Lifetime improvement of EB-PVD 7YSZ TBCs by doping of Hf or Zr in NiCoCrAlY bond coats
نویسندگان
چکیده
Rare earth elements have a great positive influence on the oxidation behavior and thereby lifetime of TBC systems. A commonly used EB-PVD NiCoCrAlY bondcoat was doped by Hf Zr in range 0.1–1 at.%. More than 3000 cycles were achieved Hf-doping 0.15?0.6 at.% which is large improvement. BCs provide high lifetimes about 2800 with low doping content 0.3 Microstructural changes, especially TGO, including formation initially transient alumina, rare precipitates, TGO evolution time examined detail.
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ژورنال
عنوان ژورنال: Corrosion Science
سال: 2021
ISSN: ['1879-0496', '0010-938X']
DOI: https://doi.org/10.1016/j.corsci.2020.109205