Na2SO4 and V2O5 molten salts corrosion resistance of plasma-sprayed nanostructured ceria and yttria co-stabilized zirconia thermal barrier coatings

Morteza Hajizadeh-Oghaz; Reza Shoja Razavi; Ali Ghasemi; Zia Valefi

doi:10.1016/j.ceramint.2015.12.085

Na₂SO₄ and V₂O₅ molten salts corrosion resistance of plasma-sprayed nanostructured ceria and yttria co-stabilized zirconia thermal barrier coatings

Morteza Hajizadeh-Oghaz
, Reza Shoja Razavi
, Ali Ghasemi
, Zia Valefi

Research output: Journal Publication › Article › peer-review

52 Citations (Scopus)

Abstract

The hot corrosion behavior of plasma-sprayed ceria-yttria co-stabilized zirconia (CYSZ) nanostructured coatings (with the chemical composition of ZrO₂-2.5 wt%Y₂O₃-25 wt%CeO₂) was studied in the presence of 45 wt% Na₂SO₄+55 wt%V₂O₅ as the corrosive molten salts, for 6, 12, 18, 30, 72, 156, and 300 h at 1000 °C. As the hot corrosion products, YVO₄, CeVO₄ and Ce_0.75O₂Zr_0.25 crystals were formed by leaching Y₂O₃ and CeO₂ from CYSZ due to the reaction between the corrosive salts and (Y₂O₃, CeO₂) stabilizers of zirconia. The CYSZ nanostructured coating showed remarkable resistance to degradation throughout the hot corrosion test, irrespective of an additional reaction with the corrosive salts. A mechanism was suggested based on the prohibition of the further diffusion of molten salts into the deeper layers of the coating, via diffusional resistance in the nanoporous media.

Original language	English
Pages (from-to)	5433-5446
Number of pages	14
Journal	Ceramics International
Volume	42
Issue number	4
DOIs	https://doi.org/10.1016/j.ceramint.2015.12.085
Publication status	Published - 1 Mar 2016
Externally published	Yes

Free Keywords

Ceria-yttria co-stabilized zirconia
Hot corrosion
Nanostructure
Thermal barrier coatings

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/j.ceramint.2015.12.085

Cite this

@article{2e7a7a087b614d83ae4a4382a5694749,

title = "Na2SO4 and V2O5 molten salts corrosion resistance of plasma-sprayed nanostructured ceria and yttria co-stabilized zirconia thermal barrier coatings",

abstract = "The hot corrosion behavior of plasma-sprayed ceria-yttria co-stabilized zirconia (CYSZ) nanostructured coatings (with the chemical composition of ZrO2-2.5 wt\%Y2O3-25 wt\%CeO2) was studied in the presence of 45 wt\% Na2SO4+55 wt\%V2O5 as the corrosive molten salts, for 6, 12, 18, 30, 72, 156, and 300 h at 1000 °C. As the hot corrosion products, YVO4, CeVO4 and Ce0.75O2Zr0.25 crystals were formed by leaching Y2O3 and CeO2 from CYSZ due to the reaction between the corrosive salts and (Y2O3, CeO2) stabilizers of zirconia. The CYSZ nanostructured coating showed remarkable resistance to degradation throughout the hot corrosion test, irrespective of an additional reaction with the corrosive salts. A mechanism was suggested based on the prohibition of the further diffusion of molten salts into the deeper layers of the coating, via diffusional resistance in the nanoporous media.",

keywords = "Ceria-yttria co-stabilized zirconia, Hot corrosion, Nanostructure, Thermal barrier coatings",

author = "Morteza Hajizadeh-Oghaz and Razavi, \{Reza Shoja\} and Ali Ghasemi and Zia Valefi",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd and Techna Group S.r.l.",

year = "2016",

month = mar,

day = "1",

doi = "10.1016/j.ceramint.2015.12.085",

language = "English",

volume = "42",

pages = "5433--5446",

journal = "Ceramics International",

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TY - JOUR

T1 - Na2SO4 and V2O5 molten salts corrosion resistance of plasma-sprayed nanostructured ceria and yttria co-stabilized zirconia thermal barrier coatings

AU - Hajizadeh-Oghaz, Morteza

AU - Razavi, Reza Shoja

AU - Ghasemi, Ali

AU - Valefi, Zia

PY - 2016/3/1

Y1 - 2016/3/1

N2 - The hot corrosion behavior of plasma-sprayed ceria-yttria co-stabilized zirconia (CYSZ) nanostructured coatings (with the chemical composition of ZrO2-2.5 wt%Y2O3-25 wt%CeO2) was studied in the presence of 45 wt% Na2SO4+55 wt%V2O5 as the corrosive molten salts, for 6, 12, 18, 30, 72, 156, and 300 h at 1000 °C. As the hot corrosion products, YVO4, CeVO4 and Ce0.75O2Zr0.25 crystals were formed by leaching Y2O3 and CeO2 from CYSZ due to the reaction between the corrosive salts and (Y2O3, CeO2) stabilizers of zirconia. The CYSZ nanostructured coating showed remarkable resistance to degradation throughout the hot corrosion test, irrespective of an additional reaction with the corrosive salts. A mechanism was suggested based on the prohibition of the further diffusion of molten salts into the deeper layers of the coating, via diffusional resistance in the nanoporous media.

AB - The hot corrosion behavior of plasma-sprayed ceria-yttria co-stabilized zirconia (CYSZ) nanostructured coatings (with the chemical composition of ZrO2-2.5 wt%Y2O3-25 wt%CeO2) was studied in the presence of 45 wt% Na2SO4+55 wt%V2O5 as the corrosive molten salts, for 6, 12, 18, 30, 72, 156, and 300 h at 1000 °C. As the hot corrosion products, YVO4, CeVO4 and Ce0.75O2Zr0.25 crystals were formed by leaching Y2O3 and CeO2 from CYSZ due to the reaction between the corrosive salts and (Y2O3, CeO2) stabilizers of zirconia. The CYSZ nanostructured coating showed remarkable resistance to degradation throughout the hot corrosion test, irrespective of an additional reaction with the corrosive salts. A mechanism was suggested based on the prohibition of the further diffusion of molten salts into the deeper layers of the coating, via diffusional resistance in the nanoporous media.

KW - Ceria-yttria co-stabilized zirconia

KW - Hot corrosion

KW - Nanostructure

KW - Thermal barrier coatings

UR - https://www.scopus.com/pages/publications/84955690885

U2 - 10.1016/j.ceramint.2015.12.085

DO - 10.1016/j.ceramint.2015.12.085

M3 - Article

AN - SCOPUS:84955690885

SN - 0272-8842

VL - 42

SP - 5433

EP - 5446

JO - Ceramics International

JF - Ceramics International

IS - 4

ER -