Comparative study on oxidation behavior of selected MCrAlY coatings by elemental concentration profile analysis

Seo, Do Won; Ogawa, Kōichi; Suzuki, Yuta; Ichimura, Kenji; Shoji, Tetsuo; Murata, Shozo

doi:10.1016/j.apsusc.2008.07.141

Cited by 46 publications

(13 citation statements)

References 12 publications

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“…11a) formed on the surface. According to the TGO morphology ( Ref 25,33), image contrast taken in the BEI (SEM) mode and the EDS elements mapping results on the cross-section (Fig. 11b) of the oxidized coating, it was considered that the porous oxides is spinel.…”

Section: Features Of Tgosmentioning

confidence: 99%

Effect of Chemical Compositions and Surface Morphologies of MCrAlY Coating on Its Isothermal Oxidation Behavior

Zhang

et al. 2010

J Therm Spray Tech

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Chemical composition and surface morphology of MCrAlY coatings are factors which influence the oxidation behavior and the thermal durability of thermal barrier coatings. In this study, Cold-sprayed Ni20Cr10AlY and Ni23Co20Cr8.5Al4.0Ta0.6Y coatings with polished surfaces were employed to study the effect of composition on the oxidation behavior. The cold-sprayed MCrAlY coatings at the as-sprayed and shot-peened surface conditions, along with the low pressure plasma-sprayed MCrAlY coating with sputters adhered weakly on the surface, were employed to investigate the effects of surface morphologies of MCrAlY coatings on their oxidation behavior. Cold-sprayed Ni20Cr10AlY coating exhibited a two-stage oxidation behavior and a higher TGO growth rate than that of the cold-sprayed Ni23Co20Cr8.5Al4.0Ta0.6Y coating at the rapid growth stage. After 10-h oxidation, the TGO on the as-cold-sprayed coating surface was mainly constituted by Al 2 O 3 , while the TGO on the coating surface attached with sputters was composed of Al 2 O 3 and Cr/Ni-oxides. After 500-h oxidation, Cr 2 O 3 and porous spinel appeared in the TGO on the surface of the as-cold-sprayed coatings with different compositions. The growth of Cr/Ni-oxides was attributed to the Al depletion. The content of spinel decreased on the cold-sprayed NiCrAlY with a shot-peened surface compared with the as-sprayed coating.

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Section: Features Of Tgosmentioning

confidence: 99%

Effect of Chemical Compositions and Surface Morphologies of MCrAlY Coating on Its Isothermal Oxidation Behavior

Zhang

et al. 2010

J Therm Spray Tech

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“…Previous reports have been focused on oxidation effects (e.g., weight gain, lifetime under furnace cycling tests) as well as oxide scales and bond coat characteristics [14,[22][23][24]. Moreover, few investigations have been conducted to understand the interplay of Ta with Ti, Hf, Re, among other elements from the used superalloys, and the way it affects the microstructure and diffusion phenomena between the bond coat and the substrate, especially at their interface [25][26][27]. In this contribution, the effect of the chemical composition of IN100, CMSX-4 and M247LC SX superalloys on the microstructural and chemical evolution of a NiCoCrAlYTa BC through different processing stages and thermal cycling tests is presented and discussed.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and lifetime of Hf or Zr doped sputtered NiAlCr bond coat/7YSZ EB-PVD TBC systems

Muñoz-Saldaña

Schulz

Rodríguez

et al. 2018

Surface and Coatings Technology

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The microstructural and chemical evolution after different processing steps of Ta-containing NiCoCrAlY bond coats (BC) sprayed by high velocity oxy-fuel on Ni-base superalloy (SA) substrates, top-coated with 7YSZ and furnace cycled at 1100 ºC focusing along the BC/SA interfaces is presented. Three superalloys were selected considering their Ta content relative to that within the BC: a) no Ta in the superalloy composition (IN100) and either b) similar or c) higher Ta content with respect to the BC (M247LC SX and CMSX-4, respectively). The processing conditions were as-sprayed, as-annealed, after EB-PVD deposition of a 7YSZ top coat, and after furnace cyclic tests (1100 ºC /120 h). The evolution of chemical composition after the different process steps are presented that include a normalization criteria to a Ni-Al-Cr system, elemental profiles as well as Weibull distribution plots of minor containing elements such as Ti, Ta, Mo, or W at the BC/SA interface. The effect of Ta was activated in some coated substrates by the presence of Ti and C in the superalloy consisting of inward Ta-diffusion, trapping of outward diffusing Ti and the subsequent formation of (Ta, Ti)-rich carbides in the BC avoiding possible segregation effects as titanium oxide in the oxide scale.

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“…The Al in the Al-rich ␤ phase is consumed by Al 2 O 3 formation on the surface, producing aluminium depletion zones that increase with time and temperature. 16 When the ␤ phase is completely consumed and the Al concentration reaches a critical minimum, other oxides such as Cr 2 O 3 and/or spinel may form in addition to the protective alumina, leading to internal oxidation. The time at which the ␤ phase is completely consumed is assumed to be the end of the material lifetime.…”

Section: Oxidation Behaviour Of the Porous Substrate In Co-firing Conmentioning

confidence: 99%

Development of a metallic/ceramic composite for the deposition of thin-film oxygen transport membrane

Xing

Baumann

Uhlenbruck

et al. 2013

Journal of the European Ceramic Society

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Comparative study on oxidation behavior of selected MCrAlY coatings by elemental concentration profile analysis

Cited by 46 publications

References 12 publications

Effect of Chemical Compositions and Surface Morphologies of MCrAlY Coating on Its Isothermal Oxidation Behavior

Effect of Chemical Compositions and Surface Morphologies of MCrAlY Coating on Its Isothermal Oxidation Behavior

Microstructure and lifetime of Hf or Zr doped sputtered NiAlCr bond coat/7YSZ EB-PVD TBC systems

Development of a metallic/ceramic composite for the deposition of thin-film oxygen transport membrane

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