Rare earth elements have a great positive influence on the oxidation behavior and thereby on the lifetime of TBC systems. A commonly used EB-PVD NiCoCrAlY bondcoat was doped by Hf and Zr in a range of 0.1–1 at.%. More than 3000 cycles were achieved by Hf-doping in a range of 0.15−0.6 at.% Hf which is a large improvement. Zr doped BCs provide high lifetimes of about 2800 cycles with a low doping content of 0.3 at.%. Microstructural changes, especially in the TGO, including formation of initially transient alumina, rare earth precipitates, and TGO evolution with time were examined in detail.

中文翻译：

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通过在NiCoCrAlY键合涂层中掺杂Hf或Zr来改善EB-PVD 7YSZ TBC的使用寿命

稀土元素对氧化行为有很大的积极影响，从而对TBC系统的寿命也有很大的影响。常用的EB-PVD NiCoCrAlY粘结涂层被Hf和Zr掺杂的范围为0.1–1 at。％。通过在0.15-0.6 at。％Hf范围内掺杂Hf，可以实现3000多个循环，这是一个很大的进步。掺Zr的BC具有约2800个循环的高寿命，掺杂量低至0.3 at。％。详细检查了微观结构的变化，尤其是在TGO中的变化，包括最初的瞬态氧化铝的形成，稀土沉淀以及TGO随时间的演变。