Failure modes in plasma-sprayed thermal barrier coatings

Schlichting, Kevin; Padture, Nitin P.; Jordan, Eric H.; Gell, Maurice

doi:10.1016/s0921-5093(02)00251-4

Cited by 374 publications

(160 citation statements)

References 23 publications

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“…These results show that the values of 20 µm for APS-YSZ and 100 µm for EBPVD-YSZ previously reported are over-optimistic [51], [52] and [53] for these materials.…”

Section: Technological Importance Of the Sampling Volumesupporting

confidence: 49%

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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“…These results show that the values of 20 µm for APS-YSZ and 100 µm for EBPVD-YSZ previously reported are over-optimistic [51], [52] and [53] for these materials.…”

Section: Technological Importance Of the Sampling Volumesupporting

confidence: 49%

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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“…The homogenous distribution of the MoSi 2 particles in the YSZ sample created and analysed here provides an upper boundary for the actual loss in thermal protection for the envisaged TBC systems, which will only contain MoSi 2 particles close to the interface with the TGO, as this is the region in which the lateral cracking is found to occur [3]. Certainly there is no need to insert MoSi 2 particles in regions of the TBC where cracking does not lead to spallation of TBC.…”

Section: Introductionmentioning

confidence: 95%

“…The coated systems experience high stresses that develop due to the thermal expansion coefficients mismatch between the metal substrate and the ceramic TBC. Upon a sufficient number of cycles these stresses may result in the development of microcrack patterns in the TBC that coalesce and ultimately lead to failure of the topcoat and its adhesion promoting thermally grown oxide (TGO) layer [1][2][3][4]. For TBC systems manufactured by APS failure is known to occur within the porous YSZ top coat close to the TGO layer [3].…”

Section: Introductionmentioning

confidence: 99%

“…Upon a sufficient number of cycles these stresses may result in the development of microcrack patterns in the TBC that coalesce and ultimately lead to failure of the topcoat and its adhesion promoting thermally grown oxide (TGO) layer [1][2][3][4]. For TBC systems manufactured by APS failure is known to occur within the porous YSZ top coat close to the TGO layer [3]. Therefore, it has been proposed to embed 'healing' particles inside the YSZ top coat, which when intersected by a crack initiate a chemical reaction resulting in filling the microcracks with a well-adhering load bearing substance [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Influence of embedded MoSi2 particles on the high temperature thermal conductivity of SPS produced yttria-stabilised zirconia model thermal barrier coatings

Kulczyk-Malecka

Zhang

Carr

et al. 2016

Surface and Coatings Technology

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Influence of embedded MoSi 2 particles on the high temperature thermal conductivity of SPS produced yttria-stabilised zirconia model thermal barrier coatings, Surface & Coatings Technology (2016), doi:10.1016/j.surfcoat.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D Abstract:To prolong the lifetime of thermal barrier coatings (TBCs) recently a new method of microcrack healing has been developed, which relies on damage initiated thermal decomposition of embedded molybdenum disilicide (MoSi 2 ) particles within the TBC matrix.While these MoSi 2 particles have a beneficial effect on the structural stability of the TBC, the high thermal conductivity of MoSi 2 may have an unfavourable but as yet unquantified impact on the thermal conductivity of the TBCs.In this work the thermal conductivity of spark plasma sintering (SPS) produced yttria-

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“…This layer acts as a diffusion barrier during the extended thermal exposure in service, thus protecting the substrate from further oxidation. However, growth of the TGO tends to increase the internal stress within the TBC system and causes cracking in the TC/BC interfacial region, which eventually leads to spallation of the topcoat (Ref [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

The Oxidation Behavior of TBC with Cold Spray CoNiCrAlY Bond Coat

Chen

Irissou²,

et al. 2010

J Therm Spray Tech

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Cold gas dynamic spray (CGDS) has been considered a potential technique to produce the metallic bond coat for TBC applications, because of its fast deposition rate and low deposition temperature. This article presents the influence of spray processes for bond coat, including air plasma spray, high velocity oxy-fuel, and in particular CGDS, on the oxidation performance of TBCs with a Co-32Ni-21Cr-8Al-0.5Y (wt.%) bond coat and an air plasma sprayed topcoat. Oxidation behavior of the TBCs was evaluated by examining the coating microstructural evolution, TGO growth behavior, and crack propagation during thermal exposure at 1050°C. The relationship between the TGO growth and crack propagation will be discussed.

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Failure modes in plasma-sprayed thermal barrier coatings

Cited by 374 publications

References 23 publications

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

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

Influence of embedded MoSi2 particles on the high temperature thermal conductivity of SPS produced yttria-stabilised zirconia model thermal barrier coatings

The Oxidation Behavior of TBC with Cold Spray CoNiCrAlY Bond Coat

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