Influence of the mode of introduction of a reactive element on the high temperature oxidation behavior of an alumina‐forming alloy. Part I: Isothermal oxidation tests

Chevalier, S.; Strehl, G.; Buscail, Henri; Borchardt, G.; Larpin, J.P.

doi:10.1002/maco.200303748

Cited by 13 publications

(12 citation statements)

References 57 publications

(23 reference statements)

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“…The same effect was observed already in a previous study which used Y + ion implantation or sol-gel or MOCVD coatings as the introduction route for yttrium in Fe-Cr-Al alloys. [73][74][75] The aluminized diffusion coatings seem to be efficient in producing alumina scales. Even in the case of spallation, the Al reservoir appears high enough to guarantee growth of an alumina scale.…”

Section: Discussionmentioning

confidence: 98%

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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Section: Discussionmentioning

confidence: 98%

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

2006

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“…This is particularly true for reactive-element addition, whose effect on the high-temperature corrosion of alumina-forming materials was largely studied [16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Water vapor effect on high-temperature oxidation behavior of Fe₃Al intermetallics

Chevalier

Juzoń

Przybylski

et al. 2009

Science and Technology of Advanced Materials

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Nb) were oxidized at 950• C in dry and humid (11 vol% water) synthetic air. Thermogravimetric measurements showed that the oxidation rates of the tested intermetallics were lower in humid air than in dry air (especially for Fe 3 Al-Zr,Mo and Fe 3 Al-Zr,Mo,Nb). The addition of small amounts of Zr, Mo or Nb improved the kinetics compared with that of the undoped Fe 3 Al. Fe 3 Al showed massive spallation, whereas Fe 3 Al-Zr, Fe 3 Al-Zr,Mo and Fe 3 Al-Zr,Mo,Nb produced a flat, adherent oxide layer. The rapid transformation of transient alumina into alpha alumina may explain the decrease in the oxidation rate in humid air.

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“…The introduction methods and the characterisation of the starting materials were described in Part I of this work [1].…”

Section: Methodsmentioning

confidence: 99%

“…No yttrium containing phases could be detected even from the beginning of the oxidation experiments. But it was previously observed that no crystallised phases were formed during the sol-gel process [1]. aAl 2 O 3 grew after 1 h and developed until the end of the oxi- For implanted specimens, the in situ XRD results are reported on Fig.…”

Section: In Situ High Temperature X-ray Diffraction Studiesmentioning

confidence: 99%

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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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Influence of the mode of introduction of a reactive element on the high temperature oxidation behavior of an alumina‐forming alloy. Part I: Isothermal oxidation tests

Cited by 13 publications

References 57 publications

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

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

Water vapor effect on high-temperature oxidation behavior of Fe₃Al intermetallics

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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Influence of the mode of introduction of a reactive element on the high temperature oxidation behavior of an alumina‐forming alloy. Part I: Isothermal oxidation tests

Cited by 13 publications

References 57 publications

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

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

Water vapor effect on high-temperature oxidation behavior of Fe3Al intermetallics

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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Water vapor effect on high-temperature oxidation behavior of Fe₃Al intermetallics