Microstructure modification of Y2O3 stabilized ZrO2 thermal barrier coatings by laser glazing and the effects on the hot corrosion resistance
| Autor: | Hui Xin, Lei Guo, Zhao Zhang, Xinmu Zhang, Fuxing Ye |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
air plasma spraying (APS)
Materials science 02 engineering and technology Y2O3 stabilized ZrO2 engineering.material 01 natural sciences Corrosion Thermal barrier coating lcsh:TP785-869 Coating microstructure modification 0103 physical sciences Molten salt Composite material Dissolution Yttria-stabilized zirconia 010302 applied physics laser glazing thermal barrier coatings (TBCs) 021001 nanoscience & nanotechnology Microstructure Electronic Optical and Magnetic Materials Glazing lcsh:Clay industries. Ceramics. Glass Ceramics and Composites engineering 0210 nano-technology V2O5 corrosion |
| Zdroj: | Journal of Advanced Ceramics, Vol 9, Iss 2, Pp 232-242 (2020) |
| ISSN: | 2227-8508 2226-4108 |
| Popis: | Y2O3 stabilized ZrO2 (YSZ) thermal barrier coatings (TBCs) are prone to hot corrosion by molten salts. In this study, the microstructure of atmospheric plasma spraying YSZ TBCs is modified by laser glazing in order to improve the corrosion resistance. By optimizing the laser parameters, a ∼18 µm smooth glazed layer with some vertical cracks was produced on the coating surfaces. The as-sprayed and modified coatings were both exposed to hot corrosion tests at 700 and 1000 °C for 4 h in V2O5 molten salt, and the results revealed that the modified one had improved corrosion resistance. After hot corrosion, the glazed layer kept structural integrity, with little evidence of dissolution. However, the vertical cracks in the glazed layer acted as the paths for molten salt penetration, accelerating the corrosion of the non-modified coating. Further optimization of the glazed layer is needed in the future work. |
| Databáze: | OpenAIRE |
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