7% yttria stabilized zirconia (7YSZ) thermal barrier coatings (TBCs) prepared by air plasma spray were laser-remelted, and subsequently pre-heated and Al2O3 sol-gel repaired for restraining the crack growth in the remelted coatings. The as-prepared coatings were exposed to high temperature molten CaO-MgO-Al2O3-SiO2 (CMAS) to explore their corrosion resistance. The results show that both the laser remelted and the pre-heated, the laser-remelted coatings are densified by CMAS attack. In addition, the thickness of the densified layers is on the same order of that of the non-remelted coatings. Despite of this, the densified layer in the laser remelted coating repaired by Al2O3 sol-gel is much thinner than the other coatings. This indicates that Al2O3 sol-gel repairing coupling with laser-remelted method can effectively improve the CMAS resistance of 7YSZ TBCs due to the refractory anorthite generated during corrosion process. This refractory compound produced between CMAS and Al2O3 sol-gel is capable to decrease the mobility and corrosivity of the CMAS.
Improving molten CMAS resistance of thermal barrier coatings by modified laser remelting method
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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