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Open AccessArticle

Hot Corrosion Behavior of BaLa2Ti3O10 Thermal Barrier Ceramics in V2O5 and Na2SO4 + V2O5 Molten Salts

1
School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
2
College of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(6), 351; https://doi.org/10.3390/coatings9060351
Received: 12 March 2019 / Revised: 8 April 2019 / Accepted: 10 April 2019 / Published: 29 May 2019
(This article belongs to the Special Issue Science and Technology of Thermal Barrier Coatings)
BaLa2Ti3O10 ceramics for thermal barrier coating (TBC) applications were fabricated, and exposed to V2O5 and Na2SO4 + V2O5 molten salts at 900 °C to investigate the hot corrosion behavior. After 4 h corrosion tests, the main reaction products resulting from V2O5 salt corrosion were LaVO4, TiO2, and Ba3V4O13, whereas those due to Na2SO4 + V2O5 corrosion consisted of LaVO4, TiO2, BaSO4 and some Ba3V4O13. The structures of reaction layers on the surfaces depended on the corrosion medium. In V2O5 salt, the layer was dense and had a thickness of 8–10 μm. While in Na2SO4 + V2O5 salt, it had a ~15 μm porous structure and a dense, thin band at the bottom. Beneath the dense layer or the band, no obvious molten salt was found. The mechanisms by which the reaction layer forms were discussed. View Full-Text
Keywords: thermal barrier coating (TBC); BaLa2Ti3O10; molten salt corrosion; corrosion mechanisms thermal barrier coating (TBC); BaLa2Ti3O10; molten salt corrosion; corrosion mechanisms
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Liu, H.; Cai, J.; Zhu, J. Hot Corrosion Behavior of BaLa2Ti3O10 Thermal Barrier Ceramics in V2O5 and Na2SO4 + V2O5 Molten Salts. Coatings 2019, 9, 351.

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