Microstructure degradation of EB-PVD TBCs on Pd–Pt-modified aluminide coatings under cyclic oxidation conditions

Swadźba, Radosław; Wiedermann, J.; Hetmańczyk, M.; Swadźba, L.; Mendala, B.; Witala, B.; Komendera, Łukasz

doi:10.1016/j.surfcoat.2013.09.022

Cited by 16 publications

(15 citation statements)

References 36 publications

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“…For instance, our previous study [23] found Zr and Y on the grain boundaries of alumina TGO grown in TBC system (N5 superalloy with Pd-Ptaluminide bond coating and 7 wt% YSZ top coating) that can lead to argument whether these elements originate from the substrate alloy or the YSZ top coat. The dynamic segregation theory (DST) [16] and the results presented in this work indicate that Zr as well as Y readily diffuses through the grain boundaries of alumina grown on bare superalloy even at very low concentrations.…”

Section: Reactive Element Effectmentioning

confidence: 99%

“…For instance, a recent work conducted by Heuer et al [21] stated that REs affect the oxidation behavior not by ''site blocking'' at grain boundaries but by reducing Al ionization and vacancy injection into the scale. In addition to Hf, Zr and Y [22][23][24][25] other elements are also commonly found on the grain boundaries of growing alumina scales, such as Ti [22,26], Ta [26] and La [27].…”

Section: Introductionmentioning

confidence: 99%

“…While the oxidation of modified aluminide bond coatings has been studied in detail by now, during the recent years some interest has been devoted to Pd ? Pt [23,30,31] modified aluminide coatings that provide excellent oxidation resistance and can be considered as bond coatings for TBC systems. Although bare superalloys are rarely applied on components operating at high temperatures it is important to study their behavior under such conditions in order to evaluate the influence of novel coatings further on.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of Alumina Scales Grown on a 2nd Generation Single Crystal Ni Superalloy During Isothermal Oxidation at 1050, 1100 and 1150 °C

Swadźba

Wiedermann

et al. 2014

Oxid Met

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This paper concerns microstructural characterization of alumina scales formed on a 2nd generation single crystal Ni superalloy during isothermal oxidation in dry oxygen at 1050, 1100 and 1150°C for 100 h. Samples for high resolution characterization of Al 2 O 3 scales were prepared using a focused ion beam (FIB) method. High resolution TEM and S/TEM techniques were used for a detailed characterization and a direct comparison of the phase composition and chemistry of the oxide scales formed during high temperature oxidation. The growth of transient h-Al 2 O 3 and its transformation to a-alumina is addressed for each oxidation temperature along with the differences in the diffusion of reactive elements, such as Hf, Zr and Y, through grain boundaries of the a phase. The h to a transformation front was proven to move from the metal-scale to the scale-gas interface. The results presented in this paper indicate that after 100 h of oxidation at 1050 and 1100°C there are still some h-alumina grains remaining and even in the regions where the transformation to a was finished the surface retained the whisker-like morphology.

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Section: Reactive Element Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of Alumina Scales Grown on a 2nd Generation Single Crystal Ni Superalloy During Isothermal Oxidation at 1050, 1100 and 1150 °C

Swadźba

Wiedermann

et al. 2014

Oxid Met

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“…Hf, Zr and Y. There are a number of research works proving the positive influence of reactive elements on high temperature oxidation processes [2][3][4], however the exact mechanism of their influence is still unclear. There is experimental evidence indicating that the presence of Hf, Y and Zr has a particularly positive effect on the oxidation processes of alloys that form oxide scales composed of Al 2 O 3 or Cr 2 O 3 , which leads to [4][5][6][7][8]:…”

Section: Introductionmentioning

confidence: 99%

INFLUENCE OF HAFNIUM ON HIGH TEMPERATURE OXIDATION OF NiAl AND Ni3Al ALLOYS

Swadźba¹,

Staszica²

2018

PIMZ

Self Cite

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The results presented in this paper concern the modification of NiAl and Ni 3 Al alloys with reactive elements that increase their high temperature oxidation resistance. Literature data indicate that even trace additions of Hf to aluminide coatings significantly improve the resistance to oxidation in the range of 1100-1150°C, however the exact mechanism of its influence is not yet known. In order to determine the influence of various additions of Hf on high temperature oxidation of aluminide coatings, cyclic oxidation tests were performed at 1150°C of model NiAl and Ni 3 Al alloys with different Hf additions-from 0.25 wt.% to 1.5 wt.%. High resolution electron microscopy, as well as chemical composition analysis techniques, were applied to perform a detailed characterisation of the influence of Hf on the substructure, chemical and phase composition in the nano scale of oxide scales formed during high temperature oxidation.

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“…Increase in TGO thickness alone does not lead directly to buckling spallation [27,28]. The origin of surface undulations is attributed to a wide range of phenomena occurring during thermal cycling that include thermal expansion mismatch between the aluminide bond coat and the underlying superalloy, the martensitic transformation ((Ni, Pt)Al bond coatings in particular), initial surface roughness and creep strength of the bond coat as well as stresses that arise during lateral growth of the TGO [29]. The current understanding of the failure modebased on experimental and analytical studies-shows that there are several essential conditions that together cause the development of the morphological features [13,16,20].…”

Section: Thermal Cycling Behavior Of Tbcsmentioning

confidence: 99%

Thermal cycling behavior of EB-PVD TBCs on CVD platinum modified aluminide coatings

Wang

Huang

et al. 2015

Journal of Alloys and Compounds

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Microstructure degradation of EB-PVD TBCs on Pd–Pt-modified aluminide coatings under cyclic oxidation conditions

Cited by 16 publications

References 36 publications

Characterization of Alumina Scales Grown on a 2nd Generation Single Crystal Ni Superalloy During Isothermal Oxidation at 1050, 1100 and 1150 °C

Characterization of Alumina Scales Grown on a 2nd Generation Single Crystal Ni Superalloy During Isothermal Oxidation at 1050, 1100 and 1150 °C

INFLUENCE OF HAFNIUM ON HIGH TEMPERATURE OXIDATION OF NiAl AND Ni3Al ALLOYS

Thermal cycling behavior of EB-PVD TBCs on CVD platinum modified aluminide coatings

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