Formation mechanism of high activity aluminide coating on Ni-CeO2 coated Rene 80 alloy

Safari, Mahdi; Nogorani, Farhad Shahriari

doi:10.1016/j.surfcoat.2017.09.035

Cited by 14 publications

(4 citation statements)

References 26 publications

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“…They have pointed out that the presence of a primary electroplated Ni layer could inhibit the formation of Kirkendall pores during aluminizing, as well as improving its oxidation resistance. Furthermore, Safari et al [34] have reported that the chemical modification of the aluminide coating through electrodeposition of Ni-CeO 2 layer could improve the cyclic oxidation resistance of the obtained coating. In another study by Qiao and Zhou [35], it has been shown that the addition of Co into the simple NiAl coating could lower the oxidation kinetics which was attributed to the formation of a thin and compact film of a-Al 2 O 3 onto the coating sur-face.…”

Section: Introductionmentioning

confidence: 99%

Development of hybrid electrodeposition/slurry diffusion aluminide coatings on Ni-based superalloy with enhanced hot corrosion resistance

Zakeri

Balashadehi

Rouhaghdam

2021

jcc

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Ni/Co-modified aluminide coatings were prepared on the Hastelloy-X superalloy by a combined process of electrodeposition and slurry aluminizing. In this regard, pure layers of Ni and Ni-50wt.%Co were initially applied via electrodeposition process and successive aluminization was carried out by a slurry technique. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques were used for the microstructural and chemical composition characterization of the specimens. The results of these analyses revealed that a compact and dense aluminide coating was formed with a two-layered structure containing the outer Al-rich β phase and inner interdiffusion zone. Moreover, the presence of pre-electrodeposited layers inhibited the outward diffusion flux of elements from the substrate and effectively suppressed the formation of Kirkendall pores. The hot corrosion studies of the obtained coatings indicated that the addition of a pre-electrodeposited layer could enhance the high-temperature corrosion performance of the coatings when exposed to sulfate salt.

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Section: Introductionmentioning

confidence: 99%

Development of hybrid electrodeposition/slurry diffusion aluminide coatings on Ni-based superalloy with enhanced hot corrosion resistance

Zakeri

Balashadehi

Rouhaghdam

2021

jcc

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“…Research attempts were also made by performing electrodeposition of different combinations of metals followed by addition of rare earths (such as Zr [ 44 , 47 ], Hf [ 4 , 48 ], and Ce; and their oxides) [ 49 ]. The incorporation of all the above-mentioned elements (Pt, Pd, Zr, Hf) and their combination through electroplating followed by diffusion aluminising was demonstrated to influence the oxidation resistance of aluminide coatings positively.…”

Section: The Role Of Electrodeposition In Thermal Barrier Coatingsmentioning

confidence: 99%

Progress in Novel Electrodeposited Bond Coats for Thermal Barrier Coating Systems

Maniam

Paul

2021

Materials

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The increased demand for high performance gas turbine engines has resulted in a continuous search for new base materials and coatings. With the significant developments in nickel-based superalloys, the quest for developments related to thermal barrier coating (TBC) systems is increasing rapidly and is considered a key area of research. Of key importance are the processing routes that can provide the required coating properties when applied on engine components with complex shapes, such as turbine vanes, blades, etc. Despite significant research and development in the coating systems, the scope of electrodeposition as a potential alternative to the conventional methods of producing bond coats has only been realised to a limited extent. Additionally, their effectiveness in prolonging the alloys’ lifetime is not well understood. This review summarises the work on electrodeposition as a coating development method for application in high temperature alloys for gas turbine engines and discusses the progress in the coatings that combine electrodeposition and other processes to achieve desired bond coats. The overall aim of this review is to emphasise the role of electrodeposition as a potential cost-effective alternative to produce bond coats. Besides, the developments in the electrodeposition of aluminium from ionic liquids for potential applications in gas turbines and the nuclear sector, as well as cost considerations and future challenges, are reviewed with the crucial raw materials’ current and future savings scenarios in mind.

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“…The optimized amount of cerium and cerium oxides deposited in the scale/coating interface and along grain boundaries leads to improvement of the lifetime and thermal stability of the aluminide coatings. The optimized content of segregated cerium ions inhibits the rapid outward/inward intermetallic diffusion of elements along the coating grain boundary and cause a finer-grained microstructure of the β-NiAl and δ-Ni2Al3 phases in the coatings [41,42] which enhances the oxide scales adhesion, hot corrosion, and oxidation resistance of the aluminide coating [33,[43][44][45][46]. Cerium mostly stands against the outward diffusion of aluminum ions and inward diffusion of oxygen through the process named ''the blocking effect".…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Cyclic Oxidation Resistance of Ce-Si Modified Aluminide Coating Deposited by Pack Cementation on Inconel 738LC

Nourpoor¹,

Javadian²,

Rouhaghdam³

et al. 2022

Preprint

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The synergistic effect of silicon and cerium addition on the oxidation resistance of pack cementation aluminide coating applied on Ni-based superalloy substrate was investigated. The effect of cerium and silicon on the scale morphology, oxidation behavior, and scale spallation tendency are discussed based on the experimental results, using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray analyses (EDX). In addition, the oxidation resistance was evaluated by measuring the weight of samples after each 16-hour cycle at 1100˚C for 50 cycles. The experiments indicated that silicon addition to aluminide coating improves the oxidation resistance through the formation of β-NiAl1-nSin and δ-Ni2Al3-nSin and δ-Ni2Si phases. Furthermore, the addition of 1% cerium to modified aluminide enhances the formation of the fine-grained microstructure of the β-NiAl and δ-Ni2Al3 and reduces the outward/inward diffusion of elements (so-called blocking effect) which significantly modifies the hot oxidation resistance. The addition of 2% cerium, owing to the distortion of the β-NiAl and δ-Ni2Al3 phases, strictly decreases the hot oxidation resistance and the coating is exfoliated after 450 h at 1100 °C. The cyclic oxidation tests showed that the samples containing 1% cerium and 6% silicon possess the highest hot oxidation resistance in which 2 mg/cm2 weight loss of Ce-Si-aluminide was reported after 800 h. This is attributed to the simultaneous effect of cerium and silicon during the deposition process which reduces the oxygen diffusion and reduces the growth rate of α-Al2O3 during oxidation tests. The α-Al2O3 oxidation layer morphology showed that finer grains are formed in samples containing optimum ratios of cerium and silicon which indicates that these elements improve the coating adhesion and oxidation resistance simultaneously.

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Formation mechanism of high activity aluminide coating on Ni-CeO2 coated Rene 80 alloy

Cited by 14 publications

References 26 publications

Development of hybrid electrodeposition/slurry diffusion aluminide coatings on Ni-based superalloy with enhanced hot corrosion resistance

Development of hybrid electrodeposition/slurry diffusion aluminide coatings on Ni-based superalloy with enhanced hot corrosion resistance

Progress in Novel Electrodeposited Bond Coats for Thermal Barrier Coating Systems

Microstructure and Cyclic Oxidation Resistance of Ce-Si Modified Aluminide Coating Deposited by Pack Cementation on Inconel 738LC

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