Surface Rumpling Behavior of Hf/Zr Single-Doped and Co-Doped β-NiAl Coatings during High-Temperature Cyclic Oxidation
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructures of As-Deposited Coatings
3.2. Cyclic Oxidation of the Coatings at 1150 °C
3.3. Mechanism of Rumpling
4. Conclusions
- The coatings revealed similar oxidation rate and good oxide scale adhesion during the cyclic oxidation. Hf/Zr co-doping did not show any obvious synergetic effect in that the oxidation rate of the co-doped coating was not further decreased.
- The coatings exhibited different extents of surface rumpling after 100 h cyclic oxidation, while Hf/Zr co-doping effectively alleviated surface rumpling.
- The mismatch of CTE, the martensitic transformation and the phase transformation from β to γ′ contributed to the surface rumpling during the cyclic oxidation, and among them, the third factor is likely to be responsible for the discrepancy in rumpling extents between the single-doped and co-doped coatings.
Author Contributions
Funding
Conflicts of Interest
References
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Ni | Co | Cr | Mo | W | Al | Ta | Re | Hf | Y |
---|---|---|---|---|---|---|---|---|---|
Bal. | 8.17 | 8.11 | 1.25 | 1.64 | 13.84 | 2.33 | 0.97 | 0.05 | 0.01 |
Coating Sample | Ni | Al | Hf | Zr |
---|---|---|---|---|
NiAl–Hf | Bal. | 45.98 | 0.96 | - |
NiAl–Zr | Bal. | 45.34 | - | 1.03 |
NiAl–Hf–Zr | Bal. | 45.63 | 0.49 | 0.49 |
Regions | Ni | Al | Hf | Zr | Cr | Co | W |
---|---|---|---|---|---|---|---|
A | 65.54 | 23.83 | 2.74 | - | 3.24 | 4.65 | - |
B | 56.40 | 34.85 | 0.19 | - | 3.88 | 4.68 | - |
C | 63.71 | 23.26 | - | 2.93 | 3.54 | 5.10 | 1.47 |
D | 55.23 | 35.15 | - | 0.28 | 4.00 | 4.83 | 0.51 |
E | 62.09 | 21.40 | 3.57 | 3.32 | 3.31 | 5.23 | 1.09 |
F | 55.77 | 34.98 | 0.21 | 0.25 | 3.96 | 4.20 | 0.63 |
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Wang, S.; He, J.; Song, H.; Liang, S.; Peng, H.; Guo, H. Surface Rumpling Behavior of Hf/Zr Single-Doped and Co-Doped β-NiAl Coatings during High-Temperature Cyclic Oxidation. Coatings 2020, 10, 874. https://doi.org/10.3390/coatings10090874
Wang S, He J, Song H, Liang S, Peng H, Guo H. Surface Rumpling Behavior of Hf/Zr Single-Doped and Co-Doped β-NiAl Coatings during High-Temperature Cyclic Oxidation. Coatings. 2020; 10(9):874. https://doi.org/10.3390/coatings10090874
Chicago/Turabian StyleWang, Shixing, Jian He, Honghai Song, Sijia Liang, Hui Peng, and Hongbo Guo. 2020. "Surface Rumpling Behavior of Hf/Zr Single-Doped and Co-Doped β-NiAl Coatings during High-Temperature Cyclic Oxidation" Coatings 10, no. 9: 874. https://doi.org/10.3390/coatings10090874