热障涂层TGO与热疲劳损伤的激光超声无损检测机理与关键技术研究

项目名称： 热障涂层TGO与热疲劳损伤的激光超声无损检测机理与关键技术研究

项目编号： No.51205240

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 机械工程学科

项目作者： 赵扬

作者单位： 山东省科学院

项目金额： 26万元

中文摘要： 航空发动机涡轮叶片表面热障涂层的脱落是引发事故主要因素之一，热障涂层无损检测与评价技术研究已成为航空等众多领域的迫切工程需求。针对引起热障涂层脱落两个主要因素：TGO（Thermally Growth Oxide）和热疲劳损伤，本项目提出利用激光超声技术结合频谱分析技术对TGO厚度进行实时检测的方法研究；创建双脉冲激光激励共线性混频表面波的非接触式非线性超声检测技术，进行热障涂层热疲劳损伤程度的无损检测方法研究。探索TGO厚度变化对超声波纵波声速的影响和热障涂层热疲劳损伤程度对非线性超声参量（包括混频波的干涉频率和相位值）的影响，对揭示TGO厚度与超声波纵波声速之间的本构关系和热疲劳损伤程度与非线性参量之间的本构关系具有重要意义，为工程实际中TGO厚度和热疲劳损伤的实时检测提供了依据，并为创建具有我国自主知识产权的航空发动机热障涂层TGO厚度和热疲劳损伤超声无损检测与评价技术奠定了基础。

中文关键词： 无损检测；激光超声；热障涂层；TGO；热疲劳

英文摘要： The stripping of TBC (thermal barrier coating) on the surface of aero-engine turbine blade is one of the major factors that cause the accident, thus the nondestructive testing and evaluation technique of TBC has become the urgent requirements in many fields, including the aviation field. The TGO (Thermally Growth Oxide) and thermal fatigue are the two major factors that result in the stripping of TBC, therefore, we propose to combine laser ultrasonic technique with spectrum analysis technique used to nondestructively measure the thickness of TGO, and we create a novel nonlinear ultrasonic testing technique based on the collinear mixing frequency SAW(surface acoustic wave) excited by the double pulse laser , in order to characterize the thermal fatigue in this work.The influence of TGO thickness on the ultrasonic longitudinal velocity and the influence of thermal fatigue on the nonlinear acoustic parameter(including the interference frequency and the phase of mixing frequency SAW) are explored in the present work, which are important to reveal the constitutive relation between the TGO thickness and ultrasonic longitudinal velocity, and the relation between the thermal fatigue and the nonlinear acoustic parameter, respectively. The present work provides the basis of real-time nondestructive testing for TGO and th

英文关键词： Nondestructive testing；Laser ultrasonic；Thermal barrier coating；Thermally growth oxide；Thermal fatigue