Optimalization of Thermal Barrier Coating Systems on the Basis of Complicated Failure Analysis under Thermal - Mechanical - Chemical Loadings

从全球环境保护等方面的要求来看，热障涂层作为先进燃气轮机热截面部件（如叶片和喷嘴导叶）的一项重要技术正在发展。然而，由于TBS系统通常受到由热力学和热化学组成的复杂载荷模式，其复杂的失效行为方式及其预防方法很难得到阐明。在对具有系统材料参数的TBC体系进行失效分析的基础上，建立了具有较强抗复杂热-机械-化学载荷条件的高性能TBC体系。首先，静态载荷下TBC系统机械失效的基本方面与涂层的微观结构表征（如喷涂粉末、喷涂方法和后热处理条件）有关。此外，通过在空气和热腐蚀环境中的热力学测试进行了系统的失效分析，这具有重要的实际意义。在此基础上，对TBC系统的优化设计进行了探讨，以提高TBC系统的性能。并提出了今后需要明确的研究课题。

Thermal barrier coatings (TBCs) are growing up as an essential technology for hot section components of advanced gas turbines such as blades and nozzle guide vanes that tend to be operated at much higher temperature which is demanded from the viewpoints of global environmental protection and so forth. However, since TBS systems are usually subjected to the complicated modes of loadings composed of thermomechanical and thermochemical, the complicated manners of failure behavior and its prevention methodology are hardly clarified.In the present research work has been made in order to establish the optimalized high performance TBC systems with improved resistance against the complicated thermal- mechanical chemical loadings condition, on the basis of the failure analysis of TBC systems with systematic materials parameters. At the first, fundamental aspect of the mechanical failure for TBC systems under the static loadings in relation with the microstructural characterization of coatings such as the spraying powder, spraying method and post heat-treatment conditions. Furthermore, systemic failure analyses were conducted through the thermomechanical testings in air and in hot corrosive environment which is practically important. On the basis of results obtained, the optimalization of TBC system design for improving the performance was discussed. Moreover, the research subjects to be clarified in near future were referred.