Our website is currently undergoing maintenance. Article records and full texts remain available. Submissions can be made through the Editorial Manager.

Factors Affecting the Performance of Thermal Barrier Coatings in the Presence of V₂O₅ and Na₂SO₄

K.P. Jonnalagadda, R. Eriksson, R.L. Peng, X.-H. Li, S. Johansson

Journal of Ceramic Science and Technology, Vol. 7, No. 4 (2016), pp. 409-416

DOI: 10.4416/JCST2016-00058

Download full article (PDF)

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.

Keywords

HOSP, agglomerated and sintered YSZ, hot corrosion, TBC

View this issue · Article & DOI index