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首页> 外文会议>Developments in strategic materials and computational design V >INVESTIGATION OF SURFACE GEOMETRY THERMAL BARRIER COATINGS USING COMPUTED X-RAY TOMOGRAPHY
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INVESTIGATION OF SURFACE GEOMETRY THERMAL BARRIER COATINGS USING COMPUTED X-RAY TOMOGRAPHY

机译：X射线计算机断层摄影术研究表面几何热障涂层

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摘要

Thermal barrier coatings (TBCs) are essential part of gas turbine engines; Due to multilayer anatomy of TBCs, different measurement and imaging techniques are being utilized for their characterization. Use of non-destructive measurement techniques to characterize factors contributing to the failure is in particular of great interest as premature spallation of the TBCs is a major concern for their use. In this work, the feasibility of use of computed X-ray tomography (Micro CT) for characterizing TBCs is discussed. It has been shown mat image acquisition parameters in addition to post-processing of the images have to be modified and optimized based on the region of interest in TBCs. The optimized acquisition and post-processing parameters have been introduced and their effects on the quality of images are demonstrated. Finally, the feasibility of repeatable and quantitative analysis of TBCs is studied. These analyses include bond coat surface geometry change (rumpling) analysis, top coat surface geometry change analysis, and quantifying the relation between the top coat and bond coat surface parameters. The limitations and challenges are introduced and suggested remedies are discussed and their effectiveness is demonstrated. For any analysis for recording changes in any layers of TBC, a high repeatability is a must. It has been shown that suggested procedures can lead to obtaining the repeatability required for the mentioned analyses.
机译：隔热涂层（TBC）是燃气涡轮发动机的重要组成部分。由于TBC的多层解剖结构，不同的测量和成像技术被用于表征。由于TBC的过早散裂是其使用的主要关注点，因此使用无损测量技术来表征导致故障的因素尤为重要。在这项工作中，讨论了使用计算机X射线断层扫描（Micro CT）表征TBC的可行性。已经示出，除了图像的后处理之外，还必须基于TBC中的关注区域来修改和优化垫图像获取参数。介绍了优化的采集和后处理参数，并演示了它们对图像质量的影响。最后，研究了TBCs重复性和定量分析的可行性。这些分析包括粘结层表面几何形状变化（起皱）分析，面漆表面几何形状变化分析，以及量化面漆和粘结层表面参数之间的关系。介绍了局限性和挑战，并讨论了建议的补救措施，并证明了其有效性。对于记录TBC各个层中的变化的任何分析，必须具有很高的可重复性。已经表明，建议的程序可以导致获得上述分析所需的可重复性。

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