Studies of the bond-coat oxidation and phase structure of TBCs

Czech, N.; Fietzek, H.; Juez‐Lorenzo, M.; Kolarik, V.; Werner, Stefan

doi:10.1016/s0257-8972(98)00835-4

Cited by 45 publications

(12 citation statements)

References 14 publications

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“…[16] Therefore, EB-PVD is the process of choice as far as TBCs for high pressure turbine blades for aeroengines is concerned, and becomes increasingly important also for turbine blades of land-based industrial gas turbines for power generation. [15,17,18] During EB-PVD processing a high energy electron beam melts and evaporates a ceramic source ingot in a vacuum chamber. During evaporation the ingots are bottom-fed into the crucibles to ensure continuous growth of the ceramic coating.…”

Section: Competing Technologies For Thermal Barrier Coatings Depositionmentioning

confidence: 99%

EB-PVD Thermal Barrier Coatings for Aeroengines and Gas Turbines

Peters,

Leyens,

Schulz

et al. 2001

Adv. Eng. Mater.

162

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Section: Competing Technologies For Thermal Barrier Coatings Depositionmentioning

confidence: 99%

EB-PVD Thermal Barrier Coatings for Aeroengines and Gas Turbines

Peters,

Leyens,

Schulz

et al. 2001

Adv. Eng. Mater.

162

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“…Failure of a TBC system is often associated with oxidation of the metallic bond coat at elevated temperatures via formation of a thermally grown oxide (TGO) layer by depletion of aluminum from the bond coat [2][3][4][5][6][7][8]. In past work, it was observed that plasmasprayed TBCs failed by spallation of the ceramic coat near the original ceramic/bond coat interface but mostly within the ceramic layer [9][10][11][12], whereas EB-PVD-produced TBCs failed at the interface between the TGO and the bond coat [13,14].…”

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

166

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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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“…[21][22][23][24][25][26][27][28] Figure 9 summarizes the relationship between the thickness of the TGO layer and the total net heating time at the maximum temperature of thermal cycle tests in the present study and that in the literatures. The coatings and thermal cycle testing conditions are shown in Table 1.…”

Section: Thermal Cycle Resistance Of Yttria Stabilized Zirconia Coatimentioning

confidence: 99%

Thermal Cycle Resistance of Yttria Stabilized Zirconia Coatings Prepared by MO-CVD

Goto

2005

Mater. Trans.

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Yttria stabilized zirconia (YSZ) coatings containing 0 to 9.5 mol% Y 2 O 3 were prepared on Hastelloy-XR alloys by metal-organic chemical vapor deposition (MO-CVD), and the effect of Y 2 O 3 content on thermal cycle resistance was investigated in the temperature intervals from 600 to 1273 K and from 600 to 1373 K in air. In the 600-1273 K interval, delamination after 1200 cycles had not occurred for any of the Y 2 O 3 contents of YSZ coatings. In the 600-1373 K interval, the YSZ coatings containing 0, 0.5 and 9.5 mol% Y 2 O 3 suffered partial delamination after 1200 cycles, while no delamination was observed for the YSZ coatings containing 4 mol% Y 2 O 3 . During the thermal cycles, thermally grown oxide (TGO) layers consisting of inner Cr 2 O 3 and outer (Ni,Mn,Fe)(Fe,Cr) 2 O 4 spinel were formed at the YSZ coating/Hastelloy-XR substrate alloy interface. The delamination of YSZ coatings occurred at the alloy side near the TGO layer/Hastelloy-XR alloy interface.

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Studies of the bond-coat oxidation and phase structure of TBCs

Cited by 45 publications

References 14 publications

EB-PVD Thermal Barrier Coatings for Aeroengines and Gas Turbines

EB-PVD Thermal Barrier Coatings for Aeroengines and Gas Turbines

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

Thermal Cycle Resistance of Yttria Stabilized Zirconia Coatings Prepared by MO-CVD

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