Degradation of plasma-sprayed yttria-stabilized zirconia coatings via ingress of vanadium oxide

Chen, Zun; Mabon, Jim; Wen, Jianguo; Trice, Rodney W.

doi:10.1016/j.jeurceramsoc.2008.10.003

Cited by 63 publications

(24 citation statements)

References 27 publications

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“…It is noted in the accompanying paper 22 that two different microstructures develop in V 2 O 5 corroded YSZ coatings; highlights of this paper are provided here. Upon contacting the vanadium-containing melt, the microstructure of the coating undergoes a large-scale change due to a dissolution-precipitation reaction, where the lamellae in the coating are dissolved by the liquid V 2 O 5 , and precipitate out as clusters of sub-micron equiaxed particles.…”

Section: Microstructural Observation Of the Interaction Between V 2 Omentioning

confidence: 84%

“…Near the surface where the V 2 O 5 melt is abundant, the transformation of lamellae to particles is complete. This fully reacted region appears as a porous layer of loosely connected or friable particles, which is designated as a planar reaction zone or PRZ 22 . Below the PRZ is a region deemed the melt infiltrated reaction zone or the MIRZ.…”

Section: Microstructural Observation Of the Interaction Between V 2 Omentioning

confidence: 99%

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Investigation of reactions between vanadium oxide and plasma-sprayed yttria-stabilized zirconia coatings

Chen

Speakman

Howe

et al. 2009

Journal of the European Ceramic Society

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Section: Microstructural Observation Of the Interaction Between V 2 Omentioning

confidence: 84%

Section: Microstructural Observation Of the Interaction Between V 2 Omentioning

confidence: 99%

Investigation of reactions between vanadium oxide and plasma-sprayed yttria-stabilized zirconia coatings

Chen

Speakman

Howe

et al. 2009

Journal of the European Ceramic Society

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“…This leaching out of yttria destabilizes YSZ and accentuates failure of TBCs. Molten salts (especially chlorides) lead to the formation of voluminous non-protective oxides on the bond coat surface resulting in failure of TBCs by delamination at the bond coat/top coat interface [4,5,[16][17][18][19][20][26][27].…”

Section: Spps Tbcs Offer (A) Higher Thermal Cycling Durability Than Amentioning

confidence: 99%

Hot corrosion behavior of solution precursor and atmospheric plasma sprayed thermal barrier coatings

et al. 2015

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“…Pure Na2SO4 does not directly react with YSZ layer in a TBC although its infiltration into pores and cracks may eventually cause thermo-mechanical damage [46]. There has been considerable research on the corrosion behavior in thermal barrier coatings either in the presence of Na2SO4 and V2O5 or only V2O5 [19,[47][48][49][50][51][52][53][54]. The tests reported in the literature have been conducted from 700 o C to about 1050 o C using different salt concentrations, with a majority of the tests focused on YSZ thermal barrier coatings.…”

Section: Hot Corrosion Tests -Failure Mechanismsmentioning

confidence: 99%

Failure mechanisms in APS and SPS thermal barrier coatings during cyclic oxidation and hot corrosion

Jonnalagadda¹

2017

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Linköping 2017Front page image: The top view of yttria stabilized zirconia thermal barrier coating after exposure to a salt mixture of vanadium pentoxide and sodium sulfate at 900 o C.During the course of research underlying this thesis, Krishna Praveen Jonnalagadda was enrolled in Agora Materiae, a multidisciplinary doctoral program at Linköping University, Sweden.ISBN: 978-91-7685-594-2 ISSN: 0280-7971Printed by LiU-Tryck 2017 iii AbstractThermal Barrier Coatings (TBCs) are advanced material systems that are being used in the hot sections of gas turbines such as combustor, turbine blades, and vanes. The top ceramic coating in TBCs provides insulation against the hot gases and the intermediate metallic bond coat provides oxidation and corrosion resistance to the underlying turbine components.Durability of thermal barrier coatings is very important for the overall performance of the gas turbine. TBCs can fail in several different ways and there is a combination of more than one failure mechanism in most situations. One of the most widely used TBC is atmospheric plasma sprayed (APS) yttria stabilized zirconia (YSZ). Both the deposition technique and the TBC material have certain limitations. The main aim of this research is to study new TBC materials and/or new deposition techniques and compare with the conventional YSZ and understand their failure mechanisms during cyclic oxidation and hot corrosion.Thermal cyclic oxidation of a newly developed high purity nano YSZ thermal barrier coating has been studied. Cross sectional analysis of exposed as well as completely failed samples showed a mixed-type failure caused by crack propagation parallel to the bond coat/top coat interface. The majority of the damage occurred towards the end of the coating life. A finite element model has been developed to study the probability of crack growth along different paths that leads to the final failure.Hot corrosion mechanism in suspension plasma sprayed two-layer gadolinium zirconate/YSZ, three-layer dense gadolinium zirconate/gadolinium zirconate/YSZ, and a single-layer YSZ has been studied in the presence of sodium sulfate and vanadium pentoxide. The test results showed that gadolinium zirconate coatings were more susceptible to corrosion compared to YSZ coatings despite gadolinium zirconate coatings having lower reactivity with the corrosive salts.Thermal cycling behavior of a high chromium bond coat has been studied. Cross-sectional analysis showed formation of sandwich type microstructure with chromium rich oxide and alumina as the top and the bottom layers.Inter-diffusion of minor elements between different MCrAlY coatings -substrate systems has been studied using, diffusion simulation software, DICTRA. The simulation results showed that the diffusion of minor elements in the coatings is dependent on the rate of β phase depletion in the beginning. After the depletion of β phase there was no clear dependence of the coating composition on the diffusion of minor elements.v SammanfattningTermiska barriärskikt, eller TBC från...

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Degradation of plasma-sprayed yttria-stabilized zirconia coatings via ingress of vanadium oxide

Cited by 63 publications

References 27 publications

Investigation of reactions between vanadium oxide and plasma-sprayed yttria-stabilized zirconia coatings

Investigation of reactions between vanadium oxide and plasma-sprayed yttria-stabilized zirconia coatings

Hot corrosion behavior of solution precursor and atmospheric plasma sprayed thermal barrier coatings

Failure mechanisms in APS and SPS thermal barrier coatings during cyclic oxidation and hot corrosion

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