Fracture toughness measurements of plasma-sprayed thermal barrier coatings using a modified four-point bending method

Zhao, Pengfei; Sun, Chencheng; Zhu, Xiaolu; Shang, Fulin; Li, Chang-Jiu

doi:10.1016/j.surfcoat.2010.05.029

Cited by 80 publications

(28 citation statements)

References 31 publications

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“…It can be seen that the normal stress σ i and the shear stress τ i at the interface for the thinner coating systems are 360. [17,18,22]. For the thinner coatings, the residual normal stress is obviously larger than the tension strength of the coatings of 200 MPa, thus the transverse cracks in the coatings emerge.…”

Section: Transverse Crackmentioning

confidence: 99%

Thickness-dependent fracture characteristics of ceramic coatings bonded on the alloy substrates

Liang

Xie

et al. 2014

Surface and Coatings Technology

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Section: Transverse Crackmentioning

confidence: 99%

Thickness-dependent fracture characteristics of ceramic coatings bonded on the alloy substrates

Liang

Xie

et al. 2014

Surface and Coatings Technology

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“…Generally, the temperature decreases across TBCs at specific operation condition are governed by the material and geometrical properties of the TC layer, especially the thermal conductivity and thickness [3][4][5][6][7][8][9]. For a given ceramic material, the thermal insulation capability of the coatings enhances with the increase of TC thickness.…”

Section: Introductionmentioning

confidence: 99%

Design of Thermal Barrier Coatings Thickness for Gas Turbine Blade Based on Finite Element Analysis

Fan

et al. 2017

Mathematical Problems in Engineering

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Thermal barrier coatings (TBCs) are deposited on the turbine blade to reduce the temperature of underlying substrate, as well as providing protection against the oxidation and hot corrosion from high temperature gas. Optimal ceramic top-coat thickness distribution on the blade can improve the performance and efficiency of the coatings. Design of the coatings thickness is a multiobjective optimization problem due to the conflicts among objectives of high thermal insulation performance, long operation durability, and low fabrication cost. This work developed a procedure for designing the TBCs thickness distribution for the gas turbine blade. Three-dimensional finite element models were built and analyzed, and weighted-sum approach was employed to solve the multiobjective optimization problem herein. Suitable multiregion top-coat thickness distribution scheme was designed with the considerations of manufacturing accuracy, productivity, and fabrication cost.

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“…The method has been successfully used to evaluate a variety of 'blanket' multilayers [3][4][5][6][7]. However, in order to apply load to the specimen, the configuration is conventionally applied on the macroscale.…”

Section: Introductionmentioning

confidence: 99%

Inducing stable interfacial delamination in a multilayer system by four-point bending of microbridges

Mead

Huang

2017

Surface and Coatings Technology

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The ability to produce stable delamination of thin film multilayer interfaces is a powerful tool for studying the interfacial adhesion within microsystems. In this study, a technique involving the four-point bending of microbridges was applied to initiate stable interfacial delamination within a multilayer system. Microscale pre-notched bridges with clamped-ends were machined into an Al/SiN/GaAs multilayer using focus ion beam milling. A square flat-end indenter was used to induce bending of the bridge by two contact locations. Bridge failure occurred via substrate fracture at the pre-notch, followed by crack deflection, and stable interfacial delamination of the SiN/GaAs interface. Substrate fracture and delamination were identified within the obtained load-displacement curves as a pop-in and region of linear load reduction respectively.

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Fracture toughness measurements of plasma-sprayed thermal barrier coatings using a modified four-point bending method

Cited by 80 publications

References 31 publications

Thickness-dependent fracture characteristics of ceramic coatings bonded on the alloy substrates

Thickness-dependent fracture characteristics of ceramic coatings bonded on the alloy substrates

Design of Thermal Barrier Coatings Thickness for Gas Turbine Blade Based on Finite Element Analysis

Inducing stable interfacial delamination in a multilayer system by four-point bending of microbridges

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