Effect of TGO on the tensile failure behavior of thermal barrier coatings
Effect of TGO on the tensile failure behavior of thermal barrier coatings
复制标题
TGO对热障涂层拉伸破坏行为的影响
DOI：
10.1007/s11465-019-0541-2
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发表时间：
2019-12
影响因子：
4.5
通讯作者：
Tao Liu
中科院分区：
文献类型：
--
作者：
Le Wang;Yuelan Di;Ying Liu;Haoxing You;Tao Liu
热障涂层经高温氧化后会生成热生长氧化物(TGO)。TGO增加了涂层的内应力，导致涂层的剥落。用扫描电子显微镜和能谱仪研究了TGO经0、10、30和50h高温氧化后的生长特征、微观结构和成分，并对结果进行了系统的比较。利用声发射技术和数字图像相关技术，测量了涂层在静载荷作用下的声发射信号和表面应变。结果表明，随着氧化时间的延长，TGO逐渐长大增厚。在拉伸载荷作用下，增厚的TGO在TGO与粘结层的界面上优先出现多条裂纹，延缓了涂层表面的应变。TGO的生长导致在TGO与粘结层之间的界面处产生了气孔。TGO在拉伸载荷下产生的气孔延迟了表面裂纹的产生，从而延长了热障涂层的失效时间。
Thermally grown oxide (TGO) may be generated in thermal barrier coatings (TBCs) after high-temperature oxidation. TGO increases the internal stress of the coatings, leading to the spalling of the coatings. Scanning electron microscopy and energy-dispersive spectroscopy were used to investigate the growth characteristics, microstructure, and composition of TGO after high-temperature oxidation for 0, 10, 30, and 50 h, and the results were systematically compared. Acoustic emission (AE) signals and the strain on the coating surface under static load were measured with AE technology and digital image correlation. Results showed that TGO gradually grew and thickened with the increase in oxidation time. The thickened TGO had preferential multi-cracks at the interface of TGO and the bond layer and delayed the strain on the surface of the coating under tensile load. TGO growth resulted in the generation of pores at the interface between the TGO and bond layer. The pores produced by TGO under tensile load delayed the generation of surface cracks and thus prolonged the failure time of TBCs.
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