Nanoparticles in hafnium-doped aluminide coatings

Romanowska, Jolanta; Morgiel, J.; Zagula-Yavorska, Maryana; Sieniawski, Jan

doi:10.1016/j.matlet.2015.01.089

Cited by 12 publications

(8 citation statements)

References 28 publications

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“…Co-doped aluminide coatings were deposited on the CMSX-4 superalloy of the following nominal composition: Ni-61.5, Cr-6.5, Mo-0.6, Ta-6.5, Al-5.6, Ti-1, Co-9, W-6, He-0,1, Re-3 wt%. Samples were cut from the rod, polished, degreased ultrasonically in acetone, and etched [25]. Palladium layers were deposited by the electrochemical method in three steps (Tables 1-3):…”

Section: Methodsmentioning

confidence: 99%

The Influence of Pd and Zr Co-Doping on the Microstructure and Oxidation Resistance of Aluminide Coatings on the CMSX-4 Nickel Superalloy

2021

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Pd + Zr co-doped aluminide coatings were deposited on the CMSX-4 nickel superalloy, widely used in the aircraft industry, in order to investigate their microstructure and improvement of oxidation resistance. Palladium was deposited by the electrochemical method, whereas zirconium and aluminum by the chemical vapor deposition (CVD) method. Coatings consist of two zones: the additive and the interdiffusion one. The additive zone contains β–(Ni,Pd)Al phase with some zirconium-rich precipitates close to the coating’s surface, whereas the interdiffusion zone consists of the same β–(Ni,Pd)Al phase with inclusions of refractory elements that diffused from the substrate, so called topologically closed-packed phases. Palladium dissolves in the β–NiAl phase and β–(Ni,Pd)Al phase is being formed. Pd + Zr co-doping improved the oxidation resistance of analysed coatings better than Pd mono-doping. Mechanisms responsible for this phenomenon and the synergistic effect of palladium and zirconium are discussed.

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Section: Methodsmentioning

confidence: 99%

The Influence of Pd and Zr Co-Doping on the Microstructure and Oxidation Resistance of Aluminide Coatings on the CMSX-4 Nickel Superalloy

2021

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“…Two-layer microstructure of rhodium incorporated aluminide coating was typical for aluminide coatings [26]. Rhodium existed in solid solution in the coating.…”

Section: Discussionmentioning

confidence: 93%

The effect of precious metals in the NiAl coating on the oxidation resistance of the Inconel 713 superalloy

Zagula-Yavorska

Romanowska

2022

J min metall B Metall

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The rhodium incorporated aluminide coating was produced by the rhodium electroplating (0.5 ?m thick layer) followed by the chemical vapor deposition process on the Inconel 713 superalloy. This coating is composed of the ?-NiAl phase. A part of nickel atoms is replaced by rhodium atoms in the ?-NiAl phase. The plain, rhodium and platinum incorporated aluminide coatings were oxidized at 1100?C under the atmospheric pressure. The oxidation kinetics of the rhodium and platinum incorporated aluminide coatings are similar, but different than oxidation kinetic of the plain coating. The ?-Al2O3 is the main product both in rhodium and platinum modified coatings after 360 h of oxidation. Moreover, the ?-Ni3Al phase, besides the ?-NiAl phase, was identified. The presence of 4 at. % rhodium in the coating provides similar oxidation resistance as the presence of 10-20 at. % platinum. Both rhodium and platinum incorporated aluminide coatings produced by the chemical vapor deposition process offer good oxidation protection of the Inconel 713 superalloy.

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“…Moreover, niobium forms NbC precipitates in the interdiffusion layer. Neither Kirkendall-like porosity nor any Al 2 O 3 oxide precipitates at the additive/interdiffusion layer interface were observed, even as they were noted at such interfaces in case of hafnium-doped aluminide coatings on pure nickel [ 25 ]. Kirkendall porosity forms in some systems because of unbalanced diffusion of species into and out of the alloy.…”

Section: Resultsmentioning

confidence: 99%

SEM/TEM Investigation of Aluminide Coating Co-Doped with Pt and Hf Deposited on Inconel 625

et al. 2018

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The effect of simultaneous introduction of Hf and Pt into aluminide coating deposited on Inconel 625 alloy was investigated using scanning and transmission electron microscopy (SEM/TEM) methods. The coating consisted of two layers: the additive and the interdiffusion. The additive layer and part of the interdiffusion layer consist of the β-NiAl type phase. The middle part of the interdiffusion layer comprised an interpenetrating finger-like structure formed by the β-NiAl and TCP—σ type phases with numerous fine Cr precipitates in the former and occasional larger precipitates of NbC carbides interspersed in between them. The σ type phase inclusions are situated at the border between the substrate and the interdiffusion layer. The experiment showed that platinum fully dissolves in the β-NiAl-type matrix, while most of the introduced hafnium accumulates in HfO2 dioxide precipitates located close to the additive/interdifusion interface.

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Nanoparticles in hafnium-doped aluminide coatings

Cited by 12 publications

References 28 publications

The Influence of Pd and Zr Co-Doping on the Microstructure and Oxidation Resistance of Aluminide Coatings on the CMSX-4 Nickel Superalloy

The Influence of Pd and Zr Co-Doping on the Microstructure and Oxidation Resistance of Aluminide Coatings on the CMSX-4 Nickel Superalloy

The effect of precious metals in the NiAl coating on the oxidation resistance of the Inconel 713 superalloy

SEM/TEM Investigation of Aluminide Coating Co-Doped with Pt and Hf Deposited on Inconel 625

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