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

Liu, Hui; Cai, Jin; Zhu, Jihong

doi:10.3390/coatings9060351

Open AccessArticle

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

by

Hui Liu

^1,*,

Jin Cai

² and

Jihong Zhu

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

Submission 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)

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Abstract

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.

Keywords: thermal barrier coating (TBC); BaLa₂Ti₃O₁₀; molten salt corrosion; corrosion mechanisms

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MDPI and ACS Style

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. https://doi.org/10.3390/coatings9060351

AMA Style

Liu H, Cai J, Zhu J. Hot Corrosion Behavior of BaLa₂Ti₃O₁₀ Thermal Barrier Ceramics in V₂O₅ and Na₂SO₄ + V₂O₅ Molten Salts. Coatings. 2019; 9(6):351. https://doi.org/10.3390/coatings9060351

Chicago/Turabian Style

Liu, Hui, Jin Cai, and Jihong Zhu. 2019. "Hot Corrosion Behavior of BaLa₂Ti₃O₁₀ Thermal Barrier Ceramics in V₂O₅ and Na₂SO₄ + V₂O₅ Molten Salts" Coatings 9, no. 6: 351. https://doi.org/10.3390/coatings9060351

APA Style

Liu, H., Cai, J., & Zhu, J. (2019). Hot Corrosion Behavior of BaLa₂Ti₃O₁₀ Thermal Barrier Ceramics in V₂O₅ and Na₂SO₄ + V₂O₅ Molten Salts. Coatings, 9(6), 351. https://doi.org/10.3390/coatings9060351

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

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