughness and microcracks, which may compromise their longevity under extreme conditions. These insights emphasize the advantages of gradient Ni-Cr-Al coatings for high-temperature applications, highlighting their potential for improved performance and reliability in demanding industrial settings. The study bridges knowledge gaps regarding the long-term behavior of these coatings, aiding their optimization for critical applications. Keywords: High-temperature coating, power plant, Ni-Cr-Al coating, detonation technology, steel 12Kh1MF.