Influence of the superalloy substrate in the synthesis of the Pt-modified aluminide bond coat made by slurry

Mollard, M.; Pedraza, F.; Bouchaud, B.; Montero, X.; Galetz, Mathias C.; Schütze, M.

doi:10.1016/j.surfcoat.2015.03.015

Cited by 12 publications

(6 citation statements)

References 44 publications

(55 reference statements)

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“…Then, a second heating rate up to 650°C followed by a 3h dwell at this intermediate temperature involves the Al melting and the subsequent sintering of the particles. Also, the final dwell of the annealing has to be carried out at higher temperature in order to promote the Al inward and the simultaneous Ni, Fe outward diffusion to create the aluminide coating [23,32]. The DSC measurements realized in this study confirm thus previous works realized in our group although the Al particles (supplier and size) were different [25][26][27]29].…”

Section: -Aluminium Particles and Corresponding Slurry Characterisasupporting

confidence: 82%

“…After drying in ambient air for at least 1 hour [31], the coated samples were annealed in argon (400°C/3h + 650°C/3h + 1000°C/1h or 1100°C/1h for, respectively the ferritic-martensitic steel and the austenitic stainless steels). These coating conditions were based in previous investigations on nickel-based superalloys [23,32] but were slightly lowered in temperature and shortened in time for these Fe-based alloys.…”

Section: -Aluminisationmentioning

confidence: 99%

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Characterisation of aluminium diffusion coatings elaborated on austenitic stainless steels and on ferritic-martensitic steels

Boulesteix

Pedraza

2018

Surface and Coatings Technology

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Slurry aluminide coatings were elaborated on IN-800HT and HR3C austenitic stainless steels (ASS) and on P92 ferritic-martensitic steels. The thermal treatments conducted in Ar enabled the melting of Al and the high temperature synthesis with the substrate elements to result in an aluminium diffusion coating. Whether for the ferritic-martensitic or the austenitic stainless steels, the coatings were formed by the simultaneous Al inward diffusion into the steel matrix and the outward diffusion of Fe (and Ni for the ASS) on both steel substrates. As a result, the coatings exhibited a B2-(Fe,Ni)Al phase for the ASS and B2-FeAl phase for the P92 substrate. A reduction of the grain size after annealing was noticed for the ASS but their microstructures remained mostly austenitic. However, a significant increase of the grain size occurred in the P92 steel with a transformation from the initial tempered martensitic structure to an austenitic structure. The microhardness of the ASS did not change significantly whereas for P92, a large increase occurred.

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Section: -Aluminium Particles and Corresponding Slurry Characterisasupporting

confidence: 82%

Section: -Aluminisationmentioning

confidence: 99%

Characterisation of aluminium diffusion coatings elaborated on austenitic stainless steels and on ferritic-martensitic steels

Boulesteix

Pedraza

2018

Surface and Coatings Technology

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“…The main phases post Pt coating are γ-(Ni,Pt) and γʹ-(Ni,Pt)3Al. It is reported that the Pt atom possesses high solubility in both of the γ-Ni and γʹ-Ni3Al phases [19][20][21]. The diffraction peaks of the γ-(Ni,Pt) and γʹ-(Ni,Pt)3Al phases shift to lower angles, compared with the diffraction peaks of the γ-Ni (PDF#04-0850) and γʹ-Ni3Al (PDF#09-0097) phases, since the atomic radius of the Pt atom (0.183 nm) is larger than that of the Ni atom (0.162 nm) [22].…”

Section: Methodsmentioning

confidence: 99%

Preparation and Isothermal Oxidation Behavior of Zr-Doped, Pt-Modified Aluminide Coating Prepared by a Hybrid Process

Fan

Wang

et al. 2017

Coatings

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Abstract:To take advantage of the synergistic effects of Pt and Zr, a kind of Zr-doped, Pt-modified aluminide coating has been prepared by a hybrid process, first electroplating a Pt layer and then co-depositing Zr and Al elements by an above-the-pack process. The microstructure and isothermal oxidation behavior of the coating has been studied, using a Pt-modified aluminide coating as a reference. Results showed that the Zr-doped, Pt-modified aluminide coating was primarily composed of β-(Ni,Pt)Al phase, with small amounts of PtAl 2 -and Zr-rich phases dispersed in it. The addition of Zr diminished voids on the coating surface since Zr could hinder the growth of β-NiAl grains. It also helped to increase the spalling resistance of the oxide scale and reduce the oxidation rate, which made the Zr-doped, Pt-modified aluminide coating possess better oxidation resistance than the reference Pt-modified aluminide coating at the temperature of 1100 • C.

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“…Presently, however, aluminide TPB studies are mainly devoted to preparation technique and performance optimization. For the alloying effect, especially the substrate effect, some work has been conducted on aluminide coatings on Ni-based superalloys [15], while for aluminide coating on steels, much less work has been involved. In fact, the alloying effect is very important for preparation technique optimization and coating structure design, and thus is a substantial fundamental issue in the practical preparation and application of aluminide TPBs on steels.…”

Section: Introductionmentioning

confidence: 99%

“…[3,[25][26][27]. Though different preparation techniques, e.g., hot-dipping aluminization (HDA), pack cementation (PC), plasma spraying (PS), and electrochemical deposition (ECD), have been adopted for these steels, the intrinsic properties of steel substrates could have some influence on the formation of aluminide coatings [8,15], since the alloying elements and metallographic phases differ a lot [3,[25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Effect of Steel Substrates on the Formation and Deuterium Permeation Resistance of Aluminide Coatings

et al. 2019

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The effect of steel substrates on the formation and deuterium permeation resistance of aluminide coatings for tritium permeation barrier applications was investigated. It was found that the average thickness and crystal structure of electrodeposited Al coatings varied with Cr steel substrates. After aluminization in vacuum, significant differences existed in the composition and thickness of (Fe,Cr) 2 Al 5 -type aluminide layers formed on different Cr steel substrates, in which the alloying element Cr from steel substrates was involved. Thereafter, the scale microstructural feature and thickness also changed with the Cr steel substrate after selective oxidation in an Ar gas stream. Consequently, the deuterium permeation resistance of the formed aluminide tritium permeation barriers (TPBs) differed by steel substrates, indicating that the substrate effect existed in aluminide TPB coatings and thus could have a significant influence on the formation and eventual performance of aluminide TPBs.

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Influence of the superalloy substrate in the synthesis of the Pt-modified aluminide bond coat made by slurry

Cited by 12 publications

References 44 publications

Characterisation of aluminium diffusion coatings elaborated on austenitic stainless steels and on ferritic-martensitic steels

Characterisation of aluminium diffusion coatings elaborated on austenitic stainless steels and on ferritic-martensitic steels

Preparation and Isothermal Oxidation Behavior of Zr-Doped, Pt-Modified Aluminide Coating Prepared by a Hybrid Process

Effect of Steel Substrates on the Formation and Deuterium Permeation Resistance of Aluminide Coatings

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