Assessment of TBC systems failure mechanisms using a fracture mechanics approach

Aktaa, Jarir; Sfar, Kais; Münz, D.

doi:10.1016/j.actamat.2005.06.003

Cited by 158 publications

(35 citation statements)

References 18 publications

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“…[5][6][7][8][9] A TBC failure mechanism that is common to EBPVD TBCs on heavy grit-blasted platinum-modified aluminides involves rumpling or ratcheting of the coating and the TGO. As discussed by Spitzberg et al [7] during thermal cycling, the TGO undergoes displacement instability with periodic penetrations of the TGO into the bond coat.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Failures during Cyclic Oxidation of Yttria-Stabilized (7 to 8 Weight Percent) Zirconia Thermal Barrier Coatings Fabricated via Electron Beam Physical Vapor Deposition and Air Plasma Spray

Yanar

Helminiak

Meier

et al. 2010

Metall Mater Trans A

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The failures during oxidation of electron beam physical vapor deposition (EBPVD) and air plasma spray (APS) yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) on different bond coats, namely, platinum-modified aluminide and NiCoCrAlY, are described. It is shown that oxidation of the bond coats, along with defects existing near the TBC/bond coat interface, plays a very important role in TBC failures. Procedures to improve TBC performance via modifying the oxidation characteristics of the bond coats and removing the as-processed defects are discussed. The influence of exposure conditions on TBC lives is described and factors such as cycle frequency and thermal gradients are discussed.

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Section: Introductionmentioning

confidence: 99%

Comparison of the Failures during Cyclic Oxidation of Yttria-Stabilized (7 to 8 Weight Percent) Zirconia Thermal Barrier Coatings Fabricated via Electron Beam Physical Vapor Deposition and Air Plasma Spray

Yanar

Helminiak

Meier

et al. 2010

Metall Mater Trans A

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“…To this end, we will focus on the stresses that indentation force (left column) and the residual stress fields after develop during the indentation, including the residual stress field unloading (right column). 3 Three cases are considered: ranging from after unloading. low to large maximum indentation force: 100, 200, and 500 N, We will first consider the case of a homogeneous top coat.…”

Section: Resultsmentioning

confidence: 99%

“…Based on previous observations, e.g., Refs. [1][2][3][4], it was expected that the heat treated (aged) samples should exhibit lower interfa cial toughness than the as-coated and that the delamination size would increase with increasing maximum indentation load. How ever, the results indicated otherwise.…”

Section: Introductionmentioning

confidence: 99%

On stresses induced in a thermal barrier coating due to indentation testing

Jin

Karlsson

Bartsch

et al. 2009

Computational Materials Science

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“…The material properties listed in Table 1 are temperature dependent ( Ref 1,4,7,8). Note that the yield strength r y represents the threshold stress beyond which microcracks begin to form.…”

Section: Materials Behavior and Propertiesmentioning

confidence: 99%

Effect of Residual Stresses and Prediction of Possible Failure Mechanisms on Thermal Barrier Coating System by Finite Element Method

et al. 2010

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This work is focused on the effect of the residual stresses resulting from the coating process and thermal cycling on the failure mechanisms within the thermal barrier coating (TBC) system. To reach this objective, we studied the effect of the substrate preheating and cooling rate on the coating process conditions. A new thermomechanical finite element model (FEM) considering a nonhomogeneous temperature distribution has been developed. In the results, we observed a critical stress corresponding to a low substrate temperature and high cooling rate during spraying of the top-coat material. Moreover, the analysis of the stress distribution after service shows that more critical stresses are obtained in the case where residual stresses are taken into account.

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Assessment of TBC systems failure mechanisms using a fracture mechanics approach

Cited by 158 publications

References 18 publications

Comparison of the Failures during Cyclic Oxidation of Yttria-Stabilized (7 to 8 Weight Percent) Zirconia Thermal Barrier Coatings Fabricated via Electron Beam Physical Vapor Deposition and Air Plasma Spray

Comparison of the Failures during Cyclic Oxidation of Yttria-Stabilized (7 to 8 Weight Percent) Zirconia Thermal Barrier Coatings Fabricated via Electron Beam Physical Vapor Deposition and Air Plasma Spray

On stresses induced in a thermal barrier coating due to indentation testing

Effect of Residual Stresses and Prediction of Possible Failure Mechanisms on Thermal Barrier Coating System by Finite Element Method

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