多层结构热障涂层是燃气轮机热端部件的关键热防护材料。其中，过渡层（粘接层和热生长氧化层）的力学性能与行为对热障涂层的耐久性有重要影响。然而由于其尺寸微小，结构复杂，且服役环境苛刻，相关的实验表征方法较为匮乏，损伤失效的机理不够明确。鉴于此，本项目拟以过渡层为研究对象，发展高温光测力学方法与技术，针对其关键力学参数、热力耦合行为与宏微观应力进行表征与分析。即发展多尺度跨界面的高温散斑制备技术，研制热力耦合光学测试系统；通过多层结构几何构型设计与弹性理论推导，建立基于喷涂/未喷涂区域之间应变差异的高温弹性模量测试模型；结合光学全场变形测试、微结构及表面形貌表征，阐明复杂环境下过渡层的力学性能劣化与皱曲演化等服役损伤机制，并揭示界面失效模式；发展宏微观应力测试方法，系统分析曲面过渡层的应力分布规律。最终为热障涂层失效机理的阐明奠定基础。

Multilayered thermal barrier coatings (TBCs) are key materials for thermal protection of metallic components in gas-turbine engines. The mechanical properties and behaviour of interlayers (bond layer and thermally grown oxide) have a significant influence on the durability of TBCs. However, due to the reduced dimensionality, complex structure and demanding operating environment, the experimental characterization methods are deficient, and the damage failure mechanism remains unclear. Accordingly, with interlayers as the object of research, this project aims to develop methods and techniques of high-temperature optical mechanics, to characterize and analyse their key mechanical constants, thermo-mechanical coupling behaviour and macro/micro stress. Specifically, to develop fabrication techniques of multiscaled high-temperature speckles across interface and thermo-mechanical coupling optical system; by means of multilayered geometry design and elastic theory derivation, to build a high-temperature elastic modulus testing model based on the strain difference between coated and uncoated parts; combined with optical full-field deformation measurement, microstructure and surface shape characterization, to clarify the damage mechanism of interlayers in complex environment, such as mechanical properties degradation and rumpling evolution, and then to reveal the failure modes of interface; to develop measurement methods of macro/micro stress, and to systematically analyse stress distribution of curved interlayers. Ultimately, laying a foundation for the elucidation of failure mechanism of TBCs.