Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques

Zulkifli, Intan Syaqirah Mohd; Yajid, Muhamad Azizi Mat; Idris, Mohd Hasbullah; Uday, M. B.; Daroonparvar, Mohammadreza; Emadzadeh, A.; Arshad, Azrina

doi:10.1016/j.ceramint.2020.06.001

Cited by 22 publications

(7 citation statements)

References 32 publications

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“…The maximum adhesion strength of 12.5 MPa obtained for the YSZ–Al 2 O 3 nanocomposite coating is comparable with the adhesion strength reported for the YSZ coatings deposited using the EPD technique by Amiri et al 43 . who studied electrophoretic deposition of YSZ coating on AZ91D magnesium alloy and using the APS technique by the Zulkifli et al 44 . on NiCoCrAlYTa‐coated Inconel 625 superalloy.…”

Section: Resultssupporting

confidence: 84%

“…Despite its importance, the adhesion of the electrophoretically deposited YSZ coating has rarely been investigated, and there is currently no available data regarding the adhesion of YSZ-Al 2 O 3 coatings. The maximum adhesion strength of 12.5 MPa obtained for the YSZ-Al 2 O 3 nanocomposite coating is comparable with the adhesion strength reported for the YSZ coatings deposited using the EPD technique by Amiri et al 43 who studied electrophoretic deposition of YSZ coating on AZ91D magnesium alloy and using the APS technique by the Zulkifli et al 44 on NiCoCrAlYTa-coated Inconel 625 superalloy. However, the adhesion strength of the studied YSZ-Al 2 O 3 nanocomposite coatings is considerably higher than that of the APS-deposited multilayer ceria and yttria-stabilized zirconia (CYSZ)-Al 2 O 3 micro-composite coatings.…”

Section: Phase Compositions Of Coatingssupporting

confidence: 82%

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YSZ–Al₂O₃ thermal barrier nanocomposites coatings: Electrophoretic deposition and characterization

Noroozpour,

Akbari

2023

Int J Applied Ceramic Tech

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This paper presents the development of yttria‐stabilized zirconia–alumina (YSZ–Al2O3) nanocomposite coatings deposited on Inconel 738LC superalloy substrates using the electrophoretic deposition technique. To prepare stable suspensions of YSZ and Al2O3 nanoparticles, a mixture of 75 mL acetone and 25 mL ethanol was used as a medium with .4 g/L iodine as a dispersant. The effects of Al2O3 concentration on suspension stability, electrical conductivity, and pH were studied in detail to optimize the suspension chemistry. The deposition kinetics were systematically investigated as a function of suspension concentration, deposition voltage, deposition time, and iodine concentration () to optimize the process parameters. The as‐dried coatings deposited at Vd = 10 V for 90 s were uniform, crack‐free, and sintered at 1150°C for 4 h. The microstructure, phase composition, hardness, and adhesion strength of the coatings were analyzed using scanning electron microscopy, X‐ray diffraction, Vickers microhardness measurements, and conducting shear loading tests, respectively. The results showed that adding Al2O3 to YSZ reduces porosity, crack density, and sintering temperature while stabilizing the tetragonal phase and retarding the martensitic transformation and crack formation. Among the studied coatings, the YSZ–20 wt.% Al2O3 nanocomposite coating deposited at Vd = 10 V for 90 s exhibited the most improved microstructural features, hardness, and adhesion strength.

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Section: Resultssupporting

confidence: 84%

Section: Phase Compositions Of Coatingssupporting

confidence: 82%

YSZ–Al₂O₃ thermal barrier nanocomposites coatings: Electrophoretic deposition and characterization

Noroozpour,

Akbari

2023

Int J Applied Ceramic Tech

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“…The above-mentioned articles [80][81][82] do not consider the addition of cooling systems in their work. Studies that have been conducted using typical commercial furnace [32,72,77,[83][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98][99] have also proven to not be capable of simulating the cooling air effect on TBC in advanced gas turbine operating condition. The developed custom-made test rigs are also limited to short test duration under cyclic condition and no cooling air effect under prolonged steady-state operating conditions.…”

Section: Isothermal Oxidation Test Rigmentioning

confidence: 99%

Test-Rig Simulation on Hybrid Thermal Barrier Coating Assisted with Cooling Air System for Advanced Gas Turbine under Prolonged Exposures—A Review

et al. 2021

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Thermal barrier coating (TBC) and cooling air systems are among the technologies that have been introduced and applied in pursuing the extensive development of advanced gas turbine. TBC is used to protect the gas turbine components from the higher operating temperature of advanced gas turbine, whereas cooling air systems are applied to assist TBC in lowering the temperature exposure of protected surfaces. Generally, a gas turbine operates in three main operational modes, which are base load, peak load, and part peak load. TBC performance under these three operational modes has become essential to be studied, as it will provide the gas turbine owners not only with the behaviors and damage mechanism of TBC but also a TBC life prediction in a particular operating condition. For TBC under base load or so called steady-state condition, a number of studies have been reviewed and discussed. However, it has been found that most of the studies have been conducted without the assistance of a cooling air system, which does not simulate the TBC in advanced gas turbine completely. From this review, the studies on TBC-assisted cooling air system to simulate the advanced gas turbine operating conditions have also been summarized, which are limited to test rig simulations under thermal cyclic mode where thermal cyclic represents peak and part peak load conditions. The equipment used to simulate the gas turbine operating condition, test temperatures, and durations are parameters that have been taken into consideration under this review. Finally, a test rig that is capable of simulating both TBC and cooling air effects at a high operating temperature of advanced gas turbines for prolonged exposure under steady-state condition has been proposed to be developed.

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“…Also, increasing the temperature causes a reduction in the wear rate and the friction coefficient of the coating. Zulkifli et al [14] deposited YSZ/Ni-CoCrAlYTa coating on the Inconel 625 substrate by the HVOF and APS processes and investigated the microstructure and thermal oxidation behaviors of coating. The results indicate that the coating applied by the HVOF process had a thin and continuous layer of thermally grown oxide (TGO) compared to the APS process.…”

Section: Introductionmentioning

confidence: 99%

Laser cladding of IN713 LC superalloy with Amdry 997 powder: microstructural evolution

Khorram¹

2023

Laser Phys.

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In this research, Amdry 997 powder was applied by a laser cladding process to the IN713 Low Carbon (IN713 LC) nickel-based superalloy. To evaluate the microstructural behaviors of the clad zones, different variables (the laser speed, laser frequency, and pulse width) were used in the laser cladding process. The final aim of this study was to achieve a clad zone without obvious cracks and pores with a low dilution ratio. The results showed that the upper region of the cladding includes very small equiaxed dendrites. The middle region of the cladding includes columnar dendrites. Equiaxed and columnar grains can be formed at the interface region. With an increase in the heat input of the laser (increasing the pulse width and laser frequency or decreasing the laser speed), the solidification rate reduces and consequently, a longer solidification time exists. Hence, more elongated grains are formed at the interface region. The microstructure of coatings in the upper and middle regions includes γ-Ni, β-NiAl and γ′-Ni3Al phases and TaC carbide, whereas the microstructure of the coatings at the interface region includes γ and β-NiAl and γ′-Ni3Al phases and M (Mo, Ta)C carbide. The optimum laser parameters that result in a low dilution ratio (14%) and a dense clad zone without obvious crack and porosity are a laser speed of 140 mm min−1,laser frequency of 14 Hz, and pulse width of 9 ms.

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Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques

Cited by 22 publications

References 32 publications

YSZ–Al₂O₃ thermal barrier nanocomposites coatings: Electrophoretic deposition and characterization

YSZ–Al₂O₃ thermal barrier nanocomposites coatings: Electrophoretic deposition and characterization

Test-Rig Simulation on Hybrid Thermal Barrier Coating Assisted with Cooling Air System for Advanced Gas Turbine under Prolonged Exposures—A Review

Laser cladding of IN713 LC superalloy with Amdry 997 powder: microstructural evolution

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Microstructural evaluation and thermal oxidation behaviors of YSZ/NiCoCrAlYTa coatings deposited by different thermal techniques

Cited by 22 publications

References 32 publications

YSZ–Al2O3 thermal barrier nanocomposites coatings: Electrophoretic deposition and characterization

YSZ–Al2O3 thermal barrier nanocomposites coatings: Electrophoretic deposition and characterization

Test-Rig Simulation on Hybrid Thermal Barrier Coating Assisted with Cooling Air System for Advanced Gas Turbine under Prolonged Exposures—A Review

Laser cladding of IN713 LC superalloy with Amdry 997 powder: microstructural evolution

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YSZ–Al₂O₃ thermal barrier nanocomposites coatings: Electrophoretic deposition and characterization

YSZ–Al₂O₃ thermal barrier nanocomposites coatings: Electrophoretic deposition and characterization