Isothermal Oxidation Behavior of Supersonic Atmospheric Plasma-Sprayed Thermal Barrier Coating System

Bai, Yu; Chen, Ding; Li, Hongqiang; Han, Zelin; Ding, Bingjun; Wang, Zhihui; Yu, Lie

doi:10.1007/s11666-013-9979-7

Cited by 33 publications

(19 citation statements)

References 31 publications

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“…The red layer represents the initial MZ whilst the green layer represents the initial alumina layer. The dark blue layers, composed of 12 sub-layers of equal thickness due to the constant growth rate at long time intervals as experimentally observed [16,17], represent the MZ, with a total thickness of 2 m. The light brown layers represent the alumina layers, with 24 sublayers of varying thicknesses since alumina layer growth usually follows a parabolic line [4]. The simulation of TGO growth was divided into three stages to match previous experimental observations [14,15].…”

Section: The Numerical Simulationmentioning

confidence: 96%

“…Previous studies assessing the displacement instability caused by TGO have usually regarded the TGO phase as a pure alumina layer. However, the TGO is mainly dense and uniform -Al 2 O 3 in the early stage of TBCs, then transforming to a MZ due to the depletion of aluminum [10,14,17]. The MZ is usually located between the top coat and the alumina layer [15,18].…”

Section: Effects Of Mixed Zone Thickness Growth Ratementioning

confidence: 99%

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Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors

Wang¹,

Ding

Song³

et al. 2016

Science and Technology of Nuclear Installations

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Thermally grown oxide (TGO), commonly pure α-Al2O3, formed on protective coatings acts as an insulation barrier shielding cooled reactors from high temperatures in nuclear energy systems. Mixed zone (MZ) oxide often grows at the interface between the alumina layer and top coat in thermal barrier coatings (TBCs) at high temperature dwell times accompanied by the formation of alumina. The newly formed MZ destroys interface integrity and significantly affects the displacement instabilities of TGO. In this work, a finite element model based on material property changes was constructed to investigate the effects of MZ on the displacement instabilities of TGO. MZ formation was simulated by gradually changing the metal material properties into MZ upon thermal cycling. Quantitative data show that MZ formation induces an enormous stress in TGO, resulting in a sharp change of displacement compared to the alumina layer. The displacement instability increases with an increase in the MZ growth rate, growth strain, and thickness. Thus, the formation of a MZ accelerates the failure of TBCs, which is in agreement with previous experimental observations. These results provide data for the understanding of TBC failure mechanisms associated with MZ formation and of how to prolong TBC working life.

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Section: The Numerical Simulationmentioning

confidence: 96%

Section: Effects Of Mixed Zone Thickness Growth Ratementioning

confidence: 99%

Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors

Wang¹,

Ding

Song³

et al. 2016

Science and Technology of Nuclear Installations

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“…To the best of author's knowledge, so far, no work has been reported on the suspension plasma spray of GZ/YSZ multilayered TBCs and not much work is seen on the isothermal oxidation studies of GZ based TBCs. Also, most of the isothermal oxidation studies on YSZ reported so far are in the range of 1100°C or below . This study aimed at comparing the isothermal oxidation performance of GZ/YSZ multilayered TBCs with the standard 8YSZ single‐layer TBC at a higher temperature (1150°C).…”

Section: Introductionmentioning

confidence: 99%

“…Also, most of the isothermal oxidation studies on YSZ reported so far are in the range of 1100°C or below. [19][20][21][22][23] This study aimed at comparing the isothermal oxidation performance of GZ/YSZ multilayered TBCs with the standard 8YSZ single-layer TBC at a higher temperature (1150°C). Single-layer YSZ, doublelayer GZ/YSZ, and triple-layer GZdense/GZ/YSZ with denser gadolinium zirconate on top of GZ/YSZ were suspension plasma sprayed.…”

Section: Introductionmentioning

confidence: 99%

Isothermal Oxidation Behavior of Gd₂Zr₂O₇/YSZ Multilayered Thermal Barrier Coatings

Mahade

Curry

et al. 2016

Int J Applied Ceramic Tech

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Efficiency of a gas turbine can be increased by increasing the operating temperature. Yttria-stabilized zirconia (YSZ) is the standard thermal barrier coating (TBC) material used in gas turbine applications. However, above 1200°C, YSZ undergoes significant sintering and CMAS (calcium magnesium alumino silicate) infiltration. New ceramic materials of rare earth zirconate composition such as gadolinium zirconate (GZ) are promising candidates for thermal barrier coating applications (TBC) above 1200°C. Suspension plasma spray of single-layer YSZ, double-layer GZ/YSZ, and a triple-layer TBC comprising denser GZ on top of GZ/YSZ TBC was attempted. The overall coating thickness in all three TBCs was kept the same. Isothermal oxidation performance of the three TBCs along with bare substrate and bond-coated substrate was investigated for time intervals of 10 h, 50 h, and 100 h at 1150°C in air environment. Weight gain/loss analysis was carried out by sensitive weighing balance. Microstructural analysis was carried out using scanning electron microscopy (SEM). As-sprayed single-layer YSZ and double-layer GZ/YSZ showed columnar microstructure, whereas the denser layer in the triple-layer TBC was not columnar. Phase analysis of the top surface of as-sprayed TBCs was carried out using XRD. Porosity measurements were made by water intrusion method. In the weight gain analysis and SEM analysis, multilayered TBCs showed lower weight gain and lower TGO thickness compared to single-layer YSZ.

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“…A potential way to overcome these problems is the deposition of thermally sprayed coatings on the surfaces of the components, which can be prepared by several thermal spraying techniques such as highvelocity oxygen fuel (HVOF) spraying, detonation gun (D-gun) spraying, plasma spraying (APS), cold spraying, etc. (Ref [6][7][8][9]. Nowadays, wire-arc spraying coatings deposited from cored wires are more and more universally used in many industrial applications, including the oxidation and corrosion protection at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and High Temperature Corrosion Behavior of Wire-Arc Sprayed FeCrSiB Coating

Zhou

et al. 2015

J Therm Spray Tech

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Nowadays, wire-arc spraying is an attractive technique to deposit coatings for oxidation and corrosion protection. In this study, a new FeCrSiB-cored wire was designed to produce protective coatings for the components used in high temperature environment by wire-arc spraying. The microstructure, phase composition, microhardness, and high temperature corrosion behavior of the new coating were investigated in comparison with a FeCr coating and a commercial NiCrTi coating. The results showed that the FeCrSiB coating was composed of dense lamella with much fewer oxide inclusions than the FeCr and NiCrTi coatings. The microhardness of the FeCrSiB coating was the highest of the three coatings. Thermogravimetric analysis was used to evaluate the high temperature corrosion behavior of the coatings in mixed salt Na 2 SO 4 -25% K 2 SO 4 environment at 650°C under cyclic condition. It showed that the high temperature corrosion resistance of the FeCrSiB coating is significantly better than that of the FeCr coating and approaching to the commercial NiCrTi coating.

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Isothermal Oxidation Behavior of Supersonic Atmospheric Plasma-Sprayed Thermal Barrier Coating System

Cited by 33 publications

References 31 publications

Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors

Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors

Isothermal Oxidation Behavior of Gd₂Zr₂O₇/YSZ Multilayered Thermal Barrier Coatings

Microstructure and High Temperature Corrosion Behavior of Wire-Arc Sprayed FeCrSiB Coating

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Isothermal Oxidation Behavior of Supersonic Atmospheric Plasma-Sprayed Thermal Barrier Coating System

Cited by 33 publications

References 31 publications

Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors

Effects of a Mixed Zone on TGO Displacement Instabilities of Thermal Barrier Coatings at High Temperature in Gas-Cooled Fast Reactors

Isothermal Oxidation Behavior of Gd2Zr2O7/YSZ Multilayered Thermal Barrier Coatings

Microstructure and High Temperature Corrosion Behavior of Wire-Arc Sprayed FeCrSiB Coating

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Isothermal Oxidation Behavior of Gd₂Zr₂O₇/YSZ Multilayered Thermal Barrier Coatings