A diffusion-based oxide layer growth model using real interface roughness in thermal barrier coatings for lifetime assessment

Gupta, Mohit; Eriksson, Robert; Sand, Ulf; Nylén, Per

doi:10.1016/j.surfcoat.2014.12.043

Cited by 45 publications

(13 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Oxidation of a rough surface can lead to different oxidation products and rates depending on the curvature of the outer surface. Onset of breakaway associated with oxide micro-cracking in rough regions was also reported [63,64]. This could be attributed to non-uniform consumption of Y and Al beneath the rough surfaces and repeated-cracking/re-growth of the Al 2 O 3 scale during temperature cycling.…”

Section: Incf: Mechanisms and Kineticsmentioning

confidence: 77%

Screening for Al2O3 failure in MCrAlY APS coatings using short-term oxidation at high temperature

et al. 2021

View full text Add to dashboard Cite

The high temperature oxidation behavior of an APS processed γ-β NiCoCrAlY coating was investigated at 1150• C. Ultrathin freestanding coating specimens ranging from 16 to 240 μm in thickness were tested for short-term oxidation time (< 300 h). Intrinsic chemical failure (InCF) occurred after the full consumption of Al, and resulted in Cr 2 O 3 growth and CrN precipitation at the Al 2 O 3 /alloy interface. Mass gain slowed down after InCF, even leading to a mass loss associated with the volatilization of Cr 2 O 3 . InCF occurred after [10-20] h and [20-100] h for the ~ 21 μm and ~ 31 μm-thick specimens, respectively. Severe metal recession was observed after InCF.

show abstract

Section: Incf: Mechanisms and Kineticsmentioning

confidence: 77%

Screening for Al2O3 failure in MCrAlY APS coatings using short-term oxidation at high temperature

et al. 2021

View full text Add to dashboard Cite

show abstract

“…These random distributed defects will lead to the variation of oxygen diffusion and non-uniform TGO growth. The rough bond coat surface with convex and concave also induces a non-uniform TGO thickness layer [35,36].…”

Section: Resultsmentioning

confidence: 99%

“…However, XRD test could not identify the α-Al 2 O 3 phase (the thermodynamically stable phase above 1000°C) on the surface since the amount of Al 2 O 3 is too small. Since Al 2 O 3 is an oxygen barrier material restraining the oxygen diffusion across the coating, low TGO growth rate can be expected in Al 2 O 3 sol-gel repairing laser remelted specimens [37][38][39][40].…”

Section: Resultsmentioning

confidence: 99%

Restrained TGO growth in YSZ/NiCrAlY thermal barrier coatings by modified laser remelting

Zhao

Shahid

et al. 2017

Surface and Coatings Technology

View full text Add to dashboard Cite

Thermal barrier coatings (TBCs) are widely applied in high temperature gas turbines and jet engines to protect the superalloy components. Due to oxygen transfer through topcoat and the oxidation of bond-coat alloy, a thin layer of thermally grown oxide (TGO) will generate between the ceramic topcoat and the metallic bondcoat of TBCs after long-term operation. Cracking and spalling are often observed at the topcoat-TGO and TGO-bondcoat interfaces since the thickening of TGO layer may lead to strong tensile stress. Previously, laser remelting process has been developed as an effective way in restraining the TGO growth. In the present research, preheating laser remelting and sol-gel repairing laser remelting were respectively employed to further decelerate the TGO growth by reducing the number density and average size of vertical cracks in the topcoat. After 100h isothermal oxidation, the TGO growth rate of the modified laser remelted specimens are much lower than the conventional laser remelted specimens, which shows the potentiality of preheating and sol-gel repairing as effective promotions of laser remelting process in restraining the TGO growth.

show abstract

“…Surface roughness of the substrate has a great influence on the adhesion of thermally sprayed coatings and therefore on their lifetime [21][22][23], corrosion resistance of many materials [16,24], in diffusion bonding [25] and tribological behavior of the surfaces [22,26]. Accuracy in evaluation of surface roughness and its topography is of great importance in those applications.…”

Section: Surface Roughness Evaluationmentioning

confidence: 99%

“Mechanically prepared copper surface in oxidizing and non-oxidizing conditions”

Serafin

Nowak

Wierzba

2019

Applied Surface Science

View full text Add to dashboard Cite

In the present work surface roughness of copper samples after mechanical surface preparation processes (polishing, grinding, sand-blasting) and after exposure in non-oxidizing (high purity argon) and oxidizing (air) conditions at 700 and 750°C have been evaluated by contact profilometer and by fractal analysis. Quantitative description of surfaces that are hidden from the sight of conventional methods is possible by fractal analysis, e.g. in the present work, the roughness of Cu 2 O/Cu boundary has been evaluated under oxide layer. It has been pointed out, that in both oxidizing and non-oxidizing conditions initial surface roughness of copper is affected by annealing at high temperature: at 700°C surface roughness of polished and ground samples increased but at 750°C decreased in comparison to surface roughness prior to heat treatment. For sand-blasted samples in both oxidizing and non-oxidizing conditions the lowest values of surface roughness parameters were obtained at 750°C. It is then concluded that two phenomena are responsible for such effect: chemical reaction between copper and oxygen and surface diffusion of copper due to high temperature of annealing.

show abstract

A diffusion-based oxide layer growth model using real interface roughness in thermal barrier coatings for lifetime assessment

Cited by 45 publications

References 35 publications

Screening for Al2O3 failure in MCrAlY APS coatings using short-term oxidation at high temperature

Screening for Al2O3 failure in MCrAlY APS coatings using short-term oxidation at high temperature

Restrained TGO growth in YSZ/NiCrAlY thermal barrier coatings by modified laser remelting

“Mechanically prepared copper surface in oxidizing and non-oxidizing conditions”

Contact Info

Product

Resources

About