Bogdan Mariusz, Zieliński Witold, Płociński Tomasz, Kurzydłowski Krzysztof Jan
Department of Mechanical Engineering, Bialystok Technical University, 45 Wiejska, 15333 Białystok, Poland.
Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02507 Warszawa, Poland.
Materials (Basel). 2020 Jul 21;13(14):3240. doi: 10.3390/ma13143240.
The effects of exposure to overheating (temperature above 1000 °C) on the degradation (modification) of layers of coatings (coatings based on aluminum) of uncooled polycrystalline rotor blades of aircraft turbine jet engines were investigated under laboratory conditions. In order to determine the nature of the changes as well as the structural changes in the various zones, a multi-factor analysis of the layers of the coating, including the observation of the surface of the blades, using, among others, electron microscopy, structural tests, surface morphology, and chemical composition testing, was carried out. As a result of the possibility of strengthening the physical foundations of the non-destructive testing of blades, the undertaken research mainly focused on the characteristics of the changes occurring in the outermost layers of the coatings. The obtained results indicate the structural degradation of the coatings, particularly the unfavorable changes, become visible after heating to 1050 °C. The main, strongly interacting, negative phenomena include pore formation, external diffusion of Fe and Cr to the surface, and the formation and subsequent thickening of Fe-Cr particles on the surface of the alumina layer.
在实验室条件下，研究了暴露于过热环境（温度高于1000°C）对航空涡轮喷气发动机未冷却多晶转子叶片涂层（基于铝的涂层）层降解（改性）的影响。为了确定变化的性质以及不同区域的结构变化，对涂层层进行了多因素分析，包括使用电子显微镜等观察叶片表面、进行结构测试、表面形态分析和化学成分测试。由于有可能加强叶片无损检测的物理基础，所开展的研究主要集中在涂层最外层发生的变化特征上。获得的结果表明，涂层的结构降解，特别是不利变化，在加热到1050°C后变得明显。主要的、强烈相互作用的负面现象包括孔隙形成、Fe和Cr向表面的外扩散以及氧化铝层表面Fe-Cr颗粒的形成和随后的增厚。
