TY - JOUR
T1 - High-temperature performance of Pt-modified Ni-20Co-28Cr-10Al-0.5Y coating
T2 - Formation mechanism of Pt-rich overlayer and its effect on thermally grown oxide failure
AU - Yu, Chuntang
AU - Pu, Wanqi
AU - Li, Shuai
AU - Bao, Zebin
AU - Cheng, Renju
AU - Jiang, Chengyang
AU - Liu, Zhengliang
AU - Zhang, Wei
AU - Zhang, Lei
AU - Zhao, Suibo
AU - Xie, Hanqing
AU - Zhu, Shenglong
AU - Wang, Fuhui
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/5/25
Y1 - 2023/5/25
N2 - A Pt-modified NiCoCrAlY coating was prepared on N5 via arc ion plating (AIP), Pt-electroplating, and subsequent vacuum annealing treatments. To perform a comparison between the properties of the modified and normal NiCoCrAlY coatings, the isothermal oxidation performances of the Pt-free and Pt-modified NiCoCrAlY coatings were evaluated at 1100 °C in static air. The results indicate that the Pt-rich overlayer on the Pt-modified NiCoCrAlY coatings exhibited superior oxidation resistance, and the adherent, thinner scale of α-Al2O3 inhibited the formation of detrimental (Ni, Co)(Cr, Al)2O4 spinel oxide. Furthermore, the addition of Pt effectively delayed the Al2O3 oxide phase transformation from θ to α in the early stage and markedly decreased the level of residual stress. The mechanism of forming the Pt-rich overlayer and its effect on thermally grown oxide (TGO) failure during high-temperature oxidation are discussed in detail, and the effect of Pt on improving the TGO growth, stress evolution, and spallation resistance are highlighted.
AB - A Pt-modified NiCoCrAlY coating was prepared on N5 via arc ion plating (AIP), Pt-electroplating, and subsequent vacuum annealing treatments. To perform a comparison between the properties of the modified and normal NiCoCrAlY coatings, the isothermal oxidation performances of the Pt-free and Pt-modified NiCoCrAlY coatings were evaluated at 1100 °C in static air. The results indicate that the Pt-rich overlayer on the Pt-modified NiCoCrAlY coatings exhibited superior oxidation resistance, and the adherent, thinner scale of α-Al2O3 inhibited the formation of detrimental (Ni, Co)(Cr, Al)2O4 spinel oxide. Furthermore, the addition of Pt effectively delayed the Al2O3 oxide phase transformation from θ to α in the early stage and markedly decreased the level of residual stress. The mechanism of forming the Pt-rich overlayer and its effect on thermally grown oxide (TGO) failure during high-temperature oxidation are discussed in detail, and the effect of Pt on improving the TGO growth, stress evolution, and spallation resistance are highlighted.
KW - Microstructure evolution
KW - NiCoCrAlY
KW - Pt-modification
KW - Thermally grown oxide (TGO)
UR - https://www.scopus.com/pages/publications/85151402824
U2 - 10.1016/j.surfcoat.2023.129422
DO - 10.1016/j.surfcoat.2023.129422
M3 - 文章
AN - SCOPUS:85151402824
SN - 0257-8972
VL - 461
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 129422
ER -