Isothermal and Cyclic Oxidation Behavior of HVOF-Sprayed NiCoCrAlY Coatings: Comparative Investigations on the Conventional and Nanostructured Coatings

Ghadami, F.; Rouhaghdam, A. Sabour; Ghadami, S.

doi:10.1007/s11666-020-01111-9

Cited by 14 publications

(5 citation statements)

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“…Therefore, a higher volume fraction of the internal oxides was detected for the oxidized nanocrystalline coating after 50 cycles owing to the reaction of soluble O and metallic Al, Cr, Fe, Co and Ni into the coating cyclic exposure at 1100 °C [37,38]. Among As mentioned elsewhere [34], the high-energy mechanical milling process can synthesize AlCrFeCoNi HEA powder feedstock suitable for APS deposition with an agglomerated morphology composed of numerous fine particles with a nanocrystalline structure. The nanocrystalline HEA powder is susceptible to absorbing a higher volume of oxygen from the atmosphere during the in-flight situation in the APS process compared to the conventional HEA powder with a microcrystalline structure.…”

Section: Oxidation Behavior Of the Nanocrystalline Hea Coatingmentioning

confidence: 84%

“…As mentioned elsewhere [34], the high-energy mechanical milling process can synthesize AlCrFeCoNi HEA powder feedstock suitable for APS deposition with an agglomerated morphology composed of numerous fine particles with a nanocrystalline structure. The nanocrystalline HEA powder is susceptible to absorbing a higher volume of oxygen from the atmosphere during the in-flight situation in the APS process compared to the conventional HEA powder with a microcrystalline structure.…”

Section: Oxidation Behavior Of the Nanocrystalline Hea Coatingmentioning

confidence: 99%

“…For the case of the nanocrystalline coating, under cyclic oxidation, the structural porosity (1.6%) can promote the oxygen interdiffusion into the coating structure to form internal oxidation at the first stage of cyclic oxidation. Conversely, the higher volume fraction of structural grain boundaries in the nanocrystalline HEA coating together with the formation of internal oxidation regions may prevent metallic diffusion and metallic ion consumption to the layers adjacent to the surface [34]. Therefore, the cyclic oxidation resistance of the nanocrystalline AlCrFeCoNi HEA coating increases by the formation of adherent and slow-growing alumina oxide layer after 50 cycles at 1100 • C.…”

Section: Oxidation Behavior Of the Nanocrystalline Hea Coatingmentioning

confidence: 99%

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Cyclic Oxidation Properties of the Nanocrystalline AlCrFeCoNi High-Entropy Alloy Coatings Applied by the Atmospheric Plasma Spraying Technique

2022

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Microcrystalline and nanocrystalline AlCrFeCoNi high-entropy alloy (HEA) coatings were applied on Inconel 718 superalloy using the atmospheric plasma spraying (APS) process. The high-temperature oxidation behavior of the microcrystalline and nanocrystalline AlCrFeCoNi HEA-coated superalloy was examined at 1100 °C under the air atmosphere for 50 cycles under cyclic heating and cooling (1 h for each cycle). The oxidation kinetics of both nanocrystalline- and microcrystalline-coated superalloys were accordingly analyzed by weight change measurements. We noted that the uncoated and coated samples followed the parabolic rate law of the oxidation. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray analysis (EDS), elemental mapping and X-ray photoelectron spectroscopy (XPS) were used to analyze the oxidized coated and uncoated samples. In the HEA-coated superalloy, Fe, Ni, Co and Al were oxidized in the inter-splat region, whereas the splats, which consisted mainly of Ni and Cr, remained unoxidized. Due to the formation of compact and adhesive thin NiO, CoO oxides and spinels together with the Al2O3 oxide scale on the surface of the coating during oxidation, the developed nanocrystalline HEA coating showed better oxidation resistance compared with the microcrystalline HEA coating.

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Section: Oxidation Behavior Of the Nanocrystalline Hea Coatingmentioning

confidence: 84%

Section: Oxidation Behavior Of the Nanocrystalline Hea Coatingmentioning

confidence: 99%

Section: Oxidation Behavior Of the Nanocrystalline Hea Coatingmentioning

confidence: 99%

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Cyclic Oxidation Properties of the Nanocrystalline AlCrFeCoNi High-Entropy Alloy Coatings Applied by the Atmospheric Plasma Spraying Technique

2022

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“…The morphology of the processed powder and microstructure of the obtained coatings were analyzed by a transmission electron microscope (TEM, Phillips, CM300, Netherlands), field emission electron microscope (FESEM, MIRA3-TESCAN, Czech Republic) equipped with energy-dispersive X-ray spectroscopy (EDX, INCA, Oxford Instruments). The preparation process of the freestanding coating specimens for structural observation was carried out using the procedure described in our previous works 22 , 35 , 36 . For the investigations of the structural phases, the conventional and nanocrystalline MCrAlY powders were characterized by the X-ray Diffraction test (XRD) with Cu-Kα radiation (λ = 1.54056 Å) at 40 kV and 40 mA (X’pert, Phillips, Netherlands).…”

Section: Methodsmentioning

confidence: 99%

A comprehensive study on the microstructure evolution and oxidation resistance of conventional and nanocrystalline MCrAlY coatings

Ghadami

Rouhaghdam

Ghadami

2021

Sci Rep

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Conventional and nanocrystalline MCrAlY coatings were applied by the high-velocity oxy-fuel (HVOF) deposition process. The ball-milling method was used to prepare the nanocrystalline MCrAlY powder feedstock. The microstructure examinations of the conventional and nanocrystalline powders and coatings were performed using X-ray diffraction (XRD), high-resolution field emission scanning electron microscope (FESEM) equipped with energy-dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). Williamson–Hall analyzing method was also used for estimation of the crystalline size and lattice strain of the as-milled powders and sprayed coatings. Owing to the investigation of the oxidation behavior, the freestanding coatings were subjected to isothermal and cyclic oxidation testing at 1000 and 1100 °C under static air. The results showed that the conventional as-sprayed MCrAlY coating had a parabolic behavior in the early stage and prolonged oxidation process. On the contrary, in the case of the nanocrystalline MCrAlY coating, the long-term oxidation behavior has deviated from parabolic to sub-parabolic rate law. Moreover, the results also exemplified that the nanocrystalline MCrAlY coating had a greater oxidation resistance following the creation of a continuous and slow-growing Al2O3 scale with a fine-grained structure. The nucleation and growth mechanisms of the oxides formed on the nanocrystalline coating have also been discussed in detail.

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“…Ghadami et al 87,88 prepared nanostructured NiCoCrAlY coatings, and the slow rate formation of a relatively dense oxide layer prevents the interdiffusion of oxygen or the outdiffusion of metal ions. As a result, the oxidation resistance of nanostructured coatings is increased by 35% compared to conventional coatings.…”

Section: Oxidation Resistancementioning

confidence: 99%

Research Progress and Development Trend of Amorphous and Nanocrystalline Composite Coatings: A Review

Zhang¹,

Yuan

Jing³

et al. 2022

JOM

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Compared with crystal alloy, amorphous alloy features atomic arrangement of long-range disorder and near-range order; it has no crystal boundary, dislocation and other defects that can easily promote corrosion initiation and development. With good mechanical properties, wear resistance and corrosion resistance properties, today amorphous alloys have become a research hotspot worldwide. However, the amorphous formation ability is limited, which restricts large-scale preparation, popularization and application of three-dimensional block materials. Due to the technical characteristics of rapid solidification, laser cladding technology and spraying technology are beneficial to the efficient preparation and transformation of amorphous alloy in the form of coating materials. According to the current research progress of amorphous and nanocrystalline composite coatings, this article introduces the typical amorphous and nanocrystalline composite coating alloy systems, summarizes the research progress of preparing amorphous and nanocrystalline composite coatings and expounds the research situation of the main mechanical properties, wear resistance and corrosion resistance of amorphous and nanocrystalline composite coatings. Finally, the application scope of amorphous and nanocrystalline composite coatings is reviewed, and the current problems and future development trends in the study of amorphous and nanocrystalline composite coating are indicated.Zhibin Zhang and Jiachi Yuan have contributed equally to this work.

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Isothermal and Cyclic Oxidation Behavior of HVOF-Sprayed NiCoCrAlY Coatings: Comparative Investigations on the Conventional and Nanostructured Coatings

Cited by 14 publications

References 58 publications

Cyclic Oxidation Properties of the Nanocrystalline AlCrFeCoNi High-Entropy Alloy Coatings Applied by the Atmospheric Plasma Spraying Technique

Cyclic Oxidation Properties of the Nanocrystalline AlCrFeCoNi High-Entropy Alloy Coatings Applied by the Atmospheric Plasma Spraying Technique

A comprehensive study on the microstructure evolution and oxidation resistance of conventional and nanocrystalline MCrAlY coatings

Research Progress and Development Trend of Amorphous and Nanocrystalline Composite Coatings: A Review

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