A method for in situ measurement of the elastic behavior of a columnar thermal barrier coating

Eberl, C.; Gianola, Daniel S.; Wang, X.; He, Ming; Evans, A.G.; Hemker, Kevin J.

doi:10.1016/j.actamat.2011.02.034

Cited by 36 publications

(18 citation statements)

References 15 publications

(21 reference statements)

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“…These values would be consistent with reports that the toughness of this interface can be as high as 400 J•m -2 in mode II [43]. There are, however, substantially lower estimates [44,45] as measurement of this interfacial toughness has been an elusive problem.…”

Section: Submitted To Acta Materialia (September 2016) -Manuscript Unsupporting

confidence: 89%

Response of molten silicate infiltrated Gd2Zr2O7 thermal barrier coatings to temperature gradients

et al. 2017

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The delamination tendency for bilayer gadolinium zirconate/yttria-stabilized zirconia (GZO/YSZ) thermal barrier coatings (TBCs) was investigated using a continuous laser-based thermal gradient test and a computational model for the analysis of multilayer structures. TBCs with different architectures were exposed to molten silicate compositions, representative of aeroengine deposits, and subjected to thermal cycles prescribed to impart specified levels of strain energy in the coating. The exposed surface of the intercolumnar gaps in the outer part of the GZO layer was found to rapidly dissolve into the intruding molten silicate and precipitate reaction products that seal the flow paths, limiting the penetration depth and the ensuing stiffening of the TBC. Nevertheless, the stiffened layer magnifies the thermal stresses in the coating upon thermal cycling. The influence of the thermal history and multilayer structure on the driving force for delamination was modeled and compared with the experimental results. The effects that the substrate coefficient of thermal expansion, the temperature gradient, and the TBC thickness have on the driving force for delamination were analyzed and the critical amount of stored elastic strain energy for failure under different scenarios was assessed.

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Section: Submitted To Acta Materialia (September 2016) -Manuscript Unsupporting

confidence: 89%

Response of molten silicate infiltrated Gd2Zr2O7 thermal barrier coatings to temperature gradients

et al. 2017

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“…The current study examines the influence of the fly ash deposition on the mechanical properties, specifically the Young's modulus, of the ceramic top coat. Eberl et al found that a typical EB-PVD YSZ coating has an elastic modulus of 15 -30 GPa [7]. To determine the Young's modulus values of the areas of TBC with varying amount of deposition, a table top load-based multiple-partial unloading micro-indentation system is used.…”

Section: Introductionmentioning

confidence: 99%

Effects of Syngas Particulate Fly Ash Deposition on the Mechanical Properties of Thermal Barrier Coatings on Simulated Film-Cooled Turbine Vane Components

Luo¹,

Nix²,

Kang³

et al. 2014

IJCCE

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Research is being conducted to study the effects of particulate deposition from contaminants in coal synthesis gas (syngas) on the mechanical properties of thermal barrier coatings (TBC) employed on integrated gasification combined cycle (IGCC) turbine hot section airfoils. West Virginia University (WVU) had been working with US Department of Energy, National Energy Technology Laboratory (NETL) to simulate deposition on the pressure side of an IGCC turbine first stage vane. To model the deposition, coal fly ash was injected into the flow of a combustor facility and deposited onto TBC coated, angled film-cooled test articles in a high pressure (approximately 4 atm) and a high temperature (1560 K) environment. To investigate the interaction between the deposition and the TBC, a load-based multiple-partial unloading micro-indentation technique was used to quantitatively evaluate the mechanical properties of materials. The indentation results showed the Young's Modulus of the ceramic top coat was higher in areas with deposition formation due to the penetration of the fly ash. This corresponds with the reduction of strain tolerance of the 7% yttria-stabilized zirconia (7YSZ) coatings.

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“…To interrogate the mechanical properties of these small uniaxial metamaterial samples, especially to determine Poisson's ratio v for a particular pushing direction, we use an established approach that directly relates to the definition of v 21. In brief, while gently pushing a crosshead plate onto the top of the structure along the longitudinal z ‐direction (i.e., normal to the sample substrate), a camera monitors the sample side wall in the xz ‐plane.…”

mentioning

confidence: 99%

Tailored 3D Mechanical Metamaterials Made by Dip‐in Direct‐Laser‐Writing Optical Lithography

et al. 2012

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Dip-in direct-laser-writing (DLW) optical lithography allows fabricating complex three-dimensional microstructures without the height restrictions of regular DLW. Bow-tie elements assembled into mechanical metamaterials with positive/zero/negative Poisson's ratio and with sufficient overall size for direct mechanical characterization aim at demonstrating the new possibilities with respect to rationally designed effective materials.

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A method for in situ measurement of the elastic behavior of a columnar thermal barrier coating

Cited by 36 publications

References 15 publications

Response of molten silicate infiltrated Gd2Zr2O7 thermal barrier coatings to temperature gradients

Response of molten silicate infiltrated Gd2Zr2O7 thermal barrier coatings to temperature gradients

Effects of Syngas Particulate Fly Ash Deposition on the Mechanical Properties of Thermal Barrier Coatings on Simulated Film-Cooled Turbine Vane Components

Tailored 3D Mechanical Metamaterials Made by Dip‐in Direct‐Laser‐Writing Optical Lithography

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