Abstract
A novel NiAlDy/RuNiAl coating was deposited onto a Ni-based single crystal superalloy DD3. The cyclic oxidation and interdiffusion of the NiAlDy/RuNiAl coating and a NiAlDy coating at 1100 °C were investigated. For the NiAlDy coating, secondary reaction zone (SRZ) consisting of γ′, γ and σ-topologically-closed-packed phase (σ-TCP) needles was formed in the superalloy after 100. h annealing. The NiAlDy/RuNiAl coating effectively suppressed the formation of SRZ as the RuNiAl layer worked as a buffer layer. Premature scale spallation was observed on the NiAlDy coating after about 80. h cyclic oxidation, whereas the NiAlDy/RuNiAl coating exhibited improved oxidation-resistance property.
| Original language | English |
|---|---|
| Pages (from-to) | 2721-2727 |
| Number of pages | 7 |
| Journal | Corrosion Science |
| Volume | 53 |
| Issue number | 9 |
| DOIs | |
| State | Published - Sep 2011 |
Keywords
- A. Metal coatings
- A. Superalloys
- B. Thermal cycling
- C. Interfaces
- C. Oxidation
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