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Quantitative evaluation of thermal barrier coating based on eddy current technique

机译：基于涡流技术的隔热涂层定量评估

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摘要

Thermal Barrier Coating (TBC), as the insulation between high-temperature gas and the alloying bodies of gas turbine blades, is adopted for protection and long-term service of gas turbines. It is imperative to non-destructively evaluate TBC of blades, since the TBC with thin thickness or delamination will lead to catastrophic accidents of gas turbines. In this paper, Eddy Current inspection (EC) is proposed for quantitative evaluation of TBC, which involves estimation of: (1) thickness of the top coating to identify possible thinning and (2) thickness and conductivity of bond coating to detect delamination and degradation. In an effort to implement the fast inversion, the closed-form expressions of the Jacobian matrix are derived based on Truncated Region Eigenfunction Expansion (TREE) modeling. The Levenberg-Marquardt (LM) algorithm is also adopted in the inversion for the parameters. The proposed inverse algorithm is verified by hybrid numerical modeling and experiments, which indicates that the quantitative evaluation of TBC by using EC in conjunction with the proposed inverse algorithm is valid and applicable to the engineering application.
机译：热障涂层（TBC）作为高温气体与燃气轮机叶片合金体之间的绝缘材料，被用于燃气轮机的保护和长期使用。必须对叶片的TBC进行非破坏性评估，因为厚度薄或分层的TBC会导致燃气轮机发生灾难性事故。在本文中，提出了涡流检测（EC）来对TBC进行定量评估，该估计包括以下方面的估计：（1）顶层涂层的厚度以识别可能的变薄；（2）粘结涂层的厚度和导电率以检测分层和降解。 。为了实现快速反演，基于截断区域特征函数展开（TREE）模型导出了雅可比矩阵的闭式表达式。参数的反演也采用Levenberg-Marquardt（LM）算法。通过混合数值建模和实验验证了所提出的逆算法，表明EC结合提出的逆算法对TBC进行定量评估是有效的，可应用于工程应用。

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  • 来源
    《NDT & E international》 |2012年第2012期|p.29-35|共7页
  • 作者

    Yong Li; Zhenmao Chen; Ying Mao; Yong Qi;

  • 作者单位

    State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, ShaanXi, Xi'an, 710049, PR China Research Centre for Inspection and Evaluation of Nuclear Structural Integrity, Xi'an Jiaotong University, ShaanXi, Xi'an, 710049, PR China;

    State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, ShaanXi, Xi'an, 710049, PR China Research Centre for Inspection and Evaluation of Nuclear Structural Integrity, Xi'an Jiaotong University, ShaanXi, Xi'an, 710049, PR China;

    State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, ShaanXi, Xi'an, 710049, PR China;

    State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, ShaanXi, Xi'an, 710049, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    electromagnetic nondestructive evaluation; thermal barrier coating; eddy current inspection; inversion; analytical modeling;

    机译：电磁无损评估;隔热涂层;涡流检查;反转分析建模;

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