Hot corrosion behaviour of atmospheric and solution precursor plasma sprayed (La0.9Gd0.1)2Ce2O7 coatings in sulfate and vanadate environments

K. Praveen; N. Sravani; Rahul Jude Alroy; G. Shanmugavelayutham; G. Sivakumar

doi:10.1016/j.jeurceramsoc.2019.05.061

Hot corrosion behaviour of atmospheric and solution precursor plasma sprayed (La_0.9Gd_0.1)₂Ce₂O₇ coatings in sulfate and vanadate environments

K. Praveen
, N. Sravani
, Rahul Jude Alroy
, G. Shanmugavelayutham
, G. Sivakumar^*

^*Corresponding author for this work

Not published at VTT

Research output: Contribution to journal › Article › Scientific › peer-review

19 Citations (Scopus)

Abstract

Conventional and solution precursor plasma spraying (SPPS) techniques were employed for developing gadolinium oxide doped lanthanum cerate ((La_0.9Gd_0.1)₂Ce₂O₇, Gd-LC) based double-layered thermal barrier coatings (TBCs). Hot corrosion studies of the above coatings were carried out in molten Na₂SO₄ + V₂O₅ (1:1) environment at 900 °C. The state-of-the-art yttria-stabilized-zirconia (YSZ) coating was found to be completely delaminated after 120 h by forming yttrium vanadate (YVO₄) and m-ZrO₂. The accelerated delamination of YSZ can be attributed to the undesired phase transformation during exposure to corrosive species. Double-layered APS coatings were found to last for more than 300 h without densification of underlying YSZ layer and also, show better adherence with bond coat. SPPS Gd-LC coatings were found to be completely delaminated on densifying the underlying YSZ within 300 h. Lanthanum vanadate (LaVO₄) was found to be the main corrosive product along with minor amounts of gadolinium vanadate (GdVO₄) in Gd-LC double-layer coatings.

Original language	English
Pages (from-to)	4233-4244
Journal	Journal of the European Ceramic Society
Volume	39
Issue number	14
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2019.05.061
Publication status	Published - Nov 2019
MoE publication type	A1 Journal article-refereed

Funding

K. Praveen, acknowledges University Grants Commission (UGC) for proving fellowship under Basic Scientific Research scheme (BSR) (F25-1/2013-14(BSR)7-307/2010/(BSR)) to carry out this work. The authors would like to thank the Director, ARCI for his kind permission to publish this work. The support extended by Mr A Sathyanarayana, Mr GVR Reddy, and Mr K Ramesh Reddy during experimental studies and characterization are gratefully acknowledged.

Keywords

Gadolinium oxide doped lanthanum cerate
Hot corrosion
m-ZrO
Solution precursor plasma spraying
YVO

Access to Document

10.1016/j.jeurceramsoc.2019.05.061

Cite this

@article{371069e8743c40ecbf347c0760e90dcd,

title = "Hot corrosion behaviour of atmospheric and solution precursor plasma sprayed (La0.9Gd0.1)2Ce2O7 coatings in sulfate and vanadate environments",

abstract = "Conventional and solution precursor plasma spraying (SPPS) techniques were employed for developing gadolinium oxide doped lanthanum cerate ((La0.9Gd0.1)2Ce2O7, Gd-LC) based double-layered thermal barrier coatings (TBCs). Hot corrosion studies of the above coatings were carried out in molten Na2SO4 + V2O5 (1:1) environment at 900 °C. The state-of-the-art yttria-stabilized-zirconia (YSZ) coating was found to be completely delaminated after 120 h by forming yttrium vanadate (YVO4) and m-ZrO2. The accelerated delamination of YSZ can be attributed to the undesired phase transformation during exposure to corrosive species. Double-layered APS coatings were found to last for more than 300 h without densification of underlying YSZ layer and also, show better adherence with bond coat. SPPS Gd-LC coatings were found to be completely delaminated on densifying the underlying YSZ within 300 h. Lanthanum vanadate (LaVO4) was found to be the main corrosive product along with minor amounts of gadolinium vanadate (GdVO4) in Gd-LC double-layer coatings.",

keywords = "Gadolinium oxide doped lanthanum cerate, Hot corrosion, m-ZrO, Solution precursor plasma spraying, YVO",

author = "K. Praveen and N. Sravani and Alroy, \{Rahul Jude\} and G. Shanmugavelayutham and G. Sivakumar",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

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AU - Praveen, K.

AU - Sravani, N.

AU - Alroy, Rahul Jude

AU - Shanmugavelayutham, G.

AU - Sivakumar, G.

PY - 2019/11

Y1 - 2019/11

N2 - Conventional and solution precursor plasma spraying (SPPS) techniques were employed for developing gadolinium oxide doped lanthanum cerate ((La0.9Gd0.1)2Ce2O7, Gd-LC) based double-layered thermal barrier coatings (TBCs). Hot corrosion studies of the above coatings were carried out in molten Na2SO4 + V2O5 (1:1) environment at 900 °C. The state-of-the-art yttria-stabilized-zirconia (YSZ) coating was found to be completely delaminated after 120 h by forming yttrium vanadate (YVO4) and m-ZrO2. The accelerated delamination of YSZ can be attributed to the undesired phase transformation during exposure to corrosive species. Double-layered APS coatings were found to last for more than 300 h without densification of underlying YSZ layer and also, show better adherence with bond coat. SPPS Gd-LC coatings were found to be completely delaminated on densifying the underlying YSZ within 300 h. Lanthanum vanadate (LaVO4) was found to be the main corrosive product along with minor amounts of gadolinium vanadate (GdVO4) in Gd-LC double-layer coatings.

AB - Conventional and solution precursor plasma spraying (SPPS) techniques were employed for developing gadolinium oxide doped lanthanum cerate ((La0.9Gd0.1)2Ce2O7, Gd-LC) based double-layered thermal barrier coatings (TBCs). Hot corrosion studies of the above coatings were carried out in molten Na2SO4 + V2O5 (1:1) environment at 900 °C. The state-of-the-art yttria-stabilized-zirconia (YSZ) coating was found to be completely delaminated after 120 h by forming yttrium vanadate (YVO4) and m-ZrO2. The accelerated delamination of YSZ can be attributed to the undesired phase transformation during exposure to corrosive species. Double-layered APS coatings were found to last for more than 300 h without densification of underlying YSZ layer and also, show better adherence with bond coat. SPPS Gd-LC coatings were found to be completely delaminated on densifying the underlying YSZ within 300 h. Lanthanum vanadate (LaVO4) was found to be the main corrosive product along with minor amounts of gadolinium vanadate (GdVO4) in Gd-LC double-layer coatings.

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