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Factors Affecting the Performance of Thermal Barrier Coatings in the Presence of V2O5 and Na2SO4
K.P. Jonnalagadda1, R. Eriksson1, R.L. Peng1, X.-H. Li2, S. Johansson1
1 IEI, Linköping University, 58183 Linköping, Sweden
2 Siemens Industrial Turbomachinery AB, SE-61283 Finspång, Sweden
received August 12, 2016, received in revised form November 10, 2016, accepted November 21, 2016
Vol. 7, No. 4, Pages 409-416 DOI: 10.4416/JCST2016-00058
Abstract
This study investigates the influence of temperature, salt concentration and thickness on the corrosion resistance of seven YSZ thermal barrier coatings in the presence of V2O5 and Na2SO4. For this study, a thick, high-porosity APS coating (670 µm) using hollow spherical powder (HOSP) and a thin, low-porosity APS coating (300 µm) using agglomerated and sintered (A&S) powder were fabricated. Corrosion tests were conducted at 750 °C and 900 °C with a mixture of Na2SO4 and V2O5 for four hours. At each temperature, salt concentrations of 4, 10 and 20 mg/cm2 were used. SEM and XRD investigations after the corrosion tests revealed that a combination of low temperature and high salt concentration resulted in higher corrosion-induced damage to the thin TBC coatings. With regard to the thick TBC coatings, all except one sample failed during the corrosion test. This suggests that thick TBC coatings with higher porosity may not be suitable in corrosive environments.
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Keywords
HOSP, agglomerated and sintered YSZ, hot corrosion, TBC
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