Effect of temperature on rumpling and thermally grown oxide stress in an EB-PVD thermal barrier coating

Wen, Mei; Jordan, Eric H.; Gell, Maurice

doi:10.1016/j.surfcoat.2006.07.212

Cited by 40 publications

(28 citation statements)

References 35 publications

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“…The variation in life spans an order of magnitude at 1150°C, the most common test temperature. However, taking the population as a whole, the strong temperature dependence can still be surmised from the slope here as a life reduction of~90% for every 100°C increase in temperature, as originally identified independently by many studies [10,32,39,40]. Bulk doped NiAl(Hf,Zr) typically exhibited failure lives about 10× those reported for coatings.…”

Section: Eb-pvd Tbc Fct Life On Alumina-forming Systemsmentioning

confidence: 52%

“…Here the studies from the University of Connecticut (Profs. Jordan and Gell) can be discussed as a similar grouping (horizontally split blue/red diamond) [39][40][41] (Sridharan, Wen, Xie et al). These help extend the trend-line to lower temperatures, but with one study [40] showing lives about ½ the others.…”

Section: Temperature Effects Of Compiled Fct Livesmentioning

confidence: 99%

“…Jordan and Gell) can be discussed as a similar grouping (horizontally split blue/red diamond) [39][40][41] (Sridharan, Wen, Xie et al). These help extend the trend-line to lower temperatures, but with one study [40] showing lives about ½ the others. Two studies showed a life increase of 30-40% at 1150°C and 1121°C by not grit blasting [12,41].…”

Section: Temperature Effects Of Compiled Fct Livesmentioning

confidence: 99%

“…The median behavior of the Pt-modified aluminide and Pt-only coatings shown by the dashed regression fitted line produced a slope closer to a 7.5× reduction for every 100°C. That is because different studies, with offset lives representing different populations, dominate the low (Kimmel, Wen et al) and high temperature (Wu) extremes [30,40,43].…”

Section: Arrhenius Behavior Of Fct Lifementioning

confidence: 99%

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Compiled furnace cyclic lives of EB-PVD thermal barrier coatings

Smialek

2015

Surface and Coatings Technology

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a b s t r a c t a r t i c l e i n f oFurnace cycling has been widely used to study the failure of EB-PVD thermal barrier coatings. This contribution compiles TBC furnace cyclic lives over a broad literature base to highlight optimum systems and generalized trends not always apparent in one study. Systems included typical bond coats (Pt-modified aluminides, diffused Pt-only γ/γ′, and NiCoCrAlY (± Pt, Hf) overlays) and superalloy substrates (1st, 2nd, 3rd generation single crystals, directionally solidified, or conventionally cast). Pretreatments included controlled low p(O 2 ) bond coat pre-oxidation and grit blasting (or none). The aggregate lives (~70) suggest a general trend with temperature,~10-fold decrease for every 100°C increase. Measured alumina scale thicknesses (~30) were, on average, 6.1 ± 1.8 μm at failure and independent of temperature for conventional systems. Most failures thus occurred in less time than that predicted to grow 7 μm of alumina scale (as estimated from separate TGA studies of a Ptmodified aluminide coated 2nd generation single crystal superalloy). A tentative activation energy indicated from the broad distribution of failure times was~280 kJ/mol, while that from homogeneous TGA testing was 380 kJ/mol, with regression coefficients of r 2 = 0.57 and 0.98, respectively. Published by Elsevier B.V.

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Section: Eb-pvd Tbc Fct Life On Alumina-forming Systemsmentioning

confidence: 52%

Section: Temperature Effects Of Compiled Fct Livesmentioning

confidence: 99%

Section: Temperature Effects Of Compiled Fct Livesmentioning

confidence: 99%

Section: Arrhenius Behavior Of Fct Lifementioning

confidence: 99%

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Compiled furnace cyclic lives of EB-PVD thermal barrier coatings

Smialek

2015

Surface and Coatings Technology

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“…Many studies have shown that damage initiation for some failure modes occurs at this bond coat/TGO/TBC interface [2][3][4][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] . The strain behaviour of the layers at high temperature is largely related to the thermal gradient across the coating due to internal cooling of the turbine blade and mechanical loads from centrifugal forces in combination with the temperature-dependent thermal and mechanical properties of the coating.…”

mentioning

confidence: 99%

Strain response of thermal barrier coatings captured under extreme engine environments through synchrotron X-ray diffraction

et al. 2014

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The mechanical behaviour of thermal barrier coatings in operation holds the key to understanding durability of jet engine turbine blades. Here we report the results from experiments that monitor strains in the layers of a coating subjected to thermal gradients and mechanical loads representing extreme engine environments. Hollow cylindrical specimens, with electron beam physical vapour deposited coatings, were tested with internal cooling and external heating under various controlled conditions. High-energy synchrotron X-ray measurements captured the in situ strain response through the depth of each layer, revealing the link between these conditions and the evolution of local strains. Results of this study demonstrate that variations in these conditions create corresponding trends in depth-resolved strains with the largest effects displayed at or near the interface with the bond coat. With larger temperature drops across the coating, significant strain gradients are seen, which can contribute to failure modes occurring within the layer adjacent to the interface.

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Moisture-Induced Delayed Alumina Scale Spallation on a Ni(Pt)Al Coating

Smialek

2009

Oxid Met

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Effect of temperature on rumpling and thermally grown oxide stress in an EB-PVD thermal barrier coating

Cited by 40 publications

References 35 publications

Compiled furnace cyclic lives of EB-PVD thermal barrier coatings

Compiled furnace cyclic lives of EB-PVD thermal barrier coatings

Strain response of thermal barrier coatings captured under extreme engine environments through synchrotron X-ray diffraction

Moisture-Induced Delayed Alumina Scale Spallation on a Ni(Pt)Al Coating

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