Microstructural examination of <scp>TGO</scp> formed during pre‐oxidation on Pt‐aluminized Ni‐based superalloy

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

doi:10.1002/maco.201307231

Cited by 13 publications

(9 citation statements)

References 49 publications

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“…cationic diffusion and vacancy coalescence during the initial stages of oxidation interfacial voids can form compromising the adhesion of the protective scale and leading to its premature spallation [6,[11][12][13]. In addition, free surfaces of such voids can serve as segregation sites for indigenous sulfur also weakening the adhesion of oxide scale and promoting void formation [14,15].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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 is thought to occur via de-lamination of the alumina scale, assisted by void formation at TiO 2 particles forming at the oxide/metal interface. Other recent investigations of the resistance of these coatings to high temperature thermal exposure [25,26] have consistently observed rutile growth on plain aluminide coatings. Shirvani et al [26] observed TiO 2 rutile formation upon plain aluminide coated CMSX-4 but not upon Pt-aluminide coated sample after cyclic oxidation.…”

mentioning

confidence: 72%

On the oxidation behavior of titanium within coated nickel-based superalloys

et al. 2015

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Rutile precipitation within alumina scales grown on coated nickel based superalloy CMSX-4 has been found to occur preferentially at grain boundaries within the scale. Misorientation analysis using Rodrigues-Frank space has revealed clustering of the misorientation between neighbouring grains of corundum and rutile about the established <0001> C {11 2 ̅ 0} C // <010> R {101} R orientation relationship observed in Ti-containing sapphire crystals. The fraction of interfaces found to exist in this configuration is sufficient to explain the nucleation of rutile from a single corundum grain abutting the rutile grain. The diffusive behaviour of Ti has been observed to vary considerably within three commercially used coatings, a plain aluminide coating, a plat-aluminide coating and a diffused platinum coating. Titanium diffusion is enhanced by the presence of Pt. However this did not lead to the precipitation of more rutile, which although observed in all three coatings, was present in sufficient quantity to be detected using XRD only within the plain aluminide coated samples.

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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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Microstructural examination of TGO formed during pre‐oxidation on Pt‐aluminized Ni‐based superalloy

Cited by 13 publications

References 49 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

On the oxidation behavior of titanium within coated nickel-based superalloys

Revestimentos para barreira térmica: evolução e perspectivas

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