Vacuum heat treatment mechanisms promoting the adhesion strength of thermally sprayed metallic coatings

Meng, Guo-Hui; Zhang, Bang‐Yan; Li, Chang-Jiu; Yang, Guan-Jun; Xu, Tong

doi:10.1016/j.surfcoat.2018.03.010

Cited by 54 publications

(15 citation statements)

References 26 publications

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“…The stress tolerance of the TBCs is not only related to the microstructure and porosity of the coating but also depends on the Young's modulus. [32][33][34] TBCs with low Young's modulus produce lower thermal stress under the same thermal deformation conditions and possess higher resistance to failure and damage. 35 Figure 4A-G shown the three-dimensional (3D) distribution of Young's modulus for RENbO 4 ceramics.…”

Section: Young's Modulus and Hardnessmentioning

confidence: 99%

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Zhou

et al. 2019

J Am Ceram Soc

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In this work, RENbO4 (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics with low density, low Young's modulus, low thermal conductivity, and high thermal expansion have been systematically investigated, the excellent thermo‐mechanical properties indicate that RENbO4 ceramics possess the potential as the new generation of thermal barrier coatings (TBCs) materials. X‐ray diffraction and Raman spectroscopy phase structure identification reveal that all dense bulk specimens obtained by high‐temperature solid‐state reaction belonged to the monoclinic (m) phase with C12/c1 space group. The ferroelastic domains are detected in the specimens, revealing the ferroelastic transformation between tetragonal (t) and monoclinic (m) phases of RENbO4 ceramics. The Young's modulus and hardness of the RENbO4 ceramics measured by the NanoBlitz 3D nanoindentation method are discussed in details, and the lower Young's modulus (60‐170 GPa) and higher hardness (the maximum value reaches 11.48 GPa) indicating that higher resistance of RENbO4 ceramics to failure and damage. Lower thermal conductivity (1.42‐2.21 W [m k]−1 at 500°C‐900°C) and lower density (5.330‐7.400 g/cm3) than other typical TBCs materials give RENbO4 ceramics the unique advantage of being new TBCs materials. Meanwhile, the thermal expansion coefficients of RENbO4 ceramics reach 9.8‐11.6 × 10−6 k−1 and are comparable or higher than other typical TBCs materials. According to the first‐order derivative of the thermal expansion rate, the temperature of the ferroelastic transformation of RENbO4 ceramics can be observed.

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Section: Young's Modulus and Hardnessmentioning

confidence: 99%

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Zhou

et al. 2019

J Am Ceram Soc

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“…Finite Element Method (FEM) was applied to understand the temperature evolution of QR code samples during the heating-up/cooling-down processes before the infrared thermal imaging. The heat transfer in the vacuum drying oven cabinet was comprised of conduction, convection and radiation [42,43]. In this study, convection was neglected as the heating process was in a vacuum environment.…”

Section: Finite Element Analysis Of Heat Distributionsmentioning

confidence: 99%

Embedding anti-counterfeiting features in metallic components via multiple material additive manufacturing

Wei

Sun

Huang

et al. 2018

Additive Manufacturing

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“…A classical thermal barrier coating structure is composed of a ceramic coat and bonding coat. The former is mainly for thermal insulation, while the latter is to relieve the stress caused by thermal expansion mismatch between the superalloy and ceramic coat [ 4 , 5 , 6 , 7 ]. In order to optimize the performance of the ceramic coating, coatings with different microstructures can be obtained by utilizing different processes.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Dependence of Effective Thermal Conductivity of EB-PVD TBCs

Qiu

Huang

et al. 2021

Materials

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Microstructure dependence of effective thermal conductivity of the coating was investigated to optimize the thermal insulation of columnar structure electron beam physical vapor deposition (EB-PVD coating), considering constraints by mechanical stress. First, a three-dimensional finite element model of multiple columnar structure was established to involve thermal contact resistance across the interfaces between the adjacent columnar structures. Then, the mathematical formula of each structural parameter was derived to demonstrate the numerical outcome and predict the effective thermal conductivity. After that, the heat conduction characteristics of the columnar structured coating was analyzed to reveal the dependence of the effective thermal conductivity of the thermal barrier coatings (TBCs) on its microstructure characteristics, including the column diameter, the thickness of coating, the ratio of the height of fine column to coarse column and the inclination angle of columns. Finally, the influence of each microstructural parameter on the mechanical stress of the TBCs was studied by a mathematic model, and the optimization of the inclination angle was proposed, considering the thermal insulation and mechanical stress of the coating.

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Vacuum heat treatment mechanisms promoting the adhesion strength of thermally sprayed metallic coatings

Cited by 54 publications

References 26 publications

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Embedding anti-counterfeiting features in metallic components via multiple material additive manufacturing

Microstructure Dependence of Effective Thermal Conductivity of EB-PVD TBCs

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Vacuum heat treatment mechanisms promoting the adhesion strength of thermally sprayed metallic coatings

Cited by 54 publications

References 26 publications

The thermo‐mechanical properties and ferroelastic phase transition of RENbO4(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO4(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Embedding anti-counterfeiting features in metallic components via multiple material additive manufacturing

Microstructure Dependence of Effective Thermal Conductivity of EB-PVD TBCs

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Product

Resources

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The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics