Evaluation of hot corrosion of 8YSZ coatings elaborated by suspension plasma spraying

In this paper, the evaluation microscopic of hot corrosion of 8mol% Yttria Stabilized Zirconia (8YSZ) coatings was studied in the presence of V2O5 and Na2SO4 as corrosive molten salt, for 40h at 1050°C. First, the substrates of Inconel 718 super-alloy were sprayed with a NiCrCoAl-Y2O3 bond coat by a...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Conference series 2017-01, Vol.786 (1), p.12018
Main Authors: González-Hernández, A G, Ageorges, H, López-Gómez, M E
Format: Article
Language:English
Subjects:
Ceramic coatings
Chemical reactions
Corrosion tests
High temperature
Hot corrosion
Molten salts
Physics
Plasma spraying
Scanning electron microscopy
Substrates
Superalloys
Yttria-stabilized zirconia
Yttrium oxide
Zirconium dioxide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper, the evaluation microscopic of hot corrosion of 8mol% Yttria Stabilized Zirconia (8YSZ) coatings was studied in the presence of V2O5 and Na2SO4 as corrosive molten salt, for 40h at 1050°C. First, the substrates of Inconel 718 super-alloy were sprayed with a NiCrCoAl-Y2O3 bond coat by atmospheric plasma spraying (APS). Then this bond coat was polished for elaborated the 8YSZ layer by suspension plasma spraying (SPS). The microstructure of the cross-section and surface of the coating was evaluated by scanning electron microscopy (SEM). After the hot corrosion test, the delamination of 8YSZ coatings was occurred in the ceramic layer due to the creation of stress resulting from the chemical reaction between the molten salts and the yttria (Y2O3) of 8YSZ coating at high temperature. According to EDS-SEM analysis, the evaluation of fractured sections of 8YSZ coating showed mainly the formation of crystals composed by Y, V, O and the surface was mainly composed by Zr and O. Those crystals can be related with the tetragonal phase of YVO4, which they were commonly found by other researchers in studies of hot corrosion of YSZ-based TBCs when its surface reacts with the corrosive salts.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/786/1/012018