A Dynamic Testing Approach for Particulate Erosion-Corrosion for Gas Turbine Coatings

Jamesa Stokes, Michael Presby
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Abstract

Particle interactions in engines can be complex phenomena leading to degradation of thermal (TBCs) and environmental barrier coatings (EBCs) meant to protect engine components. Ingestion of particles into the engine can lead to recession of coatings due to particle erosion. Similarly, these particles can become molten, adhere to coatings and result in thermochemical corrosion of coating materials. Erosion testing is often carried out where particles are injected into a gas stream, accelerated within a nozzle, and impinge on samples. Conversely, most molten particle corrosion testing is often done in static furnaces, which does not capture the dynamic nature of deposition. Nevertheless, these damage mechanisms are often tested separately, and no standard exists to test both erosive/corrosive particle interactions with coating materials under relevant turbine operating conditions. Understanding the synergies of particle interactions is crucial in determining operating lifetimes of potential coating materials. Such considerations emphasize the need for realistic approaches in standardizing particle interaction testing in combustion environments. This study outlines efforts at NASA Glenn's Erosion Burner Rig Facility in improving dynamic erosion/corrosion testing methods by assessing the durability of state-of-the-art (SOA) TBC 7 wt.% yttria stabilized zirconia (7YSZ) as a function of particle deposition rate, burner temperature, and particle size. Calibration data to determine particle deposition rate will be presented, and mass and optical profilometry measurements were utilized to estimate mass/volume loss versus deposition per increment of particulate used. Electron microscopy analyses were then carried out to assess coating damage after testing.
燃气轮机涂层微粒侵蚀-腐蚀动态测试方法
发动机中的微粒相互作用是一种复杂的现象,会导致用于保护发动机部件的热防护涂层(TBC)和环境防护涂层(EBC)降解。由于颗粒的侵蚀,发动机中的颗粒摄入会导致涂层脱落。同样,这些颗粒也会熔化,附着在涂层上,导致涂层材料的热化学腐蚀。腐蚀测试通常是将颗粒注入气流,在喷嘴内加速并撞击样品。相反,大多数熔融颗粒腐蚀测试通常在静态熔炉中进行,无法捕捉沉积的动态性质。尽管如此,这些破坏机制通常都是单独测试的,目前还没有在相关涡轮机运行条件下测试颗粒与涂层材料的侵蚀/腐蚀相互作用的标准。了解颗粒相互作用的协同作用对于确定潜在涂层材料的运行寿命至关重要。这种考虑强调了在燃烧环境中标准化颗粒相互作用测试的现实方法的必要性。本研究概述了 NASA 格伦腐蚀燃烧器钻机设施在改进动态侵蚀/腐蚀测试方法方面所做的努力,评估了最先进的(SOA)TBC 7 wt.%钇稳定氧化锆(7YSZ)的耐久性与颗粒沉积率、燃烧器温度和颗粒大小的函数关系。将介绍用于确定颗粒沉积速率的校准数据,并利用质量和光学轮廓测量法来估算每增量颗粒的质量/体积损失与沉积的关系。然后进行电子显微镜分析,以评估测试后的涂层损坏情况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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