Effect of La2O3 on Microstructure and Thermal Conductivity of La2O3-Doped YSZ Coatings
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and Preparation
2.2. Microstructures of Coatings
2.3. Thermal Conductivity Measurements
3. Results and Discussion
3.1. Morphology and Phase Analysis
3.2. Thermal Conductivity of Coatings
4. Conclusions
- The main reason for lower thermal conductivity is attributed to the smaller grain size of La-YSZ TBCs, especially the narrower width of the grains.
- The relative amount of “recrystallized” and “deformed” grains for La-YSZ TBCs is much higher than that for YSZ TBCs. Thus, the reduction of grain size for La-YSZ TBCs is due to the increase of the melting index of grains, which attributed to the enlargement of the lattice parameter caused by La3+ doping.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Spraying Conditions | N1 | N2 | N3 | N4 |
---|---|---|---|---|
Current (A) | 600 | 550 | 650 | 600 |
Ar (L/min) | 36 | 36 | 36 | 36 |
H2 (L/min) | 12 | 12 | 12 | 12 |
Velocity (m/s) | 200 | 208 | 213 | 211 |
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Guo, X.; Lin, C.; Zhang, J.; Liu, Z.; Jiang, C.; Zheng, W.; Zeng, Y. Effect of La2O3 on Microstructure and Thermal Conductivity of La2O3-Doped YSZ Coatings. Materials 2019, 12, 2966. https://doi.org/10.3390/ma12182966
Guo X, Lin C, Zhang J, Liu Z, Jiang C, Zheng W, Zeng Y. Effect of La2O3 on Microstructure and Thermal Conductivity of La2O3-Doped YSZ Coatings. Materials. 2019; 12(18):2966. https://doi.org/10.3390/ma12182966
Chicago/Turabian StyleGuo, Xiaojie, Chucheng Lin, Jimei Zhang, Ziwei Liu, Caifen Jiang, Wei Zheng, and Yi Zeng. 2019. "Effect of La2O3 on Microstructure and Thermal Conductivity of La2O3-Doped YSZ Coatings" Materials 12, no. 18: 2966. https://doi.org/10.3390/ma12182966