Damage mechanisms and lifetime behavior of plasma-sprayed thermal barrier coating systems for gas turbines — Part II: Modeling

Beck, T.; Herzog, R.; Trunova, Olena; Offermann, M; Steinbrech, R. W.; Singheiser, L.

doi:10.1016/j.surfcoat.2008.06.132

Cited by 115 publications

(46 citation statements)

References 33 publications

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“…The first is to describe the specific mechanisms leading to the failure, with the purpose of providing a reference for material upgradation [14,15]. The second is to predict lifetime to prevent accident [22][23][24]. The third is to repair a TBC with a component that has suffered localized spallation [25][26][27][28][29][30][31].…”

Section: Discussionmentioning

confidence: 99%

“…A number of previous reports were related to the damage by spallation. For example, some lifetime prediction models were developed to prevent accidents [22][23][24], and to repair TBCs on a component with localized spallation [25][26][27][28][29][30][31]. Although these reports presented in detail about how to prevent and repair TBCs in case of spallation, little attention had been drawn on evaluating thermal tolerance of the spalled coating when suffering high temperature in service.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive damage evaluation of localized spallation of thermal barrier coatings

et al. 2017

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Thermal barrier coatings (TBCs) enable the hot section part to work at high temperatures owing to their thermal barrier effect on the base metal components. However, localized spallation in the ceramic top-coat might occur after long duration of thermal exposure or thermal cycling. To comprehensively understand the damage of the top-coat on the overall hot section part, effects of diameter and tilt angle of the spallation on the temperature redistribution of the substrate and the top-coat were investigated. The results show that the spallation diameter and tilt angle both have a significant effect on the temperature redistribution of the top-coat and the substrate. In the case of the substrate, the maximum temperature increment is located at the spallation center. Meanwhile, the surface (depth) maximum temperature increment, having nothing to do with the tilt angle, increases with the increase of the spallation diameter. In contrast, in the case of the top-coat, the maximum temperature increment was located at the sharp corner of the spallation area, and the surface (depth) maximum temperature increment increases with the increase of both the spallation diameter and the tilt angle. Based on the temperature redistribution of the substrate and the top-coat affected by the partial spallation, it is possible to evaluate the damage effect of spalled areas on the thermal capability of TBCs.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comprehensive damage evaluation of localized spallation of thermal barrier coatings

et al. 2017

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“…Afterwards, up from a crack length which is determined by the roughness of the bondcoat, microcracks coalesce to macrocracks which further propagate due to 02001-p.5 stresses induced by thermal misfits and lateral TGO growth. Spallation of the TBC occurs as soon as a defined crack length is reached [7]. a) Incubation phase.…”

Section: Calculation Of Crack Lengthmentioning

confidence: 99%

“…For each time increment an average temperature was determined. Further details about this incremental calculation method are given in [7]. b) Propagation phase.…”

Section: Calculation Of Crack Lengthmentioning

confidence: 99%

“…The present paper addresses the effect of high temperature dwell time on the failure mode and lifetime of APS TBCs under thermal cycling and TMF loadings. Furthermore, the TBC life prediction model described in [7] has been improved and validated using experimental data obtained under thermal cycling with variation of the maximum and minimum temperature.…”

Section: Introductionmentioning

confidence: 99%

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TBCs for Gas Turbines under Thermomechanical Loadings: Failure Behaviour and Life Prediction

Beck

Trunova

Herzog³

et al. 2012

EPJ Web of Conferences

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Abstract. The present contribution gives an overview about recent research on a thermal barrier coating (TBC) system consisted of (i) an intermetallic MCrAlY-alloy Bondcoat (BC) applied by vacuum plasma spraying (VPS) and (ii) an Yttria Stabilised Zirconia (YSZ) top coat air plasma sprayed (APS) at Forschungszentrum Juelich, Institute of Energy and Climate Research (IEK-1). The influence of high temperature dwell time, maximum and minimum temperature on crack growth kinetics during thermal cycling of such plasma sprayed TBCs is investigated using infrared pulse thermography (IT), acoustic emission (AE) analysis and scanning electron microscopy. Thermocyclic life in terms of accumulated time at maximum temperature decreases with increasing high temperature dwell time and increases with increasing minimum temperature. AE analysis proves that crack growth mainly occurs during cooling at temperatures below the ductile-to-brittle transition temperature of the BC. Superimposed mechanical load cycles accelerate delamination crack growth and, in case of sufficiently high mechanical loadings, result in premature fatigue failure of the substrate. A life prediction model based on TGO growth kinetics and a fracture mechanics approach has been developed which accounts for the influence of maximum and minimum temperature as well as of high temperature dwell time with good accuracy in an extremely wide parameter range.

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Thermal Barrier Coatings

Vaßen

2013

Ceramics Science and Technology

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Damage mechanisms and lifetime behavior of plasma-sprayed thermal barrier coating systems for gas turbines — Part II: Modeling

Cited by 115 publications

References 33 publications

Comprehensive damage evaluation of localized spallation of thermal barrier coatings

Comprehensive damage evaluation of localized spallation of thermal barrier coatings

TBCs for Gas Turbines under Thermomechanical Loadings: Failure Behaviour and Life Prediction

Thermal Barrier Coatings

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