Photothermal measurement of material properties for translucent thermal barrier coatings

IF 4.1 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Ndt & E International Pub Date : 2024-10-01 DOI:10.1016/j.ndteint.2024.103245

Yijiao Ma , Wenyi Xu , Jinrong Qi , Xue Yang , Lichun Feng , Xiaoli Li , Ning Tao , Cunlin Zhang , Jiangang Sun

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Abstract

In this study, a photothermal nondestructive method was proposed to measure the material parameters of semi-transparent or translucent thermal barrier coatings (TBCs). We derived a theoretical model for the photothermal signal from a two-layer semi-infinite material system with a translucent first layer after a pulse laser excitation. Its solution was verified by numerical solution. A data regression algorithm based on a least-squares fitting was used for the determination of the material parameters in the translucent first layer material. To verify this new method, an experimental system was set up with a pulse laser for thermal excitation and an infrared camera for image acquisition of the thermal emission transient from several translucent EBPVD TBC samples. The predicted coating thickness is consistent with the measured value by an optical microscope. The predicted thermal conductivity and optical attenuation coefficients in the absorption and emission band are found to be in good agreement with reference values.

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光热测量半透明隔热涂层的材料特性

本研究提出了一种光热无损方法，用于测量半透明或半透明隔热涂层（TBC）的材料参数。我们推导出了一个双层半透明材料系统（第一层为半透明材料）在脉冲激光激发后产生光热信号的理论模型。并通过数值求解对其进行了验证。基于最小二乘拟合的数据回归算法被用于确定半透明第一层材料的材料参数。为了验证这一新方法，建立了一个实验系统，使用脉冲激光器进行热激发，并使用红外摄像机采集几个半透明 EBPVD TBC 样品的热发射瞬态图像。预测的涂层厚度与光学显微镜的测量值一致。预测的热导率以及吸收和发射波段的光衰减系数与参考值十分吻合。

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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来源期刊

Ndt & E International 工程技术-材料科学：表征与测试

CiteScore

7.20

自引率

9.50%

发文量

121

审稿时长

55 days

期刊介绍： NDT&E international publishes peer-reviewed results of original research and development in all categories of the fields of nondestructive testing and evaluation including ultrasonics, electromagnetics, radiography, optical and thermal methods. In addition to traditional NDE topics, the emerging technology area of inspection of civil structures and materials is also emphasized. The journal publishes original papers on research and development of new inspection techniques and methods, as well as on novel and innovative applications of established methods. Papers on NDE sensors and their applications both for inspection and process control, as well as papers describing novel NDE systems for structural health monitoring and their performance in industrial settings are also considered. Other regular features include international news, new equipment and a calendar of forthcoming worldwide meetings. This journal is listed in Current Contents.