Assessment of Cyclic Lifetime of NiCoCrAlY/ZrO2-Based EB-PVD TBC Systems via Reactive Element Enrichment in the Mixed Zone of the TGO Scale

Fritscher, K.; Braue, W.; Schulz, Uwe

doi:10.1007/s11661-012-1561-2

Cited by 9 publications

(13 citation statements)

References 44 publications

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“…As stated by Fig. 1 the life is hardly affected by the CTE misfit ratio [5]. The EBPVD TBC variants showing the highest CTE misfit mismatch demonstrate the longest life.…”

Section: Introductionmentioning

confidence: 66%

“…A square root relationship was encountered for the Y + Zr content in the MZ versus the relative lifetime of Ni base YSZ EBPVD TBC systems; yet it could not be interpreted [4]. A similar, but "super-parabolic" relationship between relative life of CeSZ top-coated TBC systems on same Ni-base substrates and the accumulated Ce + Y + Zr content in the MZ has been reported [5]. This previous work and in particular the disparity in the accumulation rates of elements in the MZ are used in the following to evaluate the mechanisms which rule both the accumulation kinetics and failure modes of Ni-base alloys on the life of EBPVD TBC systems.…”

Section: Introductionmentioning

confidence: 88%

“…The MZ discloses its central role: the content of the accumulated elements in the MZ is indicative of the service life. The key elements for YSZ top-coated systems are Y and Zr [4], for CeSZ top-coated systems the elements Ce, Y and Zr [5]. Their content in the MZ is a characteristic measure of the stage of life [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Life and FCT Failure of Yttria- and Ceria-Stabilized EBPVD TBC Systems on Ni-Base Substrates

Fritscher

2018

Oxid Met

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The lifetime at 1100°C of furnace oxidation tested TBC samples having YSZ (ZrO 2-7 wt% Y 2 O 3) and CeSZ (ZrO 2-25 wt% CeO 2-2.5 wt% Y 2 O 3) topcoats on four Ni base alloys including a no-bond coat NiCrAl alloy were studied. The thermally grown oxide (TGO) was investigated by energy dispersive spectroscopy. The outer zone of the TGO revealed preferred enrichment of Zr and of rare earth elements Ce and Y in dependence of the stage of life. The oxygen potential gradients in the TGO have been rated; they are stronger for the YSZ TBC systems than for the CeSZ systems and cause a more intensive interaction of the outer zone alias mixed zone with the metal substrate than with the ceramic topcoat. When comparing the chemical composition data of the mixed zone as a function of the test period, the average lifetime as well as the particular composition of the two topcoats and the refractory element content of the substrates allowed conclusions to be drawn about the mechanisms which influence the lifetime.

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“…As stated by Fig. 1 the life is hardly affected by the CTE misfit ratio [5]. The EBPVD TBC variants showing the highest CTE misfit mismatch demonstrate the longest life.…”

Section: Introductionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 88%

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Life and FCT Failure of Yttria- and Ceria-Stabilized EBPVD TBC Systems on Ni-Base Substrates

Fritscher

2018

Oxid Met

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“…Similar failure times (not shown) were reported for CMSX-4, TMS 138A, and TMS 82, substrates, which were all measurably higher than those for SRR99 substrates. Other substrates, tested at 1100°C and 1150°C, include Rene′142, IN100, and AM1 (as reported by Lau, Schulz, SaintRamond, and co-workers) [38,[44][45][46]. While these alloys are not single crystals, they exhibited lives comparable to the overall population.…”

Section: Temperature Effects Of Compiled Fct Livesmentioning

confidence: 94%

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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“…Como a oxidação da camada de ligação, típica dos TBC's em serviço, afeta especialmente a vida dos revestimentos, causando sua delaminação, diversos estudos vêm sendo atualmente efetuados nesta linha, buscando maior entendimento do processo em si e da variação ocasionada por este processo nas tensões e morfologia da interface [35,[58][59][60][61][62][63][64].…”

Section: Oxidação Em Alta Temperatura E Outros Fatores Adicionaisunclassified

Revestimentos para barreira térmica: evolução e perspectivas

Lima

2014

Soldag. insp.

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Resumo Palavras-chave: Revestimento para barreira térmica; TBC; Aspersão térmica; Metal-cerâmica. Abstract: For over four decades, thermal barrier coatings, or simply TBC, have been decisive for the performance of gas turbines in aviation and aerospace, and more recently also in the performance of power generation turbines and diesel engines. Its importance overlaps the developments achieved in the area

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Assessment of Cyclic Lifetime of NiCoCrAlY/ZrO2-Based EB-PVD TBC Systems via Reactive Element Enrichment in the Mixed Zone of the TGO Scale

Cited by 9 publications

References 44 publications

Life and FCT Failure of Yttria- and Ceria-Stabilized EBPVD TBC Systems on Ni-Base Substrates

Life and FCT Failure of Yttria- and Ceria-Stabilized EBPVD TBC Systems on Ni-Base Substrates

Compiled furnace cyclic lives of EB-PVD thermal barrier coatings

Revestimentos para barreira térmica: evolução e perspectivas

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