Thermal-barrier coatings for more efficient gas-turbine engines

Clarke, David R.; Oechsner, Matthias; Padture, Nitin P.

doi:10.1557/mrs.2012.232

Cited by 1,217 publications

(577 citation statements)

References 49 publications

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“…Thermal barrier coatings (TBCs) have been widely employed to protect the hotsection components of gas turbines and accommodate the increase of turbine inlet temperature, resulting in the improvement of the generation efficiency [1][2][3][4]. Most of TBC systems are consisted of a superalloy substrate, an adhesive metallic bond coat, and a thermal insulating ceramic top coat.…”

Section: Introductionmentioning

confidence: 99%

Microstructure design for blended feedstock and its thermal durability in lanthanum zirconate based thermal barrier coatings

Song

Paik

Guo

et al. 2016

Surface and Coatings Technology

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The effects of microstructure design on the lifetime performance of lanthanum zirconate (La2Zr2O7; LZO) based thermal barrier coatings (TBCs) were investigated through various thermal exposure tests, such as furnace cyclic thermal fatigue, thermal shock, and jet engine thermal shock. To improve the thermal durability of LZO-based TBCs, composite top coats using two feedstock powders of LZO and 8 wt.% yttria doped stabilized zirconia (8YSZ) were prepared by mixing at different volume ratios (50:50 and 25:75, respectively). Also, buffer layers were introduced in layered LZO-based TBCs deposited by air plasma spray method. The TBCs with two buffer layers showed the best thermal shock resistance and thermal cyclic performance among all samples in all tests. For applications with mildly slow cooling rates, the thermal durability in single-layer TBCs is more effectively enhanced by controlling composite ratio in the blended powder, better than introducing a single buffer layer. For applications with fast cooling rates, the thermal durability can be effectively improved by introducing buffer layer than composite top coat, since buffer layer provides fast localized stress relief due to its high strain compliance. These research findings allow us to control the TBC structure and the buffer layer is efficient in improving thermal durability in the cyclic thermal exposure and thermal shock environments.

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Section: Introductionmentioning

confidence: 99%

Microstructure design for blended feedstock and its thermal durability in lanthanum zirconate based thermal barrier coatings

Song

Paik

Guo

et al. 2016

Surface and Coatings Technology

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“…Os dois primeiros itens são extensivamente tratados na literatura, mas o menos discutido ou conhecido é o desenvolvimento dos Revestimentos para Barreira Térmica, mesmo considerando que seu uso na última década permitiu um aumento muito grande nas temperaturas das turbinas, muito maior que a possibilitada pelas mudanças na tecnologia de solidificação direcional e técnicas de obtenção de ligas de monocristal dos últimos 30 anos [7,8,9].…”

Section: Melhoramentos Tecnológicos Do Sistemaunclassified

“…Depois de alguns anos, foram aplicados os primeiros revestimentos do tipo MCrAlY, onde M se refere a Ni, Co ou Fe. Só bem posteriormente foram introduzidos os TBCs, revestimentos cerâmicos [9]. Existem, na atualidade, dezenas de patentes com variações do material MCrAlY original, largamente aplicados em revestimentos de engenharia na indústria aeroespacial e de turbinas de energia [4,10].…”

Section: Revestimentos Cerâmicosunclassified

“…Este tipo de revestimento tinha como limitação a baixa vida útil devido à oxidação acelerada da camada de ligação. Melhores resultados foram obtidos para revestimentos cerâmicos de zircônia parcialmente estabilizada com 8% (em peso) de ítria, aplicado por aspersão térmica sobre uma camada de ligação de MCrAlY [9]. Mais recentemente, no início da década de 1980, os revestimentos cerâmicos à base de ZrO 2 aplicados por deposição física de vapor (PVD) sobre uma camada de MCrAlY promoveram maior durabilidade, suficiente para serem usados em partes móveis de turbinas [6,9].…”

Section: Revestimentos Cerâmicosunclassified

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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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“…With regard to processing, atmospheric plasma spraying (APS) is one of the most common techniques to produce these coatings due to its good balance between coating performance and low cost [2]. However in the last years the need of increasing the operational temperature of gas turbines has fueled an intense research activity to develop coatings systems with enhanced thermal insulation, in particular low thermal conductivity [3,4]. In this sense, in previous research it has been demonstrated that using fine (nano-or submicronstructured) instead of coarse (microstructured) powder as plasma feedstock gives rise to coatings with lower thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Double-Layer and Graded Composite Coatings of YSZ Obtained by Atmospheric Plasma Spraying

et al. 2016

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Double-layer and graded composite coatings of yttria stabilised zirconia (YSZ) were sprayed on metallic substrates by atmospheric plasma spray (APS). The coatings architecture was built up by combining two different feedstocks: one micro-and one nano-structured. Microstructural features and mechanical properties (hardness and elastic modulus) of the coatings were determined by FE-SEM microscopy and nanoindentation technique respectively. Additional adherence and scratch tests were carried out in order to assess the failure mechanisms occurring between the layers comprising the composites.Microstructural inspection of the coatings confirms the two-zones microstructure. This bi-modal microstructure which is exclusive of the layer obtained from the nano-structured feedstock negatively affects the mechanical properties of the whole composite. Nanoindentation tests suitably reproduce the evolution of mechanical properties through coatings thickness on the basis of the position and/or amount of nano-structured feedstock used in the depositing layer.Adhesion and scratch tests show the negative effect on the coating adhesion of layer obtained from the nano-structured feedstock when this layer is deposited on the bond coat. Thus the poor integrity of this layer results in lower normal stresses required to delaminate the coating in the adhesion test as well as minor critical load registered by using the scratch test.

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Thermal-barrier coatings for more efficient gas-turbine engines

Cited by 1,217 publications

References 49 publications

Microstructure design for blended feedstock and its thermal durability in lanthanum zirconate based thermal barrier coatings

Microstructure design for blended feedstock and its thermal durability in lanthanum zirconate based thermal barrier coatings

Revestimentos para barreira térmica: evolução e perspectivas

Mechanical Properties of Double-Layer and Graded Composite Coatings of YSZ Obtained by Atmospheric Plasma Spraying

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