热障涂层无损检测技术研究进展

为提高发动机的涡轮前温度和热端部件服役寿命，热障涂层（TBCs）被广泛应用于燃气涡轮发动机。热障涂层具有多相、多界面和非均质特性，且其服役工况恶劣复杂。寻找一种可以表征涂层显微组织、缺陷、热物性、应力等反映涂层质量和剩余寿命的无损检测方法，对发动机的热端部件安全性和可靠性至关重要。文中综述了超声检测技术（UT）、声发射技术（AE）、红外热成像技术（IRT）、阻抗谱技术（IS）和光激发荧光压电光谱技术（PLPS）的原理以及其在热障涂层无损检测中的研究应用，并详细介绍了太赫兹时域光谱（THz-TDS）技术及其在热障涂层中的应用。最后总结了上述无损检测方法的检测能力，并对热障涂层无损检测方法进行展望。

Research Progress on Non-destructive Testing Method of Thermal Barrier Coatings

Thermal barrier coatings (TBCs) are widely used in gas turbine engines to increase the gas inlet temperature of turbines and improve hot end component service life. TBCs are multi-phase, multi-interface and heterogeneous, and their service conditions are harsh and complex. Finding a non-destructive test method, which can reflect the coating quality and predict remaining life by characterizing coating microstructure, defects, thermal properties, stress, etc., is critical to the safety and reliability of the hot end components of the engine. In this paper, the principles of ultrasonic testing (UT), acoustic emission technology (AE), infrared thermography (IRT), impedance spectroscopy (IS) and photoluminescence piezo spectroscopy (PLPS) were summarized and their applications in nondestructive testing of thermal barrier coatings were presented. The terahertz time-domain spectroscopy (THz-TDS) technique and its application in thermal barrier coatings were introduced in detail. Finally, the detection abilities of the above non-destructive testing methods were summarized, and the non-destructive testing methods of thermal barrier coatings were prospected.