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首页> 外文会议>AIAA/SAE/ASEE joint propulsion conference;AIAA propulsion and energy forum >Non-Destructive Evaluation of Thermal Barrier Coating Damage and Molten Sand Deposits on Gas Turbine Engine Components via Scanning Acoustic Microscopy
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Non-Destructive Evaluation of Thermal Barrier Coating Damage and Molten Sand Deposits on Gas Turbine Engine Components via Scanning Acoustic Microscopy

机译：扫描声学显微镜对燃气轮机发动机组件热障涂层损伤和熔砂沉积物的无损评估

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Emerging challenges in gas turbine engine (GTE) and thermal barrier coating (TBC) technology require the maturation of non-destructive evaluation (NDE) techniques to streamline and bring down costs of materials and component level research and development. In this paper, Scanning Acoustic Microscopy (SAM) is demonstrated to be an effective way for evaluating molten sand accumulation, due to melting of ingested sand and environmental particulates, on the surface and internal channels of nozzle vanes of GTE components evaluated in a full scale engine test. The use of transducers with a wide range of frequencies makes this a versatile technique for assessing both macroscalc damage such as cracking and delamination, as well as mesoscale characteristics such as the porosity of sand deposits. In this paper, SAM studies are conducted using both a 15 MHz transducer for evaluation of the entire nozzle doublet, and a 100 MHz transducer to characterize sand accumulation and porosity with higher resolution. SAM enables determination of surface cooling hole blockage, internal channel sand accumulation, and characterization of the molten sand scales on the surface. In addition, utilizing simpler geometries (i.e., button cells), it is possible to assess damage on TBCs exposed to sand laden combustion environments. Comparative analysis of an as-deposited air plasma sprayed (APS) TBC and an APS TBC exposed to sand laden combustion environments is conducted to assess the effectiveness of NDE TBC damage detection via SAM.
机译：燃气涡轮发动机（GTE）和热障涂层（TBC）技术中出现的新挑战要求成熟的无损评估（NDE）技术可以简化并降低材料和组件级研究与开发的成本。在本文中，扫描声显微镜（SAM）被证明是一种有效的方法，用于评估熔融的沙子积聚，这是由于吞入的沙子和环境微粒在全部GTE组件的喷嘴叶片的表面和内部通道上熔化造成的，发动机测试。使用具有广泛频率范围的换能器使该技术成为一种通用技术，可用于评估宏观颗粒的破坏（例如破裂和分层）以及中尺度特征（例如沙沉积的孔隙度）。在本文中，SAM研究是使用15 MHz传感器（用于评估整个喷嘴双峰）和100 MHz传感器（用于以更高的分辨率表征沙子积聚和孔隙度）进行的。 SAM能够确定表面冷却孔是否堵塞，内部通道中的沙子积聚以及表征表面上的熔融砂垢。另外，利用更简单的几何形状（即纽扣电池），可以评估暴露于含沙燃烧环境下的TBC的损坏。对沉积的空气等离子喷涂（APS）TBC和暴露于含沙燃烧环境的APS TBC进行了比较分析，以评估通过SAM检测NDE TBC损伤的有效性。

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