Nanostructured YSZ thermal barrier coatings engineered to counteract sintering effects

Lima, Rogerio S.; Marple, Basil R.

doi:10.1016/j.msea.2007.07.082

Cited by 217 publications

(106 citation statements)

References 27 publications

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“…It was found that with the use of nano sized powders, improvement in thermal shock resistance can be obtained due to the lower tensile stress in plane and higher fracture toughness of nanostructured layers [30][31][32]. However, feeding of powders below 10µm into a plasma jet is considered near impossible and agglomerated nano powders retain only a little of their original structure in the final coating [33][34].…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity and thermal cyclic fatigue of multilayered Gd2Zr2O7/YSZ thermal barrier coatings processed by suspension plasma spray

Mahade

Curry

Björklund

et al. 2015

Surface and Coatings Technology

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Section: Introductionmentioning

confidence: 99%

Thermal conductivity and thermal cyclic fatigue of multilayered Gd2Zr2O7/YSZ thermal barrier coatings processed by suspension plasma spray

Mahade

Curry

Björklund

et al. 2015

Surface and Coatings Technology

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“…Some example of nanostructured ceramic coatings obtained by APS from agglomerated powders include alumina [16,17], titania [18,19], alumina-titania [14,20], yttria-stabilised zirconia [21,22] or pyrochlore [23].…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO 2 addition on the microstructure and nanomechanical properties of Al 2 O 3 Suspension Plasma Sprayed coatings

Bannier

Vicent

Rayón

et al. 2014

Applied Surface Science

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Versión / Versió:Preprint were used as starting materials. The coatings microstructure and phase composition were fully characterised using FEG-SEM and XRD techniques. Nanoindentation technique was used to determine the coatings hardness and elastic modulus properties.Results have shown that the addition of titania to alumina SPS coatings causes different crystalline phases and a higher powder melting rate is reached. The higher melted material achieved, when titania is added leads to higher hardness and elastic modulus when the same spraying parameters are used.

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“…Nano-YSZ coatings exhibit a bimodal feature consisting of a structure formed by the re-solidification of the agglomerates, that were fully melted in the spray jet, and zones from the incorporation of the semi-molten material [14]. Published research about nano-YSZ shows that these coatings exhibit better life during both thermal shock and thermal cycling tests compared to the conventional YSZ coatings [15][16][17][18].…”

Section: Top Coatmentioning

confidence: 99%

“…Published research about nano-YSZ shows that these coatings exhibit better life during both thermal shock and thermal cycling tests compared to the conventional YSZ coatings [15][16][17][18]. Work by Lima and Marple shows that nano-YSZ coatings have better sintering resistance compared to the conventional YSZ coatings [14]. These coatings also exhibit corrosion resistance superior to the conventional YSZ in the presence of V2O5 and Na2SO4 [19].…”

Section: Top Coatmentioning

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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Nanostructured YSZ thermal barrier coatings engineered to counteract sintering effects

Cited by 217 publications

References 27 publications

Thermal conductivity and thermal cyclic fatigue of multilayered Gd2Zr2O7/YSZ thermal barrier coatings processed by suspension plasma spray

Thermal conductivity and thermal cyclic fatigue of multilayered Gd2Zr2O7/YSZ thermal barrier coatings processed by suspension plasma spray

Effect of TiO 2 addition on the microstructure and nanomechanical properties of Al 2 O 3 Suspension Plasma Sprayed coatings

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

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