Evaluation of the hot corrosion resistance of commercial β-NiAl and developmental γ′-Ni3Al+γ-Ni-based coatings

Deodeshmukh, Vinay; Gleeson, Brian

doi:10.1016/j.surfcoat.2007.06.018

Cited by 16 publications

(7 citation statements)

References 9 publications

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“…Gleeson and his collaborators demonstrated that platinum‐modified γ/γ′‐NiPtAl containing modest Al contents and doped with up to 0.5% hafnium can outperform the high‐aluminium platinum‐modified β‐NiPtAl that are in current commercial use as bond coats in turbine applications (Hayashi & Gleeson, 2005; Izumi & Gleeson, 2005, 2007; Deodeshmukh et al , 2006; Deodeshmukh & Gleeson, 2007; Izumi et al , 2007; Hayashi et al , 2008; Hayashi & Gleeson, 2009). Hafnium is a widely used reactive element and in modest amounts will improve the adhesion of passive alumina scales.…”

Section: Resultsmentioning

confidence: 99%

The use of laser scanning confocal microscopy (LSCM) in materials science

Hovis

Heuer

2010

Journal of Microscopy

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Summary Laser scanning confocal microscopes are essential and ubiquitous tools in the biological, biochemical and biomedical sciences, and play a similar role to scanning electron microscopes in materials science. However, modern laser scanning confocal microscopes have a number of advantages for the study of materials, in addition to their obvious uses for high resolution reflected and transmitted light optical microscopy. In this paper, we provide several examples that exploit the laser scanning confocal microscope's capabilities of pseudo‐infinite depth of field imaging, topographic imaging, photo‐stimulated luminescence imaging and Raman spectroscopic imaging.

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Section: Resultsmentioning

confidence: 99%

The use of laser scanning confocal microscopy (LSCM) in materials science

Hovis

Heuer

2010

Journal of Microscopy

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“…Diffusion coating materials designed to protect nickel-based alloy components at high temperatures are based on simple aluminide or modified nickel aluminide compounds commonly used in advanced thermal barrier coating (TBC) systems [1][2][3][4][5][6]. Current state-of-the-art bond coatings for TBC systems are either β-(Ni, Pt)Al or MCrAlY (M = Ni, Co or Ni + Co; Y = yttrium), both with high aluminum contents.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and oxidation behavior of Al + Si co-deposited coatings on nickel-based superalloys

Kong

Cao

2014

Surface and Coatings Technology

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Diffusion coatings have been widely used to metallic protective coatings or bond coats in thermal barrier coatings (TBCs) to protect the aeronautical turbine blades from detrimental oxidation and hot corrosion. However, degradation of these coatings caused by oxidation or hot corrosion can be particularly severe and rapid in the operating environment of the turbine. We present an experiment to modify γ-Ni + γ′-Ni 3 Al coating by co-deposition of Al and Si in order to improve the performance of coatings. In this study, microstructure and oxidation behavior of Al and Si co-deposited diffusion coatings were investigated. These coatings were deposited by Pt electroplating followed by aluminization and siliconization using the pack cementation process. The composition (in wt.%) of the packs was 2Al-4NH 4 Cl-xSi-(94 − x)Al 2 O 3 with different Si contents (x = 4, 6, 8 and 10) and the corresponding microstructure of the coatings was δ-Ni 2 Si. The isothermal oxidation tests at 1000°C in air indicated that the coating formed using the packs containing 10 wt.% Si had optimal oxidation resistance. After oxidation, the microstructure of the coatings was that of Cr 2 NiO 4 + NiO or NiO + Al 2 O 3 . The mechanisms through which Sirich coating forms and protects against oxidation are discussed.

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“…Hot corrosion of b-NiAl compound either as a bulk material or as the main constituent of protective aluminide coatings has been studied extensively [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Crevice Formation on the Surface of the Simple and Ti-Modified Aluminide Coatings Under a Fused Na2SO4 Salt Film

2011

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The hot-corrosion behavior of simple and Ti-modified aluminide coatings on nickel-based superalloy B-1900 was investigated. The sodium sulfate salt deposition rate was 1 mg/cm 2 for each 32 h at 900°C. Although the mass change data showed relatively more durability for the modified coatings, morphological characterization of the specimens and corrosion products revealed similar degradation mechanisms for all coatings studied. The base of a that pit developed during hot corrosion initiation had a low oxygen pressure and the pits grew perpendicular to the surface to create deep crevices. The growth and joining of these crevices caused large pieces of the coating to be lost, exposing the bare substrate to the fused salt at longer times. The initiation and advancement of the crevices are discussed and a mechanism is proposed to explain this type of hot corrosion morphology.

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Evaluation of the hot corrosion resistance of commercial β-NiAl and developmental γ′-Ni3Al+γ-Ni-based coatings

Cited by 16 publications

References 9 publications

The use of laser scanning confocal microscopy (LSCM) in materials science

The use of laser scanning confocal microscopy (LSCM) in materials science

Microstructure and oxidation behavior of Al + Si co-deposited coatings on nickel-based superalloys

Crevice Formation on the Surface of the Simple and Ti-Modified Aluminide Coatings Under a Fused Na2SO4 Salt Film

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