Formation and modelling of aluminide coatings on iron by a fluidised bed CVD process

Christoglou, Ch.; Voudouris, N.; Angelopoulos, G.N.

doi:10.1016/s0257-8972(02)00044-0

Cited by 48 publications

(22 citation statements)

References 14 publications

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“…The inherent property of Al to form a protective, stable Al 2 O 3 layer in an oxygencontaining atmosphere makes it a suitable material for surface enrichment of any steel components operating at high temperature in aggressive environments, e.g., oil refineries, power plants, and some aeronautical applications [18,19]. Alumina also has excellent mechanical properties and good chemical stability at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Improvement in Resistance to Steam Oxidation of Aluminide-Coated AISI 304 and AISI 316 Steel Produced by Chemical Vapor Deposition in a Fluidized Bed Reactor

2015

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Various techniques have been used to deposit aluminium on ferritic and austenitic steels to increase their oxidation resistance. An aluminide coating was deposited on AISI 304 and AISI 316 stainless steels by chemical vapor deposition at 580°C for 1.5 h in a fluidized bed reactor. The as-deposited samples were treated at 750°C in Ar atmosphere for 2 h. Scanning electron microscopy/energy-dispersive X-ray spectroscopy and X-ray diffractometry were used to study morphology and composition. Deposition results indicated that FeAl, Fe 2 Al 5 , Al 0.99 Fe 0.99 Ni 0.02 , AlNi, and Fe 2 AlCr had formed. Specimens were oxidized in a steam loop at 750°C for 1000 h to evaluate the steam oxidation resistance of the coating. The thermodynamic software package Thermo-Calc was used for simulations under similar experimental oxidation conditions. Gravimetric measurements verified that the mass change of the coated samples decreased up to 100 times with respect to uncoated steels.

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Section: Introductionmentioning

confidence: 99%

Improvement in Resistance to Steam Oxidation of Aluminide-Coated AISI 304 and AISI 316 Steel Produced by Chemical Vapor Deposition in a Fluidized Bed Reactor

2015

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“…The pack-cementation process has been commonly used to cover iron-base alloys and to form aluminide compounds on their surface. 15,[21][22][23][24][25][26] This paper deals with the high-temperature oxidation behavior of a model alloy (Fe-30Cr) subjected to a surface modification by a packcementation process. The choice of a ferritic Fe-30Cr alloy was made in order to form an iron-aluminide coating on a model material; the idea was to understand the fundamental oxidation mechanisms after surface treatment with no expected industrial application of this material, because austenitic substrates are better for high-temperature aplications.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature-Oxidation Behavior of Iron–Aluminide Diffusion Coatings

2006

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Aluminide diffusion coatings were oxidized in air under atmospheric pressure under isothermal and cyclic conditions. The high-temperature efficiency of the pack-aluminized alloys was tested by comparing their oxidation behavior in the temperature range 800-1080°C. The k p values deduced from the parabolic plots of weight-gain curves showed that a-Al 2 O 3 composed the major phase of the oxide scale on samples oxidized at T > 1000°C. For lower temperatures, transient-alumina phases were observed. The aluminide materials also exhibited excellent resistance to cyclic oxidation at 1000°C. The second aim of this study was to dope the aluminide compounds obtained by a pack-cementation process with yttria, which was introduced by metal-organic chemical-vapor deposition (MOCVD). The beneficial effect of the reactive-element-oxide coating is strongly dependent on its mode of introduction, since the oxidation resistance is drastically increased when the Y 2 O 3 coating was applied prior to the aluminization process. When applied after the aluminization, the reactive element gave negative effects on the high-temperature oxidation behavior of the iron aluminides. The oxide morphologies, X-ray diffraction patterns and two-stage experiments helped to understand the oxide-scale-growth mechanisms.

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“…This is 0022-3115/$ -see front matter Ó 2012 Elsevier B.V. All rights reserved. http://dx.doi.org/10.1016/j.jnucmat.2012.08.012 the reason why pack cementation is usually applied to steels and superalloys to improve their resistance to oxidation at elevated temperatures [20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Formation of diffusion barrier coating on superalloy 690 substrate and its stability in borosilicate melt at elevated temperature

Dutta

Yusufali

Paul

et al. 2013

Journal of Nuclear Materials

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Formation and modelling of aluminide coatings on iron by a fluidised bed CVD process

Cited by 48 publications

References 14 publications

Improvement in Resistance to Steam Oxidation of Aluminide-Coated AISI 304 and AISI 316 Steel Produced by Chemical Vapor Deposition in a Fluidized Bed Reactor

Improvement in Resistance to Steam Oxidation of Aluminide-Coated AISI 304 and AISI 316 Steel Produced by Chemical Vapor Deposition in a Fluidized Bed Reactor

High-Temperature-Oxidation Behavior of Iron–Aluminide Diffusion Coatings

Formation of diffusion barrier coating on superalloy 690 substrate and its stability in borosilicate melt at elevated temperature

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