Effect of superalloy substrate on the lifetime and interfacial toughness of electron beam physical vapor deposited thermal barrier coatings

Liu, C.; Zhang, Xun; Chen, Y.; Xiao, Ping

doi:10.1016/j.surfcoat.2019.124937

Cited by 7 publications

(5 citation statements)

References 41 publications

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“…After results from Zhao 47,51 the relation between stress and strain in TGO can be described by

σ_{TGO} = σ_{normalTGO normal, normal0} + \frac{E_{TGO}}{1 - ν_{TGO}} ε_{TGO},

where σ TGO is the stress in TGO for a given stain ε TGO . σ TGO,0 is the initial residual stress in the coating system and σ TGO,0 ≈ 0.9 GPa 14 .…”

Section: Damage Characterization In Tbcmentioning

confidence: 99%

“…The digital image correlation (DIC) technique is one of the most effective techniques for measuring the deformation distribution of structure surfaces. Applications of the DIC technique in the analysis of the TBC system subjected to mechanical loads were widely found in last decades 15,45–47 . After thermal exposure, the mechanical properties of the coating system are degraded.…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…Applications of the DIC technique in the analysis of the TBC system subjected to mechanical loads were widely found in last decades. 15,[45][46][47] After thermal exposure, the mechanical properties of the coating system are degraded. The critical strain for the coating failure on the specimen surface decreases with thermal exposure and can be measured by DIC in mechanical test.…”

Section: Evaluation Of Tbc Mechanical Properties With the 3d-dic Tech...mentioning

confidence: 99%

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Characterization of isothermal and cyclic thermal damage of EB‐PVD TBCs with the help of the 3D‐DIC technique

Yang

Yuan

2021

Fatigue Fract Eng Mat Struct

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The thermal barrier coatings (TBCs) are working under complex elevated temperature loading conditions. In the present work, a damage model for the isothermal and cyclic thermal loads was developed to quantify the failure process of the coatings subjected to isothermal and cyclic thermal exposures. Effects of different damage mechanisms, such as thermal exposure, thermal cycling, aluminum migration, and thermal dwell times, were experimentally and computationally studied. The digital image correlation (DIC) technique was introduced to evaluate degradation of TBCs. The complex damage can be quantified with the help of the DIC strain variations. The introduced model provides a general method to estimate the remaining life.

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“…After results from Zhao 47,51 the relation between stress and strain in TGO can be described by

σ_{TGO} = σ_{normalTGO normal, normal0} + \frac{E_{TGO}}{1 - ν_{TGO}} ε_{TGO},

where σ TGO is the stress in TGO for a given stain ε TGO . σ TGO,0 is the initial residual stress in the coating system and σ TGO,0 ≈ 0.9 GPa 14 .…”

Section: Damage Characterization In Tbcmentioning

confidence: 99%

Section: Materials and Experimentsmentioning

confidence: 99%

Section: Evaluation Of Tbc Mechanical Properties With the 3d-dic Tech...mentioning

confidence: 99%

See 1 more Smart Citation

Characterization of isothermal and cyclic thermal damage of EB‐PVD TBCs with the help of the 3D‐DIC technique

Yang

Yuan

2021

Fatigue Fract Eng Mat Struct

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“…There have been several studies [20][21][22][23][24][25][26] on the laser modification of TBCs, but none have looked at the hot corrosion and hot corrosion + CMAS behavior of YSZ modified with the optimum laser parameters. By reducing the network structure of the cracks and the crater-like pits on the coating in this study, both corrosion resistance and mechanical-microstructural properties were also enhanced.…”

Section: Introductionmentioning

confidence: 99%

Hot corrosion and CMAS degradation of laser-glazed YSZ coating with optimum parameter

Avcı,

Karabaş,

Akdoğan Eker

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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The purpose of this research is to look into the effect of laser surface modification on the hot corrosion and hot corrosion + calcium–magnesium aluminosilicate (CMAS) resistance of YSZ thermal barrier coating. Metco AMDRY 997 (Ni–22Cr–10Al–Y) powder was coated as a bond coat on the AISI 304L stainless steel substrate using a high-velocity oxy-fuel spray technique. As a ceramic top layer, 204 NS YSZ (ZrO2·8Y2O3) particles were plasma sprayed on the bond coat. Following that, the entire coating surface was treated with a 20-kHz pulsed CO2 laser to increase the coatings’ surface performance. A corrosion test was carried out in a box furnace for 20 h at 1050 °C. SEM images of laser-glazed coatings revealed denser surfaces than those of air-spraying coatings. The laser-modified coating is more resistant to hot corrosion than unmodified coatings. The X-ray diffraction analysis revealed that the reaction between yttria (Y2O3) and V2O5 resulted in the formation of YVO4 crystals as a corrosion product. According to energy dispersive spectroscopy results, laser-glazed coatings reduced molten salt diffusion from surface to bond coat. As a result, laser-glazed coatings demonstrated improved hot corrosion resistance and decreased corrosion products on the bond coat zone. After the hot corrosion test, the laser-treated composite had a 55% lower thermally grown oxide layer than untreated APS YSZ. The optimum laser parameter was used as 77.7 W laser power, 120 mm/s scanning speed, and 215 mm laser distance.

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“…TBCs usually consist of three layers: substrate, bond coating, and top coating. In general, the top coating layer is formed on a substrate composed of a super heat-resistant alloy [4,5]. The bond coating is used to accommodate differences in the thermal expansion coefficient between the ceramic coating and the metallic substrate under practical conditions, and to protect the substrate from harsh environments.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Structure and Physical Properties of High-Entropy Oxide Coatings Prepared via Atmospheric Plasma Spraying

et al. 2021

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The feasibility of using a high-entropy rare-earth oxide (REO) as a top coating material for thermal barrier coatings was explored using the atmospheric plasma spray technique. The microstructure and Vickers hardness of the coating layer were compared to those of an 8 mol % yttria-stabilized zirconia (8YSZ) top coating material. Macroscopic observations revealed the formation of a well-coated surface with no surface defects or delamination. Scanning electron microscopy images showed the presence of several parallel and vertical microcracks in the REO and 8YSZ coating layers. The origin of these cracks is attributed to differences in the coefficient of thermal expansion, very fast cooling, and process parameters. X-ray diffraction demonstrated the high phase stability and excellent thermal properties of REO due to the absence of phase transformation after plasma spray processing. The measured Vickers hardness of REO was 425 HV, which is lower than that of sintered REO powder and the 8YSZ coating.

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Effect of superalloy substrate on the lifetime and interfacial toughness of electron beam physical vapor deposited thermal barrier coatings

Cited by 7 publications

References 41 publications

Characterization of isothermal and cyclic thermal damage of EB‐PVD TBCs with the help of the 3D‐DIC technique

Characterization of isothermal and cyclic thermal damage of EB‐PVD TBCs with the help of the 3D‐DIC technique

Hot corrosion and CMAS degradation of laser-glazed YSZ coating with optimum parameter

Interfacial Structure and Physical Properties of High-Entropy Oxide Coatings Prepared via Atmospheric Plasma Spraying

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