Two-Step Sintering Improved Compaction of Electrophoretic-Deposited YSZ Coatings

Desiati, Resetiana Dwi; Anawati, Anawati; Sugiarti, Eni

doi:10.1007/s11665-022-07004-y

Cited by 4 publications

(7 citation statements)

References 36 publications

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“…The hardness of the electrophoretically deposited YSZ coatings varies between 98 and 800 HV (.96–7.7 GPa), depending on deposition conditions (e.g., suspension, pH, and additives), particle size, sintering steps and temperature 38–40 . The hardness of the conventional YSZ coating studied here falls within the lower part of this range.…”

Section: Resultsmentioning

confidence: 82%

“…The hardness of the electrophoretically deposited YSZ coatings varies between 98 and 800 HV (.96-7.7 GPa), depending on deposition conditions (e.g., suspension, pH, and additives), particle size, sintering steps and temperature. [38][39][40] The hardness of the conventional YSZ coating studied here falls within the lower part of this range. The hardness of the conventional YSZ and YSZ-Al 2 O 3 nanocomposite coatings studied here is comparable with values reported for such coatings deposited using APS or EPD techniques.…”

Section: Phase Compositions Of Coatingsmentioning

confidence: 75%

“…Specifically, the coating deposited from a bath containing 20 wt.% Al 2 O 3 reached a hardness of 252 HV (2.47 GPa). The observed enhancement in hardness can be attributed to the improved coating microstructure, including reduced porosity, enhanced sintering, and decreased tendency for cracking.The hardness of the electrophoretically deposited YSZ coatings varies between 98 and 800 HV (.96-7.7 GPa), depending on deposition conditions (e.g., suspension, pH, and additives), particle size, sintering steps and temperature [38][39][40]. The hardness of the conventional YSZ coating studied here falls within the lower part of this range.…”

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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: Resultsmentioning

confidence: 82%

Section: Phase Compositions Of Coatingsmentioning

confidence: 75%

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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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“…The composition of Ni-strike solutions and Ni-watts has been described in previous publications [12]. Whereas, the YSZ solution has also been described elsewhere, which uses 3YSZ powder (3 mol% Y2O3, > 99%, Kanto, Japan) [13]. The EPD process and the sintering method used the gradient method, 20 V fo 60 V for 12 min for EPD and 750°C followed by 1200°C each held for 2 h for sintering.…”

Section: Sample Preparationmentioning

confidence: 99%

“…In the double-layer, around 9% of the nickel phase is detected. The transition from a raw powder or a green body which is mainly tetragonal to mainly monoclinic can have negative effects on zirconia restorations [13,14]. The monoclinic phase is considered to hurt the tolerance of the Thermal Barrier Coating due to microcracking caused by the volume expansion from the t-m transformation during heating and cooling [15].…”

Section: Phase Composition and Microstructure Before Corrosionmentioning

confidence: 99%

Corrosion behavior of YSZ and YSZ/NiCo coatings on inconel 625 exposed alkali chlorides

DESIATI,

SUGIARTI,

HERMANTO

et al. 2024

J Met Mater Miner

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Alkali chloride attack on boiler pipe walls is considered the main problem of corrosion in the waste-to-energy (WTE) industry, even though uses superalloy. Electrophoretic deposited (EPD) yttria-stabilized zirconia (YSZ) coating is carried out to protect the Inconel 625 substrate. YSZ is deposited directly both on the Inconel 625 substrate and NiCo-Inconel 625. Corrosion resistance was conducted using the 3.5% NaCl electrochemical test and the hot salt corrosion test at 600°C in alkaline salt media such as NaCl, KCl, and CaCl2. The potentiodynamic polarization curve shows that the YSZ coating deposited on the substrate (single-layer) has a corrosion rate of 0.065 mm∙y‒1, lower than that deposited on NiCo coating (double-layer). The double-layer, NiO2 is formed in the NiCo layer due to the NaCl solution being trapped. Meanwhile, in hot salt corrosion at 600°C, CaCrO4 is formed as a protective oxide layer. Furthermore, in the double-layer, an imperfect oxide layer is formed causing spallation and coating failure. The corrosion rate for single-layer hot salt corrosion for 40 h is 0.310 mm∙y‒1. As a result, the corrosion resistance of the single-layer is increased by the presence of the Cr2O3 oxide layer formed during sintering.

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A Direct Laser Sintering Approach for the Electrophoretic Deposition Overlay of Yttria-Stabilized Zirconia on the Surface of a Thermal Barrier Coating System

Ali Bash,

Ajeel,

Abbas

et al. 2023

Preprint

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The laser sintering process and modification of electrophoretic deposition (EPD) YSZ coatings on YSZ air plasma sprayed thermal barrier coatings (TBCs) were investigated. Ni-based superalloy was plasma sprayed using yttria-stabilized zirconia (YSZ) to perform thermal barrier coating with 400 μm thickness. The electrophoretic deposition (EPD) technique was used for depositing nanopowder of YSZ on the surface of YSZ TBCs. In this study, a technology of direct sintering the green EPD layer by laser beam was carried out. The best conditions of deposition YSZ overlay coating using DC current were obtained with applied voltage 40 V, deposition time 5 min, and suspension concentration 10 g/l. Iodine was added to the solutions as the stabilizing agent. To overcome the disadvantages of high sintering temperatures, laser sintering was taken as a new approach. Microstructures for all specimens were studied using Field Emission Scanning Electron Microscopy (FESEM) with EDS analysis. Surface roughness was investigated using AFM analysis and central line average (CLA). The results indicated that the morphology after the direct laser sintering of the EPD layer has a fine and controllable grain size, high hardness, and low roughness. Which is better than the direct laser on plasma-sprayed coatings.

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Two-Step Sintering Improved Compaction of Electrophoretic-Deposited YSZ Coatings

Cited by 4 publications

References 36 publications

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

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

Corrosion behavior of YSZ and YSZ/NiCo coatings on inconel 625 exposed alkali chlorides

A Direct Laser Sintering Approach for the Electrophoretic Deposition Overlay of Yttria-Stabilized Zirconia on the Surface of a Thermal Barrier Coating System

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Two-Step Sintering Improved Compaction of Electrophoretic-Deposited YSZ Coatings

Cited by 4 publications

References 36 publications

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

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

Corrosion behavior of YSZ and YSZ/NiCo coatings on inconel 625 exposed alkali chlorides

A Direct Laser Sintering Approach for the Electrophoretic Deposition Overlay of Yttria-Stabilized Zirconia on the Surface of a Thermal Barrier Coating System

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

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