Processing science of advanced thermal-barrier systems

Sampath, Sanjay; Schulz, Uwe; Jarligo, Maria Ophelia; Katayama, Seiji

doi:10.1557/mrs.2012.233

Cited by 251 publications

(107 citation statements)

References 32 publications

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“…Some cracks in the splat borders and porosity were retained between the splats. Few vertical cracks were also observed, attributing this behaviour to the fast cooling of the molten splat [3,4]. The YSZ monolayer coating exhibited a similar porosity as that of Gd2Zr2O7 when using the same plasma spraying parameters ( Fig.…”

Section: As-sprayed Coatingsmentioning

confidence: 80%

“…Besides, a thermally-grown oxide (TGO) layer of Al2O3 appears between the bond coat and the ceramic layer during the TBC lifespan due to a selective oxidation of the bond coat [1,2]. One of the most used techniques to obtain the TBC is the atmospheric plasma spraying (APS) owing to its easy industrial-scaling, in addition to the resultant coating microstructure that brings on a thermal conductivity reduction [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Thermal behaviour of multilayer and functionally-graded YSZ/Gd2Zr2O7 coatings

Carpio

Salvador

Borrell

et al. 2017

Ceramics International

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Zirconates with pyrochlore structure, such as Gd2Zr2O7, are new promising thermal barrier coatings because of their very low thermal conductivity and good chemical resistance against molten salts. However, their coefficient of thermal expansion is low, therefore their thermal fatigue resistance is compromised. As a solution, the combination of yttria-stabilised zirconia (YSZ) and Gd2Zr2O7 can reduce the thermal contraction mismatch between the thermal barrier coating parts.In the present study, two possible designs have been performed to combine YSZ/ Gd2Zr2O7. On the one hand, a multilayer coating was obtained where YSZ layer was deposited between a Gd2Zr2O7 layer and a bond coat. On the other hand, a functionallygraded coating was designed where different layers with variable ratios of YSZ/Gd2Zr2O7 were deposited such that the composition gradually changed along the coating thickness.Multilayer and functionally-graded coatings underwent isothermal and thermally-cycled treatments in order to evaluate the oxidation, sintering effects and thermal fatigue resistance of the coatings. The YSZ/Gd2Zr2O7 multilayer coating displayed better thermal behaviour than the Gd2Zr2O7 monolayer coating but quite less thermal fatigue resistance compared to the conventional YSZ coating. However, the functionally-graded coating displays a good thermal fatigue resistance. Hence, it can be concluded that this kind of design is ideal to optimise the behaviour of thermal barrier coatings.

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Section: As-sprayed Coatingsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Thermal behaviour of multilayer and functionally-graded YSZ/Gd2Zr2O7 coatings

Carpio

Salvador

Borrell

et al. 2017

Ceramics International

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“…One such example is the suspension or solution precursor plasma spray (SPS or SPPS) process which has been used to create TBCs with novel microstructures exhibiting columnar structures similar to that of EB-PVD-deposited TBCs (Ref [17][18][19]. The SPS process can be an economical alternative to EB-PVD for TBC deposition where relatively thin TBCs (~250 lm thick) are needed.…”

Section: Developments In Coating Equipmentmentioning

confidence: 99%

Advances in Thermal Spray Coatings for Gas Turbines and Energy Generation: A Review

Hardwicke¹,

Lau²

2013

J Therm Spray Tech

236

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Functional coatings are widely used in energy generation equipment in industries such as renewables, oil and gas, propulsion engines, and gas turbines. Intelligent thermal spray processing is vital in many of these areas for efficient manufacturing. Advanced thermal spray coating applications include thermal management, wear, oxidation, corrosion resistance, sealing systems, vibration and sound absorbance, and component repair. This paper reviews the current status of materials, equipment, processing, and propertiesÕ aspects for key coatings in the energy industry, especially the developments in large-scale gas turbines. In addition to the most recent industrial advances in thermal spray technologies, future technical needs are also highlighted.

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“…Cada pequeno avanço é significativo, não existindo situação definitiva. Na medida em que novos materiais são propostos para as camadas cerâmicas e metálicas de TBC's [17,78], em conjunção com a evolução dos processos de aplicação [79] e sistemas de controle e monitoramento [80], abrem-se as portas para novos projetos de pesquisa, em diversos aspectos deste mesmo tema.…”

Section: Outros Fatores De Melhoria De Desempenhounclassified

Revestimentos para barreira térmica: evolução e perspectivas

Lima

2014

Soldag. insp.

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Resumo Palavras-chave: Revestimento para barreira térmica; TBC; Aspersão térmica; Metal-cerâmica. Abstract: For over four decades, thermal barrier coatings, or simply TBC, have been decisive for the performance of gas turbines in aviation and aerospace, and more recently also in the performance of power generation turbines and diesel engines. Its importance overlaps the developments achieved in the area

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Processing science of advanced thermal-barrier systems

Abstract: Abstract

Cited by 251 publications

References 32 publications

Thermal behaviour of multilayer and functionally-graded YSZ/Gd2Zr2O7 coatings

Thermal behaviour of multilayer and functionally-graded YSZ/Gd2Zr2O7 coatings

Advances in Thermal Spray Coatings for Gas Turbines and Energy Generation: A Review

Revestimentos para barreira térmica: evolução e perspectivas

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