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Riffard, F.; Buscail, Henri; Caudron, Éric; Cueff, R.; Issartel, Christophe; Perrier, S.

doi:10.1023/a:1019667825476

Cited by 54 publications

(38 citation statements)

References 13 publications

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“…On the contrary, a smooth alloy can accommodate the stress increase by plastic deformation and buckling of the oxide scale. Some authors have shown that an yttrium sol-gel coating promotes a continuous silica scale formation at the internal interface on the alloy AISI 304 [36]. The silicon presence hinders the iron oxidation and the formation of non-protective iron oxides [37].…”

Section: Discussionmentioning

confidence: 99%

Influence of Lanthanum Coatings on a Model 330 Alloy (Fe–35Ni–18Cr–2Si) Oxidation at High Temperatures

et al. 2013

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Abstract. The influence of a lanthanum sol-gel coating on the chromia scale adherence has been studied on the 330 alloy (Fe-35Ni-18Cr-2Si) oxidized at 900°C, in air. Argon annealing of lanthanum sol-gel coatings have been performed at various temperatures. Kinetic results show that lanthanum sol-gel coatings lead to a lower oxidation rate compared to blank specimens. On blank 330 specimens scale spallation is observed after cooling to room temperature. On the non-annealed sol-gel coated specimen and the argon annealed specimens at 600, 800 or 1000°C, the oxide scale formed at 900 °C is adherent after 48 hours isothermal oxidation. The adherent oxide scales are convoluted. It results from o an anionic and a cationic mixed diffusion process in the chromia scale Thermal cycling tests on lanthanum the sol-gel coated specimen show that the oxide scale remains adherent after 250 cycles. It is concluded that argon annealing of the lanthanum sol gel coating is not necessary to improve the scale adherence.

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Section: Discussionmentioning

confidence: 99%

Influence of Lanthanum Coatings on a Model 330 Alloy (Fe–35Ni–18Cr–2Si) Oxidation at High Temperatures

et al. 2013

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“…Si + 2HCl = SiH 4 + HCl DG 500 = 100 kJ, DG 550 = 105 kJ (9) Si + 2HCl = SiH 2 Cl 2 DG 500 = -45 kJ, DG 550 = -383 kJ (10) Si + 3HCl = SiHCl 3 + H 2 DG 500 = -197kJ, DG 550 = -113kJ…”

Section: Si +3hcl + H 2 = Sih 3 Cl+2hclunclassified

“…[8] With aluminizing, an iron aluminide coating is formed on the steel surface which has excellent oxidation and corrosion resistance, with lower rates of attack than ferritic heat resistant materials. [9] Iron aluminide coatings may be improved by using reactive elements because it is well known that a small addition of reactive element to several materials produces an improvement in their oxidation resistance at high temperatures [10] and beneficial effects have been observed on most chromia-and alumina-forming alloys. [11] On the other hand, coatings based on an iron-aluminide with silicon can provide an excellent oxidation and corrosion resistance at high temperature.…”

Section: Introductionmentioning

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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“…The limitations of coating application to improve the oxidation resistance of aluminaforming steels were previously described by Pint [3]. Nevertheless, the reasons why surface doping is inefficient in the case of alumina-forming steels, whereas they are beneficial to improve the oxidation resistance of chromia-forming alloys [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], are still unclear.…”

Section: Introductionmentioning

confidence: 99%

Influence of the mode of introduction of a reactive element on the high temperature oxidation behavior of an alumina-forming alloy. Part III: The use of two stage oxidation experiments and in situ X-ray diffraction to understand the oxidation mechanisms

Chevalier¹,

Issartel²,

Cueff³

et al. 2006

Materials and Corrosion

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International audienceThe aim of this work was to investigate several different yttrium introduction routes to improve the high temperature oxidation resistance of a Fe-20Cr-5Al model alloy. Y2O3 sol-gel coatings, Y2O3 metal-organic chemical vapor deposition (MOCVD) coatings, yttrium. ion implantation and yttrium as alloying element (0.1 wt.%) were the different methods of introduction of the reactive element. Both isothermal and cyclic oxidation tests showed that the surface introduction of yttrium or yttrium oxide did not drastically improve the oxidation behavior of the steel. Complementary experiments were performed to understand the lack of major beneficial effects of the so-treated samples. Two stage oxidation experiments under 200 mbar O-16(2) and O-18(2) followed by secondary neutral mass spectrometry (SNMS) were performed to understand the alumina scale growth mechanisms, according to the introduction route of the reactive element. The results exhibited that the yttrium induced an increase of the inward transport of oxygen through the alumina scale compared to the untreated specimen. Nevertheless, the outward transport of aluminum was generally observed, except for the specimen containing Y as alloying element, which exhibited only a single O-18 peak close to the metal/oxide interface. Phase transformations during the oxidation at 1100 degrees C were registered by in-situ X-ray diffraction (XRD). The untreated alloy was only covered by a thin layer of alpha-Al2O3. For implanted specimens, yttrium was incorporated in Y3Al5O12 and YAlO3 phases. All the YAlO3 is transformed into Y3Al5O12 after less than 10 h. For the MOCVD or the sol-gel coated samples, the primary formed YAlO3 phase was progressively transformed into Y3Al5O12. For the Fe-20Cr-5Al-0.1Y alloy, no yttrium containing phases could be detected, even after 40 h of oxidation test at 1100 degrees C

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Untitled

Cited by 54 publications

References 13 publications

Influence of Lanthanum Coatings on a Model 330 Alloy (Fe–35Ni–18Cr–2Si) Oxidation at High Temperatures

Influence of Lanthanum Coatings on a Model 330 Alloy (Fe–35Ni–18Cr–2Si) Oxidation at High Temperatures

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

Influence of the mode of introduction of a reactive element on the high temperature oxidation behavior of an alumina-forming alloy. Part III: The use of two stage oxidation experiments and in situ X-ray diffraction to understand the oxidation mechanisms

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