A kinetic model for iron aluminide coating by low pressure chemical vapor deposition: Part II. Model formulation

John, Joseph; Kale, G.B.; Bharadwaj, S.R.; Srinivasa, R.S.; De, P.K.

doi:10.1016/j.tsf.2004.02.041

Cited by 19 publications

(19 citation statements)

References 20 publications

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“…However, the mechanism leading to deposition of Al coatings at the surface has been widely discussed by different author. John et al [23,24] obtained aluminium diffusion coating with a home-made CVD process using liquid aluminium as donor and AlCl 3(g) . They suggest a mechanism for coating formation represented by Eq.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

Iron aluminide coatings on ferritic steels by CVD-FBR technology

et al. 2006

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Section: Thermodynamic Analysismentioning

confidence: 99%

Iron aluminide coatings on ferritic steels by CVD-FBR technology

et al. 2006

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“…[20][21][22] The most important reactions that occur when Al and HCl react are given below together with the reaction Gibbs energy which was calculated for the operational temperature of 550°C (DG r550°) . …”

Section: Thermodynamic Simulation Of Aluminum Depositionmentioning

confidence: 99%

CVD in a Fluidized Bed Reactor: A Method of Developing Coatings at Temperatures below 600 °C

Sánchez

Bolívar

Hierro

et al. 2007

Chemical Vapor Deposition

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The technique of CVD in a fluidized bed reactor (CVD-FBR) has a useful application in obtaining a protective coating on a substrate using a low work temperature, less than 600°C. In this way, ferritic steels such as P-91, P-92, or P-122 can be coated at temperatures that do not change their microstructural properties. Coatings improve the chemical properties of substrates and their high temperature durability in corrosive environments. The aim of this paper is a general review of the deposition, co-deposition, or modified deposition of several elements, such as Al, Si, Al/Si, and Al/Hf, that can form various coatings on ferritic steels at low temperature. Deposition on ferritic steel using CVD-FBR has been studied. The coatings obtained are studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). In the Al and Al modified with Hf depositions, the coatings are composed only of (Fe,Cr) 2 Al 5 or (Fe,Cr) 2 Al 5 and (Fe,Cr)Al 3 intermetallic phases, depending to the experimental conditions. The Al/Si coating is formed by (Fe,Cr) 2 (Al,Si) 5 , and, finally, the Si coating is composed of SiFe 3 intermetallic phase.

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“…Depending on the temperature and/or on process conditions, one or more of these phases can be observed. Concerning the physical description of phenomena involved in aluminizing, sets of chemical reactions and of gas-and solid-state diffusion processes are considered [7]. Further, since the rate of Al transport in processes involving gaseous transportation is high, aluminizing processes are typically controlled and can thus be described in terms of the solid-state diffusion of the Al deposited on the component surface [3,7].…”

Section: Introductionmentioning

confidence: 99%

“…In such processes, under equilibrium conditions, the activity of Al on the coating surface equals that of the Al-source material [3][4][8][9][10]. It was also demonstrated that, at a given temperature, the surface composition of the component is related to that of the Al-source and that it can be considered as constant with time [1,7,10]. For the above reasons, the key process parameters to be taken into account for process control or modeling are the time and the temperature at which the aluminizing occurs (the latter typically kept constant during the process).…”

Section: Introductionmentioning

confidence: 99%

Modelling of Phase Evolution during Aluminizing Processes

Gariboldi

Verani

Riva

2011

AMR

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Abstract. Aluminizing processes are a well-known set of techniques industrially adopted to enrich in aluminum the surface layers of Ni-based alloys, thus improving their resistance to environmental interactions at high temperature. The results of aluminizing are described in terms of the presence, compositions and thickness of the sequence of the resulting surface diffusion layers. A combination of difficulties arising both from the mathematical and the material side restricted the number of available user-friendly models and their applicability to specific alloys or process conditions. The aim of the research work here presented is to overcome part of these difficulties. A synthesis of some well-established models was implemented in a robust numerical algorithm, that automatically prevents instabilities and convergence problems. Such numerical algorithm has been experimentally validated by comparing the results to the experimentally measured composition of profiles obtained for a set of vapor-phase aluminized samples of commercially pure Ni. The model was then applied to predict the effects of the process temperature and of the chemical composition of the surface.

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A kinetic model for iron aluminide coating by low pressure chemical vapor deposition: Part II. Model formulation

Cited by 19 publications

References 20 publications

Iron aluminide coatings on ferritic steels by CVD-FBR technology

Iron aluminide coatings on ferritic steels by CVD-FBR technology

CVD in a Fluidized Bed Reactor: A Method of Developing Coatings at Temperatures below 600 °C

Modelling of Phase Evolution during Aluminizing Processes

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