Article ID Journal Published Year Pages File Type
1469046 Corrosion Science 2014 9 Pages PDF
Abstract

•A novel Ru/NiAlHf coating was produced on Ni-based single crystal superalloy.•The Ru/NiAlHf coating effectively constrained secondary reaction zone in the alloy.•The Ru/NiAlHf coating revealed excellent cyclic oxidation resistance at 1100 °C.•The roles of Ru/Hf in affecting the oxidation and interdiffusion were investigated.

NiAl and NiAlHf/Ru coatings were produced onto nickel-based single crystal superalloy to investigate the interdiffusion behaviour and cyclic oxidation resistance at 1100 °C. A ∼30 μm thick layer, mainly consisting of needle-like topologically close-packed phases (TCP) and secondary reaction zone (SRZ), was formed in the NiAl coated superalloy after annealing at 1100 °C for 100 h, whereas the precipitates of TCP and SRZ were effectively constrained in the NiAlHf/Ru coated alloy. The NiAlHf/Ru coating exhibited superior cyclic oxidation resistance as compared to the NiAl coating. The roles of Ru and Hf in affecting interdiffusion and cyclic oxidation were discussed.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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