热障涂层失效机理研究进展

热障涂层(TBCs)具有良好的隔热性能,是航空发动机和燃气轮机高温部件的关键材料.在高温服役状态,涂层的剥落会导致严重的问题,因此涂层的失效机理是热障涂层研究中急需解决的关键问题.除了受到热应力的影响以外,涂层的失效还受到热生长氧化物(TGO)的生成和长大的影响,本文介绍了粘结层的氧化、TGO的生成和长大以及微裂纹的产生、扩展、直到剥离脱落的整个失效过程;探讨了影响热障涂层失效的若干因素,并对其进行的各种改性研究进行了概述,分析总结了热障涂层失效相关研究的发展趋势.

Progress of Research on the Failure Mechanism of Thermal Barrier Coatings

Thermal barrier coatings(TBCs) is one of the important materials of turbines for propulsion and power generation with excellent thermal insulation properties.At high temperature,the failure of TBCs will lead to serious problems,so the failure mechanisms is the hotspot of TBCs research.The microcracks caused by thermal stress and the TGO formation and growth will cause the failure of TBCs.The whole failure progress,such as the oxidation of the BC,the TGO growth process,initiation and propagation of the microcracks are reviewed in this paper.The factors led to the final failure are discussed,and the recent research progress on improving the lifetime of TBCs is summarized.In addition,the trend of the failure mechanism of thermal barrier coatings is described.