Comparison of microstructure and oxidation behavior between Pt-free and Pt-modified δ-Ni 2 Si coatings on Ni-based superalloys

Fu, Caixia; Wang, C. H.; Ren, Zhongming; Cao, Guanghui

doi:10.1016/j.corsci.2015.05.030

Cited by 13 publications

(4 citation statements)

References 57 publications

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“…On the other hand, AlCl 3(g) returns to the 'undepleted pack' zone and reacts with Al powders in the pack to regenerate AlCl (g) (see figure 5) [18]. Generally, the nickel aluminide Ni a Al b is synthesized based on the following reaction [48,49]:…”

Section: Resultsmentioning

confidence: 99%

Microstructural and topographical characterization of the pack cemented aluminide coating applied on Inconel-600

Mahini¹,

Asl²,

Rabizadeh³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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In this research, the pack cementation method was employed to apply a uniform aluminide coating on a substrate of nickel-based superalloy. The obtained intermetallic coating was synthesized using a pack containing 18Al–80Al2O3–2NH4Cl (wt.%) as the main deposition source, an inert filler, and an activator, respectively. The surface morphology and topography, cross-sectional microstructure, the elemental and phase composition, microhardness of the synthesized aluminide coating were studied using atomic force microscopy (AFM), optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), x-ray diffraction (XRD), and Vickers microhardness indenter as the characterization techniques. According to the 3D topography results, the average surface roughness of the Inconel-600 substrate was about 2.446 ± 0.239 nm compared to 43.558 ± 3.876 nm measured for the produced aluminide coating. Additionally, the synthesized coating consisted of NiAl and Ni2Al3 as major phases considering the XRD spectrum. It is also observed that the deposited aluminide coating had a three-layer structure including an outer layer, an inner layer, and a diffusion zone. The Vickers microhardness measurements indicated a significant increase in the microhardness of the substrate (from 185.6 ± 15.8 Hv to 1130.4 ± 42.5 Hv) after applying the aluminide coating. Moreover, the microstructural variations across the deposited aluminide coating led to different microhardness values obtained for each layer. The highest microhardness was observed in the coating diffusion zone, whereas the lowest value belonged to the outer layer.

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Section: Resultsmentioning

confidence: 99%

Microstructural and topographical characterization of the pack cemented aluminide coating applied on Inconel-600

Mahini¹,

Asl²,

Rabizadeh³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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“…which could explain the formation of the both, the Ni 3 Si nickel silicide present in all oxidation conditions and the continuous SiO 2 oxide layer, which is certainly, the main constituent of the oxide scale in all cases. However, the formation of both phases can be considered as a positive finding because both nickel silicides exhibit good oxidation resistance properties [10,11] and SiO 2 reduces oxidation by limiting the diffusion of reactive species [5,12]. Even though the oxidation kinetics of the coated alloys oxidized at 750°C in dry air and dry air + water vapour could suggest that the oxidation phenomena were developed in a similar manner, this was not the case simply because of the development of different oxides within the coating when the coated alloy was exposed to the atmosphere of dry air + water vapour.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, based on this information, it can be established that the formation of the Ni 3 Si phase results from the migration of Si from Ni 2 Si as result of oxidation according to the reaction: which could explain the formation of the both, the Ni 3 Si nickel silicide present in all oxidation conditions and the continuous SiO 2 oxide layer, which is certainly, the main constituent of the oxide scale in all cases. However, the formation of both phases can be considered as a positive finding because both nickel silicides exhibit good oxidation resistance properties [10,11] and SiO 2 reduces oxidation by limiting the diffusion of reactive species [5,12].…”

Section: Discussionmentioning

confidence: 99%

Oxidation behaviour of borided Incoloy 909

Gaona-Martínez

Puente-Ornelas

Gallardo-Hernández

et al. 2019

Surface Engineering

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The oxidation behaviour of Incoloy 909 superalloy subjected to diffusion boronizing treatments was studied at 750 and 850°C in atmospheres of dry air and a mixture of dry air + water vapour for times up to 10 h. The oxidation behaviour of the coated samples was described by the parabolic rate law with activation energies of 26 and 21 kJ mol −1 when oxidation was conducted in dry air or in the mixture dry air + water vapour respectively. Oxidation kinetics of the boronized coatings were sensitive to temperature and the oxidation environment promoting the development of a thick SiO 2 layer on top of the coatings which also included minor additions of other oxides that acted as a barrier that reduced oxidation. However, in the conditions that included water vapour boron-rich oxides were also formed and a different oxidation behaviour was experienced.

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“…The main structural materials for high mechanical and thermal loading are nickel and cobalt-base superalloys protected against aggressive environment by coatings [38][39]. The coating systems currently in use particularly in gas turbine blade applications can be divided into three generic groups [40]:…”

Section: Diffusion Aluminide Coatingsmentioning

confidence: 99%

Cyclic Oxidation of Diffusion Aluminide Coatings

Kianicová¹

2023

Hypersonic and Supersonic Flight - Advances in Aerodynamics, Materials, and Vehicle Design

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The diffusion aluminide coatings are used for high-temperature applications. Structural materials of particular components degrade during service due to fatigue, creep, oxidation, corrosion and erosion. The requirements of higher efficiency of modern industrial applications increase the development of new structural materials, technologies and protective coatings. Properties of many structural materials such ultimate tensile strength, creep strength and fatigue are generally optimized for maximum high-carrying loading with less emphasis on environmental resistance. For these applications, the performance characteristics are limited by the operating conditions, which can be tolerated by the used materials. The main structural materials for high mechanical and thermal loading are superalloys protected against aggressive environment by coatings. Cyclic oxidation is the superposition of thermal cycles in an oxidation environment. The main goal of the experimental work was to compare the cyclic oxidation of protective Al and AlSi coatings deposited on both Inconel 713 LC and MAR-M247 superalloys. The resulting graph revealed that samples from IN 713 LC without coating show good resistance and their mass change is maintained above zero limit. Samples from MAR 247 LC with both Al and AlSi coatings appear to be the most acceptable selection of combination relating to superalloys/coating.

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Comparison of microstructure and oxidation behavior between Pt-free and Pt-modified δ-Ni 2 Si coatings on Ni-based superalloys

Cited by 13 publications

References 57 publications

Microstructural and topographical characterization of the pack cemented aluminide coating applied on Inconel-600

Microstructural and topographical characterization of the pack cemented aluminide coating applied on Inconel-600

Oxidation behaviour of borided Incoloy 909

Cyclic Oxidation of Diffusion Aluminide Coatings

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