Ceramic Thermal Barrier Coatings for Turbine Engine Components

Duvall, D. S.; Ruckle, D. L.

doi:10.1115/82-gt-322

Cited by 20 publications

(10 citation statements)

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“…Because of this success, much attention has been directed toward the use of thermal barriers on blades and vanes, [69][70][71][72] but only within the last decade have they been used on highly stressed turbine components within commercial gas-turbine engines. 71,72 Figure 13 illustrates the strain-tolerant columnar microstructure that is produced using EB-PVD.…”

Section: Thermal-barrier Coatingsmentioning

confidence: 99%

Designing oxidation-resistant coatings

Nicholls¹

2000

JOM

255

122

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Overview Oxidation ResistanceThis article examines the historical development of high-temperature, oxidation-and corrosion-resistant coatings, demonstrating how diffusion surface treatments, modified diffusion coatings, the design of M-Cr-Al-X corrosion-resistant overlay coatings, and the application of thermal-barrier coatings can be used to reduce the scaling (oxidation) rate of coated components. Future trends in hightemperature coating design are also reviewed, including the custom design of corrosionresistant alloys, smart overlay coating concepts, diffusion barriers, and the use of layered thermal-barrier coating structures. INTRODUCTIONSurface engineering plays an important role in the operation of all hightemperature plants, whether for power generation, chemical processing, or component heat treatment. In its simplest form, the surface engineering of structural alloys results from the growth of a protective oxide, due to the selective oxidation of alloying additions within the alloy. The desire for higher operating temperature; improved performance; extended component lives; and cleaner, more fuel-efficient power plant/processes places severe demands on the structural materials used to construct such a high-temperature plant. As a result, many components operating at high temperature within such plants are coated or surface treated.The use of coatings, or surface treatments, permits the separation (or partial separation) of surface-and substrate-

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Section: Thermal-barrier Coatingsmentioning

confidence: 99%

Designing oxidation-resistant coatings

Nicholls¹

2000

JOM

255

122

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“…gas turbine combustors. Nowadays, as operating temperature of gas turbines are increased, thermal barrier coatings, which consisted of a vacuum plasma sprayed MCrAlY bond coat layer, are developed for air-cooled gas turbine blades and vanes (Duvall et al, 1982;Miller, 1987). In addition to extending the components life, the coating technologies, such as high-temperature protective coatings and thermal barrier coatings, can increase turbine operating temperature.…”

Section: Introductionmentioning

confidence: 99%

Reaction Diffusion Behaviors for Interface Between Ni-Based Super Alloys and Vacuum Plasma Sprayed MCrAlY Coatings

Itoh

Tamura

1999

Journal of Engineering for Gas Turbines and Power

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The object of this study is overlay coatings of MCrAlY alloy sprayed by a vacuum plasma spray (VPS) process for the protection against high-temperature corrosion and oxidation in the field of gas turbine components. Reaction diffusion behaviors at the interface between the MCrAlY coatings and the substrate, which have an important effect on coating degradation, have not always been clarified. Three kinds of substrate, equiaxis 1N738LC, directional solidified CM247LC and single-crystal CMSX-2, and the four kinds of vacuum plasma sprayed MCrAlY coating have been selected for these experiments.The experimental results showed that the reaction diffusion layers consisted of aluminum compound layer and aluminum depleted layer, excepting that the aluminum depleted layer could not be observed in the case of CoNiCrAlY and NiCoCrAlY coatings. It also indicated that the diffusion thickness could be observed to follow a parabolic time dependence.. The order of reaction diffusion rate was NiCrAlY > CoCrAlY > CoNiCrAlY > NiCoCrAlY independent of the substrates. A convenient computer-aided system was developed for analyzing the reaction diffusion behaviors at the interface between coating and substrate. It was also clear that the estimated results of long time diffusion behaviors by simulation analysis was in good agreement with experiments.

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“…In addition, it must be able to retain this property and its low thermal conductivity during prolonged environmental exposure. A porous, columnar, 100-200 μm thick, yttria stabilized zirconia (YSZ) layer is currently preferred for this function [28]. This layer may be applied using either air plasma spray (APS) or electron beam physical vapor deposition 301 (EB-PVD).…”

Section: Thermal Barrier Coatingmentioning

confidence: 99%

Numerical Simulation of the Melting of Particles Injected in a Plasma Jet

Rojas

Cruchaga

Celentano³

et al. 2009

Ingeniare. Rev. chil. ing.

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Este trabajo presenta la simulación numérica de la fusión de una partícula inyectada en un jet de plasma. Este proceso es hoy en día aplicado para producir capas o recubrimientos delgados sobre componentes mecánicos metálicos, con el objetivo de mejorar su resistencia superficial frente a diferentes fenómenos tales como corrosión, temperatura y desgaste. En este trabajo se estudió la transferencia de calor incluyendo cambio de fase, de una partícula bimaterial compuesta por un centro metálico de hierro recubierto por una capa protectora de alúmina cerámica, dentro de un jet de plasma. El modelo numérico tomó en cuenta las condiciones ambientales a lo largo de toda su trayectoria en el jet. La simulación numérica de este problema fue realizada mediante una formulación de elementos finitos con cambio de fase que retiene como variable única la temperatura. Los resultados obtenidos mediante esta metodología describieron satisfactoriamente el proceso de fusión de la partícula. En particular, se describe la evolución del cambio de fase de la partícula bimaterial considerando el efecto producido por su movimiento en el ambiente gaseoso. Además, los resultados numéricos presentan concordancia con los presentados en la literatura utilizando una formulación de volúmenes finitos basada en la entalpía. Palabras clave: Cambio de fase, transferencia de calor, partícula bimaterial, plasma.

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Ceramic Thermal Barrier Coatings for Turbine Engine Components

Cited by 20 publications

References 0 publications

Designing oxidation-resistant coatings

Designing oxidation-resistant coatings

Reaction Diffusion Behaviors for Interface Between Ni-Based Super Alloys and Vacuum Plasma Sprayed MCrAlY Coatings

Numerical Simulation of the Melting of Particles Injected in a Plasma Jet

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