Characterization of ZrO2-7 wt.% Y2O3 thermal barrier coatings with different porosities and FEM analysis of stress redistribution during thermal cycling of TBCs

Funke, Claudia; Mailand, J.C; Siebert, Barbara; Vaβen, R.; Stöver, D.

doi:10.1016/s0257-8972(97)00486-6

Cited by 51 publications

(24 citation statements)

References 1 publication

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“…Studies showed that coatings produced with an increase of porosity will exhibit lower in-plane elastic modulus [75] and consequently they are expected to possess lower stresses [76]. With respect to arc spraying, phenomena concerning the splat flattening behavior and splat morphology of droplets has been examined in very few studies [64].…”

Section: Resultsmentioning

confidence: 99%

“…Studies showed that coatings produced with an increase of porosity will exhibit lower in-plane elastic modulus [75] and consequently they are expected to possess lower stresses [76]. For the impact of particles at off-normal spray angles, the particle impact velocity can be decomposed in a normal and tangential component, relative to the substrate surface [67,70], which finally affect the splat flattening behavior and the deposition efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…Studies showed that coatings produced with an increase of porosity will exhibit lower in-plane elastic modulus [75] and consequently they are expected to possess lower stresses [76]. Figure 6 shows the residual stresses determined for different sample types, depending on the substrate preheating temperature.…”

Section: Resultsmentioning

confidence: 99%

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Process Parameter Settings and Their Effect on Residual Stresses in WC/W2C Reinforced Iron-Based Arc Sprayed Coatings

2017

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Abstract:Residual stresses have been a major source of concern, as they are an inevitable consequence of manufacturing and fabrication processes. The magnitude of these stresses is often as high as, or at least, comparable to the yield strength of the material. In terms of arc sprayed coatings, the utilization of bore hole drilling methods presents some practical disadvantages as mechanical parameters (Poisson's ratio, Young's modulus) need to be identified in order to determine the residual stress distribution. Curvature techniques using Almen strips are cost-and time-effective methods that can be used for analytical quality assurance. Within the scope of this work, a quantitative study of the amount of residual stresses induced in a twin wire arc spraying (TWAS) process for a given combination of process parameters was conducted using the incremental bore hole drilling method, as well as the curvature method including Almen strips. Therefore, the effect of the primary gas pressure, substrate preheating temperature, and handling parameters, such as the spray angle and gun velocity, which influence the coating deposition as well as the heat input into the substrate, are examined. The experiments were carried out by using an iron-based cored wire with cast tungsten carbides as filling. The results of both methods are in an acceptable accordance with each other. Different stress fields were observed depending on the parameter settings.

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Section: Resultsmentioning

confidence: 99%

“…Studies showed that coatings produced with an increase of porosity will exhibit lower in-plane elastic modulus [75] and consequently they are expected to possess lower stresses [76]. For the impact of particles at off-normal spray angles, the particle impact velocity can be decomposed in a normal and tangential component, relative to the substrate surface [67,70], which finally affect the splat flattening behavior and the deposition efficiency.…”

Section: Resultsmentioning

confidence: 99%

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Process Parameter Settings and Their Effect on Residual Stresses in WC/W2C Reinforced Iron-Based Arc Sprayed Coatings

2017

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“…In addition, the biaxial in-plane compressive stresses could produce a tensile stress normal to the nominal coating plane at locations where local undulation of the interface was present. These tensile stresses, acting on the pre-existing flaws and defects, would promote crack initiation and delamination in the coating system [2,[15][16][17][18]. Finite-element analyses have shown that the stresses in a TBC increase with a growing TGO layer [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Oxidation and crack nucleation/growth in an air-plasma-sprayed thermal barrier coating with NiCrAlY bond coat

Chen

Marple

et al. 2005

Surface and Coatings Technology

168

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The oxidation behavior of an air-plasma-sprayed thermal barrier coating (APS-TBC) system was investigated in both air and low-pressure oxygen environments. It was found that mixed oxides, in the form of (Cr,Al) 2 O 3 d Ni(Cr,Al) 2 O 4 d NiO, formed heterogeneously at a very early stage during oxidation in air, and in the meantime, a layer of predominantly Al 2 O 3 grew rather uniformly along the rest of the ceramic/bond coat interface. The mixed oxides were practically absent in the TBC system when exposed in the low-pressure oxygen environment, where the TBC had a longer life. Through comparison of the microstructures of the APS-TBC exposed in air and low-pressure oxygen environment, it was concluded that the mixed oxides played a detrimental role in causing crack nucleation and growth, reducing the life of the TBC in air. The crack nucleation and growth mechanism in the air-plasma-sprayed TBC is further elucidated with emphasis on the Ni(Cr,Al) 2 O 4 and NiO particles embedded in the chromia. D

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“…1 Oxide ceramic coatings are used to improve the resistance to corrosion, heat and wear of metal components. [2][3][4][5][6] For example, mullite (3Al 2 O 3 ·2SiO 2 ) ceramic coatings are being developed as thermal control coatings and as hard and abrasion-resistant thermal barrier coatings (TBC) for application in space. 7 During the plasma spraying process, 1 solid particles are injected into a plasma jet created either by a D.C. arc or by a R.F.…”

Section: Introductionmentioning

confidence: 99%

Mullite coatings on ceramic substrates: Stabilisation of Al2O3–SiO2 suspensions for spray drying of composite granules suitable for reactive plasma spraying

Schrijnemakers

André

Lumay

et al. 2009

Journal of the European Ceramic Society

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Characterization of ZrO2-7 wt.% Y2O3 thermal barrier coatings with different porosities and FEM analysis of stress redistribution during thermal cycling of TBCs

Cited by 51 publications

References 1 publication

Process Parameter Settings and Their Effect on Residual Stresses in WC/W2C Reinforced Iron-Based Arc Sprayed Coatings

Process Parameter Settings and Their Effect on Residual Stresses in WC/W2C Reinforced Iron-Based Arc Sprayed Coatings

Oxidation and crack nucleation/growth in an air-plasma-sprayed thermal barrier coating with NiCrAlY bond coat

Mullite coatings on ceramic substrates: Stabilisation of Al2O3–SiO2 suspensions for spray drying of composite granules suitable for reactive plasma spraying

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