Evaluation of interface degradation during cyclic oxidation of EB-PVD thermal barrier coatings and correlation with TGO luminescence

Tolpygo, V.K.; Clarke, David R.; Murphy, K. S.

doi:10.1016/j.surfcoat.2004.08.001

Cited by 80 publications

(38 citation statements)

References 18 publications

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“…On the contrary, the sol-gel TBC, largely spalled off, is characterized by high rumpling attested by both cross-section and surface imaging. The crack pattern present in the sol-gel TBC fragments the ceramic which cannot constrain the bond coat and avoid its deformation as in standard EB-PVD TBC [13]. The occurrence of more pronounced rumpling in the case of sol-gel TBC indicates the lower adherence of those barriers as compared to standard EB-PVD barriers.…”

Section: Rumpling Of the Bond Coatmentioning

confidence: 99%

Sol–gel thermal barrier coatings: Optimization of the manufacturing route and durability under cyclic oxidation

Sniezewski¹,

Maoult²,

Lours³

et al. 2010

Surface and Coatings Technology

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 4750 A new promising and versatile process based on the sol-gel transformation has been developed to deposit yttria-stabilised thermal barrier coatings. The non-oriented microstructure with randomly structured pore network, resulting from the soft chemical process, is expected to show satisfactory thermo-mechanical behaviour when the TBC is cyclically oxidized. First stage of the research consists of optimizing the processing route to generate homogeneous microstructure and controlled surface roughness. The objective is to reduce, as much as possible, the size and depth of the surface cracks network inherent to the process. Indeed, the durability of the TBC when cyclically oxidized strongly depends on the sharpness of those cracks that concentrate thermo-mechanical stresses and generate detrimental propagation resulting in spallation. Cyclic oxidation tests are performed using a cyclic oxidation rig instrumented with CCD cameras to monitor in a real time basis the mechanism of crack propagation and spallation. The impact of various parameters either directly related to the processing route, e.g. the intimate microstructure of the TBC and the TBC thickness, or to the thermal loading, e.g. the oxidation temperature and the cumulated hot time, on the durability of the TBC is investigated.

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Section: Rumpling Of the Bond Coatmentioning

confidence: 99%

Sol–gel thermal barrier coatings: Optimization of the manufacturing route and durability under cyclic oxidation

Sniezewski¹,

Maoult²,

Lours³

et al. 2010

Surface and Coatings Technology

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“…The growth of this oxide [3] and the sintering [5] of the YSZ layer during thermal ageing are the main sources of residual stresses in the TGO and YSZ and lead to the eventual failure of the coating system. The extensive use of the YSZ layer as a TBC has given rise to much research focused on how the degradation of this coating system depends upon different application methods [6], the microstructure of the coatings [7] and [8], and the residual stress distributions in the YSZ and TGO layers [9], [10] and [11]. Among the non-destructive approaches to material investigation, Raman and photostimulated luminescence piezeo-spectroscopy (PLPS) are the techniques favoured for the measurement of stresses in YSZ and TGO respectively.…”

Section: Introductionmentioning

confidence: 99%

The role of beam dispersion in Raman and photo-stimulated luminescence piezo-spectroscopy of yttria-stabilized zirconia in multi-layered coatings

et al. 2013

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Laser beam dispersion affects the resolution of Raman and photo-stimulated luminescence piezo-spectroscopy measurements of transparent materials. In this paper, we investigate the lateral spreading of the laser beam and the axial sampling depth of Raman spectroscopy measurements within thermal sprayed yttria-stabilized zirconia (YSZ) thin coatings. The lateral diameters of the laser beams (λ = 632.8 nm and 514 nm) reach approximately ∼160 µm after travelling through a thickness of 200 µm of air plasma sprayed (APS) YSZ and ∼80 µm after travelling through 120 µm of electron beam physical vapour deposited YSZ. The Raman spectroscopy sampling depth was found to be between 30 and 40 µm in APS YSZ. The beam dispersions within these two coatings were simulated using the ray-tracing software ZEMAX to understand the observed scattering patterns. The results are discussed with respect to the application of these two spectroscopic techniques in multi-layered thermal barrier coating systems.

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“…Although rumpling of the TGO layer has been a crucial research subject because of its inherent link to TBC reliability and lifetime [12][13][14][15][16][17][18][19], the undulation behavior is usually studied under cyclic conditions without externally applied loads, or by creep tests under isothermal conditions [18][19]. Reports on the combined effect of thermal cycling and applied loading (hereafter denoted as thermo-mechanical fatigue, or TMF) are scarce.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic TGO rumpling in EB-PVD thermal barrier coatings under in-phase thermomechanical loading

et al. 2011

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Evaluation of interface degradation during cyclic oxidation of EB-PVD thermal barrier coatings and correlation with TGO luminescence

Cited by 80 publications

References 18 publications

Sol–gel thermal barrier coatings: Optimization of the manufacturing route and durability under cyclic oxidation

Sol–gel thermal barrier coatings: Optimization of the manufacturing route and durability under cyclic oxidation

The role of beam dispersion in Raman and photo-stimulated luminescence piezo-spectroscopy of yttria-stabilized zirconia in multi-layered coatings

Anisotropic TGO rumpling in EB-PVD thermal barrier coatings under in-phase thermomechanical loading

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