Comparison of Hot Corrosion Behaviors of Plasma-Sprayed Segmented Structure and Conventional YSZ Thermal Barrier Coatings under a Fused Na2SO4-V2O5 Salt Film

Yi Wang; Yi Chen Meng; Hongli Suo; Pan Wang

doi:10.4028/www.scientific.net/AMR.1061-1062.234

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1061-1062Comparison of Hot Corrosion Behaviors of...

Comparison of Hot Corrosion Behaviors of Plasma-Sprayed Segmented Structure and Conventional YSZ Thermal Barrier Coatings under a Fused Na₂SO₄-V₂O₅ Salt Film

Abstract:

A modified YSZ thermal barrier coating (TBC) was prepared by simultaneously depositing two components, NiCrAlY and YSZ, on nicked-based superalloy DZ125 via atmospheric plasma spraying. In this study, the sodium salt was deposited on substrate surface. After being heated at 950°C for 50min, the specimens were cooled to ambient temperature within 10 min. The specimens were recoated after each 10 cycles. Subsequently, the corrosion products were analyzed via X-Ray diffraction and SEM. The results indicated that deterioration of YSZ coating mainly resulted from generation of chemical interaction. Conversely, abnormal growth of TGO and enrichment of molten salt around segmentation crack were not observed in the modified YSZ thermal barrier coating. Moreover, the modified YSZ-TBC exhibited higher thermal resistance than traditional YSZ-TBC in the thermal cycling testing.

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Periodical:

Advanced Materials Research (Volumes 1061-1062)

Pages:

234-239

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1061-1062.234

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Online since:

December 2014

Authors:

Yi Wang*, Yi Chen Meng, Hongli Suo, Pan Wang

Keywords:

Coating, Cracks, Hot-Corrosion, Plasma-Spraying

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