Effect of processing parameters on MCrAlY bondcoat roughness and lifetime of APS–TBC systems

Nowak, W.; Naumenko, D.; Mor, G.P.; Mor, F.; Mack, Daniel Emil; Vaßen, Robert; Singheiser, L.; Quadakkers, W. J.

doi:10.1016/j.surfcoat.2014.06.075

Cited by 102 publications

(48 citation statements)

References 24 publications

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“…3. TBC structure, produced by APS technique, has high porosity, oxide content and such other failures, owing to manufacture conditions which has been adopted by other researchers [25][26][27].…”

Section: As-deposited Coating Characterizationmentioning

confidence: 99%

Effect of shot peening on the oxidation behavior of thermal barrier coatings

Karaoğlanlı

Döleker

Demirel

et al. 2015

Applied Surface Science

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Section: As-deposited Coating Characterizationmentioning

confidence: 99%

Effect of shot peening on the oxidation behavior of thermal barrier coatings

Karaoğlanlı

Döleker

Demirel

et al. 2015

Applied Surface Science

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“…The analysis by contact profilometer was done under the following parameters: the traverse length (L t ) was 4 mm, linear speed of stylus (V t ) was 0.5 mm/s, and cut off length was 0.8 mm. Fractal analysis of polished and ground samples was performed on the cross-sections of as-prepared alloys in accordance with the procedure given by Nowak et al [15] using Sfrax 1.0 software [16]. The procedure of roughness analysis using fractal analysis included the following: As described in [10] based on fractal analysis the plots showing the relative length as function of scale length can be drawn.…”

Section: Methodsmentioning

confidence: 99%

Effect of Surface Roughness on Early Stage Oxidation Behavior of Ni-Base Superalloy IN 625

Nowak

2018

ASI

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Abstract:In the present work the effect of surface roughness on oxidation behavior during the early stages of high temperature exposure of Ni-base superalloy IN 625 is described. The surface roughness was described using standard contact profilometer as well as novel method, fractal analysis. It was found that the different surface preparation resulted in a difference in roughness with a parameter increase of at least one order of magnitude for the ground sample as compared with the polished sample. The oxidation test was performed in a horizontal tube furnace. Post-exposure analyses including glow discharge optical emission spectrometry (GD-OES) and scanning electron microscopy (SEM), which revealed that grinding lowers the oxidation kinetics of IN 625 from 1.76 × 10 −12 cm 2 ·s −1 , obtained for polished sample, to 9.04 × 10 −13 cm 2 ·s −1 . It was found that surface preparation influences the oxide scale composition and morphology. The hypothesis explaining the mechanism responsible for the changes in oxidation behavior is proposed as well.

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“…It is accepted that the bond coat/top coat interface morphology plays a key role in the APS TBCs lifetime [7,21]. However, it is unknown whether the interface morphology changes with the formation of significant internal oxides.…”

Section: Surface/interface Roughnessmentioning

confidence: 99%

“…Although a rough surface of the bond coat should be beneficial to the APS TBC's durability [7], these bond coats are preferred to have a dense structure to avoid the internal oxidation. The internally oxidized bond coat plays a minor role to improve the TBC's durability.…”

Section: Effect Of Internal Oxidation On Interface Crackingmentioning

confidence: 99%

“…To improve the surface roughness of the bond coat, a second rough MCrAlY layer, deposited using either APS or HVOF, was applied on the dense MCrAlY bond coat. For example, Nowak et al [7] reported that the double-layered bond coat, i.e., an inner HVOF layer and an outer APS layer, could substantially extend the lifetime of the APS TBCs, due to the more "micro-rough" surface. Nevertheless, the in-flight oxidation of MCrAlY particles during APS process could decrease the aluminum content as well as inhibit the Al outward diffusion, which may shorten the lifetime of the TBC system [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Role of internal oxidation on the failure of air plasma sprayed thermal barrier coatings with a double-layered bond coat

Zou

Jia

Yang

et al. 2017

Surface and Coatings Technology

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Failure of air plasma sprayed (APS) thermal barrier coatings (TBCs) with a double-layered bond coat was investigated. The bond coat consists of a dense layer near the substrate side and a porous layer on the surface. Both were made of NiCoCrAlY alloy and deposited using high velocity oxygen-fuel technique. After thermal cycling, a large amount of internal oxides formed (up to 45% in volume fraction), introducing a significant volume expansion both in in-plane and perpendicular direction in the bond coat. However, the presence of the ceramic top coat can suppress the bond coat in-plane swelling thus lowering the internal oxidation rate.Compared with the fully dense bond coat, the interface roughness of the porous bond coat increases significantly when internal oxidation occurs. There is a strong correlation between the internal oxidation and the interface roughness. In addition, both the beneficial and detrimental effects of internal oxidation on TBC failure were discussed. It is proposed that a fully dense bond coat with a proper surface roughness should have a longer thermal cycling

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Effect of processing parameters on MCrAlY bondcoat roughness and lifetime of APS–TBC systems

Cited by 102 publications

References 24 publications

Effect of shot peening on the oxidation behavior of thermal barrier coatings

Effect of shot peening on the oxidation behavior of thermal barrier coatings

Effect of Surface Roughness on Early Stage Oxidation Behavior of Ni-Base Superalloy IN 625

Role of internal oxidation on the failure of air plasma sprayed thermal barrier coatings with a double-layered bond coat

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