The Role Of The Surface Morphology And Segmented Cracks On The Damage Forms Of Laser Re-Melted Thermal Barrier Coatings In Presence Of A Molten Salt (Na2So4 + V2O5)

Keywords

A. Ceramic; A. Molten salts; C. High temperature corrosion; C. Intergranular corrosion; C. Oxidation

Abstract

Hot corrosion behaviour of yttria-stabilized zirconia thermal barrier coatings (TBCs) with various segmented cracks and surface morphologies, obtained using ultrasonic-assisted laser re-melting, was investigated during exposure to Na2SO4 + V2O5salt at 1100 °C. It is demonstrated, that the damage types of TBCs were significantly affected by segmented cracks and surface morphology. Four main damage mechanisms: (i) chemical reaction, (ii) Coefficient thermal mismatch stress, (iii) oxidation of bond coating and (iv) intergranular corrosion, based on the observed transport behaviour of oxygen and molten salt, stress-tolerance and self-healing of various segmented cracks, were discussed to account for the failure behaviour.

Publication Date

2-1-2017

Publication Title

Corrosion Science

Volume

115

Number of Pages

56-67

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.corsci.2016.11.011

Socpus ID

85006810370 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85006810370

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