Formation of aluminide coatings on Ni and austenitic 316 stainless steel by a low temperature FBCVD process

Anastassiou, Alexandros; Christoglou, Ch.; Angelopoulos, G.N.

doi:10.1016/j.surfcoat.2009.12.018

Cited by 10 publications

(8 citation statements)

References 15 publications

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“…The diffusion of Al and Fe into the substrate results in the formation of aluminides. Many researchers have observed Fe and Cr diffusion towards the sample surface during steam oxidation [20][21][22][23][24][25][26]. During the final stages of oxidation, the sample has already lost a critical amount of Al and/or the alumina has evaporated.…”

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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“…Subsequently, in the second step, chemical transformation takes place at the outer layer interfaces with the participation of diffusing atoms of one of the two components (B in our case) and the surface atoms of the other component (Fe atoms from FeAl). The B atoms enter the reaction that exists at the surface of the FeAl while the Fe has to come from the mass of the substrate (FeAl) [24]. If the kinetics were controlled purely by reaction barriers, the boride layers would grow proportionally to time.…”

Section: Discussionmentioning

confidence: 99%

The kinetics and mechanical study of borided iron aluminide (FeAl)

Usta¹,

Ekmekciler²

2010

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The kinetics of formation of iron borides by boronizing of FeAl was studied. FeAl samples were exposed to boronizing process in a solid medium at 875 • C, 940 • C, 1040 • C for 2, 4 and 8 h. The characterization and morphology of boride layers were studied by XRD analysis and metallographic technique. The results showed that increasing boronizing time and temperature led to thicker boride layers. The thickness of boride layers ranged from 8 to 60 µm with changing boronizing temperatures and times. Depending on treatment temperatures and times, the hardness of the boride layers ranged from 1290 to 1500 HV, while the hardness of the substrate ranged from 340 to 490 HV. XRD analysis revealed that FeB phase was a major phase at all temperatures. However, Fe2B phase was detected as a minor phase at only 1040 • C for 8 h. The formation of iron borides followed a parabolic growth rate law, showing a diffusion-controlled process.

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“…For maximum load was used 1mN, making the plot of nano-hardness profiles with about 20 µm from coating to substrate, with 2 µm steps close to interphase (C-S) and 15 µm on the substrate. The produced diffusion by oxidation process on coatings materials, as well as substrates, produce important changes in the chemical and mechanical properties (2,5,6) . On this basis, to know the hardness at micro and nano scale will drive the future researching and they will provide relevant information about improvements in surface engineering area.…”

Section: Figure 1 Selected Zones For Micro Hardness Testmentioning

confidence: 99%

“…However, the water vapor in the air or oxygen can have a not good effect in the stainless steels oxidation inducing it to the catastrophic oxidation, due to the formation of not-protective oxide layer rich in iron, reducing the performance and service life of iron. The oxidation by water vapor has highly importance in materials selection for electric energy generation by vapor turbines, since in thermal plants many components are exposed to the water vapor at high temperature (4)(5)(6) .…”

Section: Introductionmentioning

confidence: 99%

Caracterización Mecánica De Recubrimientos De Aluminio-Silicio Depositados Por CVD-FBR Sobre El Acero Inoxidable Aisi 316 Y Oxidado en Vapor De Agua

Pérez-Muñoz

Arévalo

Téllez

2018

inycomp

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El recubrimiento de Aluminio-Silicio fue depositado a 540 °C sobre el acero austenítico AISI 316 por deposición química de vapor en lecho fluidizado (CVD-FBR), para luego ser tratado a 750 °C en argón por 2 horas. Esta muestra recubierta fue oxidada en un loop de vapor a 750 °C y presentó la velocidad de corrosión hasta 100 veces menor con respecto al substrato (acero) oxidado bajo las mismas condiciones. Con el propósito de investigar los beneficios del recubrimiento Al-Si-CVD-FBR sobre el sustrato sobre las propiedades mecánicas de las muestras oxidadas, se realizó estudios de microdureza y nanoindentación. Además, para investigar los cambios micro-estructurales de las muestras oxidadas se realizó análisis por medio de Microscopia Electrónica de Barrido (MEB) y para observar los cambios de la topografía, gradiente de rugosidad y detectar posibles fases formadas en función de la distancia recorrida del análisis de sección transversal de la muestra, se procedió hacer un estudio con el recorrido de la punta del cantiléver de un Microscopio de Fuerza Atómica y se encontró aumento en la dureza del recubrimiento respecto al sustrato y una relación con los barridos de fase del MFA

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Formation of aluminide coatings on Ni and austenitic 316 stainless steel by a low temperature FBCVD process

Cited by 10 publications

References 15 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

The kinetics and mechanical study of borided iron aluminide (FeAl)

Caracterización Mecánica De Recubrimientos De Aluminio-Silicio Depositados Por CVD-FBR Sobre El Acero Inoxidable Aisi 316 Y Oxidado en Vapor De Agua

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