Protective coatings in the gas turbine engine

Demasi-Marcin, Jeanine T.; Gupta, Dhruv

doi:10.1016/0257-8972(94)90129-5

Cited by 417 publications

(166 citation statements)

References 5 publications

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“…Current market need of the gas turbine industry is to achieve higher efficiency in order to improve the fuel economy and lower harmful emissions. Such an increase in efficiency of gas turbines can be achieved by increasing the combustion temperature [1][2][3]. Higher combustion temperatures (>1200 º C) pose severe challenges to the TBCs such as sintering, phase instability, oxidation, and CMAS (Calcium Magnesium Alumino Silicates) infiltration.…”

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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“…Common processes for overlay coating deposition are: vacuum plasma spraying (VPS), atmospheric plasma spraying (APS), high-velocity oxy-fuel (HVOF) spraying, low-pressure plasma spraying (LPPS) and electron beam physical vapor deposition (EB-PVD) [1,3,8,9]. The former two produce coatings with a characteristic splat-on-splat structure.…”

Section: Introductionmentioning

confidence: 99%

“…The combustor and turbine sections of gas turbines offer harsh environments for structural parts and the materials for such applications need to withstand considerable oxidation and corrosion [1].…”

Section: Introductionmentioning

confidence: 99%

“…Overlay coatings have gained usage both as stand-alone protective coatings and as bond coats in thermal barrier coating (TBC) systems [1,4,7]. Common processes for overlay coating deposition are: vacuum plasma spraying (VPS), atmospheric plasma spraying (APS), high-velocity oxy-fuel (HVOF) spraying, low-pressure plasma spraying (LPPS) and electron beam physical vapor deposition (EB-PVD) [1,3,8,9].…”

Section: Introductionmentioning

confidence: 99%

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Modeling of microstructural evolution and lifetime prediction of MCrAlY coatings on nickel based superalloys during high temperature oxidation

Yuan

Eriksson

Peng

et al. 2013

Surface and Coatings Technology

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MCrAlY coatings are deposited onto superalloys to provide oxidation and corrosion protection at high temperature by the formation of a thermally grown oxide scale. In this project, the oxidation behaviour of a HVOF CoNiCrAlYSi coating on IN792 was studied for both isothermal oxidation (900, 1000 and 1100 °C) and thermal cycling (100-1100 °C). The microstructural evolution of the CoNiCrAlYSi coatings after oxidation was investigated. It was found that the Al-rich β phase is gradually consumed due to two effects: surface oxidation and coating-substrate interdiffusion. Some voids and oxides along the coating-substrate interface, or inside the coating, were considered to play a role in blocking the diffusion of alloying elements. Based on the microstructural observation, an oxidation-diffusion model, considering both surface oxidation and coating-substrate interdiffusion, was developed by using Matlab and DICTRA software to predict the useful life of MCrAlY coatings.A new concept of diffusion blocking is also introduced into the model to give more accurate description on the microstructural evolution. The results from modeling and the experimentally established composition profiles showed good agreement.

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“…Thermal barrier coating (TBC) systems have become common in gas turbines as they lower the temperature of the underlying substrate and provide protection against high-temperature degradation of the substrate materials [1]. TBC systems thus prolong the life of structural parts, as well as increase the gas turbine efficiency by enabling higher combustion temperatures [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influence of substrate material on the life of atmospheric plasma sprayed thermal barrier coatings

Eriksson

Johansson

Brodin

et al. 2013

Surface and Coatings Technology

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Thermal barrier coatings (TBCs) are used in gas turbines to prolong the life of the underlying substrates and to increase the efficiency of the turbines by enabling higher combustion temperatures. TBCs may fail during service due to thermal fatigue or through the formation of non-protective thermally grown oxides (TGOs). This study compares two atmospheric plasma sprayed (APS) TBC systems comprising of two identical TBCs deposited on two different substrates (Haynes 230 and Hastelloy X). The thermal fatigue life was found to differ between the two TBC systems. The interdiffusion of substrate elements into the coating was more pronounced in the TBC system with shorter life, however, very few of the substrate elements (only Mn and to some extent Fe) formed oxides in the bond coat/top coat interface. Fractography revealed no differences in the fracture behaviour of the TBCs; the fracture occurred, in both cases, to about 60 % in the top coat close to the interface and the remainder in the interface. Nanoindentation revealed only small differences in mechanical properties between the TBC systems and a finite element crack growth analysis showed that such small differences did not cause any significant change in the crack driving force. The oxidation kinetics was found to be similar for both TBC systems for the formation * Corresponding author.

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Protective coatings in the gas turbine engine

Cited by 417 publications

References 5 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

Modeling of microstructural evolution and lifetime prediction of MCrAlY coatings on nickel based superalloys during high temperature oxidation

Influence of substrate material on the life of atmospheric plasma sprayed thermal barrier coatings

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