NDLI: Isothermal Oxidation TGO Growth Behaviors of Laser-Remolten LZO/YSZ Thermal Barrier Coatings

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Isothermal Oxidation TGO Growth Behaviors of Laser-Remolten LZO/YSZ Thermal Barrier Coatings

Content Provider	MDPI
Author	Li, Wensheng Li, Ziyu An, Guosheng Cheng, Bo Song, Qiang Sun, Jinquan Vaganov, Victor Wang, Can Ming Goransky, Georg
Copyright Year	2022
Description	Laser scanning modification was applied to secondarily melt the top ceramic coating surface of lanthanum zirconate/yttria-stabilized zirconia double ceramic thermal barrier coatings (LZO/YSZ TBCs) to reduce the gas oxygen diffusion and improve the TBCs service life. Isothermal oxidations with different times were carried out on the as-sprayed (AS) TBCs and laser-remolten (LR) TBCs at 1100 °C to investigate thermally growth oxide (TGO)growth mechanisms and isothermal oxidation behaviors. The results showed that the laser-remolten top-ceramic-coating dense layer with a columnar crystal structure of LR TBCs presented a 96.3% and 59.1% lower surface roughness and porosity, respectively, than those of the top ceramic coating of AS TBCs, and the TGO growth rate of LR TBCs decreased by 46.2% compared to that of AS TBCs. The mixed-oxides appearance time of LR TBCs (50 h) was later than that of AS TBCs (25 h). After 100 h of isothermal oxidation, the total TGO thickness of LR TBCs was only 77.2% of that of AS TBCs, and the effects of the laser-remolten TBCs on gas oxygen diffusion inhibition and high-temperature oxidation resistance were promising in LZO/YSZ TBCs.
Starting Page	107
e-ISSN	20796412
DOI	10.3390/coatings12020107
Journal	Coatings
Issue Number	2
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2022-01-18
Access Restriction	Open
Subject Keyword	Coatings Coatings and Films Lzo/ysz Tbcs Laser-remolten Layer Isothermal Oxidation Tgo Growth Oxidation Resistance
Content Type	Text
Resource Type	Article

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