Effect of γ′ Phase Elements on Oxidation Behavior of Nanocrystalline Coatings at 1050 °C
Abstract
:1. Introduction
2. Experiment
3. Results and Discussion
4. Conclusions
- (1)
- The high-temperature oxidation resistance of the nanocrystalline coating on the single crystal superalloy of N5 is better. When the coating is serviced at 1050 °C, it will be covered by Al2O3.
- (2)
- Ta contained γ’ phase in the N5 nanocrystalline coating, which ruined its oxide’s purity and integrity after oxidation.
- (3)
- The oxide scale of the K38G nanocrystalline coating is divided into two parts: the inner one is made up of Al2O3, and the outer one is mainly composed of NiCr2O42. In addition, TiO2 and Ta2O5 can be detected.
- (4)
- Excessive γ′ elements will affect the purity of the oxide scale on nanocrystalline coatings, and then affect the oxidation kinetics and microstructure results.
Author Contributions
Funding
Institutional Review Board Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Elements | Al | Ti | Ta | Co | Cr | Mo | W | Re | Ni |
---|---|---|---|---|---|---|---|---|---|
K38G | 3.0 | 3.5 | 1.5 | 9 | 16 | 1.5 | 2.5 | 0 | Bal. |
N5 | 6.2 | 0 | 6.5 | 7.5 | 7 | 1.5 | 5 | 3 | Bal. |
Parameters | Value |
---|---|
Argon pressure | 0.2 Pa |
Current | 3.5 A |
Temperature | 200 °C |
Elements | Ni | O | Al | Ta | Ti | Cr | Co |
---|---|---|---|---|---|---|---|
a | 24.8 | 34.6 | 6.8 | 1.4 | 15.0 | 15.0 | 2.4 |
b | 25.7 | 33.4 | 20.3 | 2.6 | 2.5 | 10.7 | 4.8 |
c | 11.9 | 40.3 | 39.9 | 1.8 | 0 | 3.6 | 2.5 |
d | 6.8 | 45.1 | 42.2 | 0.9 | 2.0 | 1.8 | 1.2 |
e | 14.4 | 42.3 | 3.6 | 0.7 | 25.0 | 10.8 | 3.2 |
f | 14.1 | 46.0 | 26.0 | 4.8 | 5.3 | 2.6 | 1.2 |
g | 3.2 | 41.3 | 35.8 | 18.1 | 0 | 1.1 | 0.5 |
h | 4.5 | 40.7 | 33.2 | 20.3 | 0 | 0.7 | 0.6 |
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Wang, J.; Yang, L.; Yang, S.; Jia, Y.; Chen, M.; Qiao, Y.; Guo, P.; Zhu, S.; Wang, F. Effect of γ′ Phase Elements on Oxidation Behavior of Nanocrystalline Coatings at 1050 °C. Materials 2021, 14, 202. https://doi.org/10.3390/ma14010202
Wang J, Yang L, Yang S, Jia Y, Chen M, Qiao Y, Guo P, Zhu S, Wang F. Effect of γ′ Phase Elements on Oxidation Behavior of Nanocrystalline Coatings at 1050 °C. Materials. 2021; 14(1):202. https://doi.org/10.3390/ma14010202
Chicago/Turabian StyleWang, Jinlong, Lanlan Yang, Shasha Yang, Yixuan Jia, Minghui Chen, Yanxin Qiao, Pingyi Guo, Shenglong Zhu, and Fuhui Wang. 2021. "Effect of γ′ Phase Elements on Oxidation Behavior of Nanocrystalline Coatings at 1050 °C" Materials 14, no. 1: 202. https://doi.org/10.3390/ma14010202