Abstract The interface oxidation induced microstructural evolution of air plasma spayed (APS) thermal barrier coatings (TBCs) is investigated. As the oxidation progresses, the thermally grown oxide (TGO) formed at the YSZ/NiCrAlY interface develops from a bi-layered structure, to a three-layered structure, then to a four-layered structure of Al2O3, Y3Al5O12 (YAG), NiCr2O4 and NiO, respectively. An oxidation mechanism is proposed to account for the growth of the layered TGO. The YAG formation consumes the underlying alumina layer and facilitates the outward diffusion of Cr and Ni, leading to a detrimental effect on the TBC life.

中文翻译：

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APS热障涂层的YSZ/NiCrAlY界面氧化

摘要 研究了空气等离子喷涂 (APS) 热障涂层 (TBC) 的界面氧化诱导微观结构演变。随着氧化的进行，在 YSZ/NiCrAlY 界面处形成的热生长氧化物 (TGO) 从双层结构发展为三层结构，然后发展为 Al2O3、Y3Al5O12 (YAG)、NiCr2O4 的四层结构和 NiO，分别。提出了一种氧化机制来解释层状 TGO 的生长。YAG 的形成消耗了下面的氧化铝层并促进了 Cr 和 Ni 的向外扩散，从而对 TBC 寿命产生不利影响。