燃气轮机热障涂层劣化的阻抗研究

董晓克, 张浩, 檀玉, 蔡宇航, 苑维铭, 梁可心, 张胜寒

doi:10.16577/j.issn.1001-1560.2024.0150

材料保护 >

2024 , Vol. 57 >Issue 7: 52 - 58

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0150

研究篇

燃气轮机热障涂层劣化的阻抗研究

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(1. 华北电力大学 (保定) 环境科学与工程系, 河北保定 071000;2. 唐钢国际工程技术有限公司, 河北唐山 063000)

檀玉(1981－),博士,讲师,从事金属腐蚀与防护研究,电话:13582625117,E-mail:lucifertan＠163.com

收稿日期: 2023-11-17

修回日期: 2024-01-24

录用日期: 2024-01-30

网络出版日期: 2024-08-16

基金资助

北京市自然科学基金项目(2192051)

收起

Impedance Study of Thermal Barrier Coating Deterioration in Gas Turbines

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(1.Department of Environment Science and Engineering, North China Electric Power University (Baoding), Baoding 071000, China；2.Tangsteel International Engineering Technology Co., Ltd., Tangshan 063000, China)

TAN Yu (1981－), Ph.D., Lecturer, Research Focus: Corrosion and Protection of Metal, Tel.: 13582625117,E-mail: lucifertan＠163.com

Received date: 2023-11-17

Revised date: 2024-01-24

Accepted date: 2024-01-30

Online published: 2024-08-16

Supported by

Beijing Natural Science Foundation (2192051)

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摘要

热障涂层(TBC)的一些固有特性(如多孔性、较薄的厚度、相当高的电阻率)使传统常温无损检测技术存在一定应用局限，为此，提出了一种在高温环境下利用阻抗谱法监测热障涂层中氧化物生长的方法，基于阻抗谱测试原理，通过分析交流阻抗在不同频率域下的响应以及相角信息获得热障涂层中氧化物的生长信息，并结合SEM 微观形貌，构建预测模型。结果表明:在1 000 ℃高温氧化不同时间后，发现在陶瓷层和粘接层之间形成了一条致密的深色热生长氧化物(TGO)层，其厚度随着氧化时间的延长而增加，并且呈现出非线性关系。随着氧化时间的延长，TGO 层的成分从氧化初期的Al2O3向Al2O3(主要)、Cr2O3、CoO、NiO 的混合氧化物过渡。通过建立适当的电路模型拟合阻抗谱数据，建立了TGO 层电阻与氧化时间的关系，从而证实了阻抗谱法在热障涂层高温退化过程中进行无损检测的可行性。

关键词： 交流阻抗; 热障涂层; 实机温度; 劣化过程; 无损检测

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董晓克, 张浩, 檀玉, 蔡宇航, 苑维铭, 梁可心, 张胜寒 . 燃气轮机热障涂层劣化的阻抗研究[J]. 材料保护, 2024 , 57(7) : 52 -58 . DOI: 10.16577/j.issn.1001-1560.2024.0150

Abstract

Some inherent characteristics of thermal barrier coatings (TBC), such as porosity, thinner thickness and relatively high electrical resistivity, limit the application of traditional room temperature non-destructive testing techniques.Therefore, a method for monitoring oxide growth in thermal barrier coatings using impedance spectroscopy in high-temperature environments was proposed.Based on the principle of impedance spectroscopy test, the growth information of oxides in thermal barrier coatings was obtained by analyzing the response of AC impedance in different frequency domains and phase angle information, and the prediction model was constructed based on the micromorphology of SEM.Results showed that after oxidizing at 1 000 ℃for different times, a dense dark thermally grown oxide (TGO) layer was formed between the ceramic layer and the adhesive layer, and its thickness increased with the prolongation of oxidation time, exhibiting a non-linear relationship.As the oxidation time prolonged, the composition of the TGO layer transitions from Al2O3 in the early stage of oxidation to a mixed oxide of Al2O3 (mainly), Cr2O3, CoO and NiO.Furthermore, the relationship between the resistance of the TGO layer and the oxidation time was constructed by establishing an appropriate circuit model to fit the impedance spectrum data, which confirmed the feasibility of non-destructive testing using impedance testing technology in the process of high-temperature degradation of thermal barrier coatings.

Key words： AC impedance; thermal barrier coating; actual machine temperature; deterioration process; nondestructive testing

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