热障涂层(TBCs)具有良好的隔热性能,是燃气轮机高温部件的关键材料,在高温服役过程中,涂层脱落会导致部件工作失效,因此为获得长寿命热障涂层,涂层的脱落失效机理是急需深入研究的问题.综述了热应力、α-Al2O3生长、外应力、热生长氧化层(TGO)起伏及孔隙率等缺陷对涂层应力发展的影响,探讨了微裂纹的产生、扩展及脱落的失效过程,最后展望了研究热障涂层失效及提高涂层寿命的努力方向和前景.
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