Study of oxyhydroxides formation on P91 ferritic steel and slurry coated by Al in contact with Ar+80%H2O at 650 °C by TG-Mass spectrometry

Pérez, F.J.; Castañeda, S. I.

doi:10.1016/j.surfcoat.2006.11.029

Cited by 27 publications

(25 citation statements)

References 15 publications

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“…The effects of water vapor on the oxidation behavior and mechanical properties of intermetallics have not been extensively studied [29][30][31][32]. Zeller et al [29] found that water vapor causes a significant increase in the oxidation kinetics accompanied by a change in the microstructure and morphology of the oxide layer in TiAl alloys.…”

Section: Introductionmentioning

confidence: 99%

“…Pint et al [31] observed an increase in the level of spallation in NiAl intermetallics with increasing water vapor content, particularly if they do not contain small amounts of elements such as Y or Hf. Pérez et al [30] studied the effect of iron aluminide coatings on ferritic steels. The presence of the coating delayed the degradation of the steel by preventing the formation of Cr-containing volatile species.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…Over the last 15 years, efforts were made to explain the accelerating effect of water vapour on the oxidation kinetics. Oxidation experiments were carried out at temperatures between 550°C and 800°C in humidified mixtures of nitrogen and 1-2% oxygen [1,2], in humidified air [3][4][5][6][7], in humidified argon [8][9][10][11][12][13][14] and in pure water vapour [15]. The water vapour content of the gas in those reported experiments varied between 2% and 100%.…”

mentioning

confidence: 99%

“…The water vapour content of the gas in those reported experiments varied between 2% and 100%. Generally, the investigated samples were flat and the surface condition was either ground or polished prior to oxidation [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

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confidence: 99%

Oxidation of X20 in Water Vapour: The Effect of Temperature and Oxygen Partial Pressure

2009

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The oxidation behaviour of X20 in various mixtures of water, oxygen, and hydrogen was investigated at temperatures between 500°C and 700°C (time: 336 h). The samples were characterised using reflected light microscopy and scanning electron microscopy equipped with energy dispersive spectroscopy. Double-layered oxides developed during oxidation under all conditions. The morphology of the oxide layers was strongly influenced by temperature, whereas the influence of the oxidising environment appeared to be less pronounced, as long as it contained water vapour. The inner layer consisted of converted M 23 C 6 embedded in Fe-Cr spinel after oxidation at 500 and 600°C, while alternating layers of Cr-rich and Cr-poor oxide were observed after oxidation at 700°C. An internal oxidation zone developed during oxidation at 500 and 600°C, with its depth influenced by the oxidising environments. The results are discussed based on the various hypotheses of the accelerating effect of water vapour that have been put forth in the literature.

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“…The coatings were treated thermally to form layers or iron aluminides (intermetallic compounds) on the respective steel, responsible for protection against steam oxidation, because they act as a source of aluminum for the formation of alumina (Al 2 O 3 ), upon contact with steam during oxidation. Due to the high melting point of alumina, this protective layer prevents the volatilization of chromium during steel oxidation, in the form of oxides, hydroxides and chromium oxyhydroxides, which are volatile species that have been reported in other papers (Ebbinghaus, 1993;Asteman, Svensson & Johansson, 2002;Pérez & Castañeda, 2007). In austenitic steel without aluminum coating, oxidation accelerates at 700ºC due to the presence of steam, forming major crusts or islands of iron oxides, among which wustite (FeO) is the most harmful.…”

Section: Introductionmentioning

confidence: 97%

Behavior of aluminium coating by CVD-FBR in steam oxidation at 700°C

Marulanda-Arévalo

Pérez-Trujillo

Castañeda-Quintana

2014

CT&F Cienc. Tecnol. Futuro

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A luminum coatings have been obtained using the Chemical Vapor Deposition of Fluidized Bed Reactor technique (CVD-FBR), on austenitic stainless steels (AISI 304, AISI 316 and AISI 317), in order to evaluate resistance to steam oxidation at 700ºC. The coatings were characterized in their morphology/ composition and crystalline phases using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDAX) and X-ray Diffraction (XRD). In addition, thermodynamic simulation was performed using Thermo-Calc ® software to make the deposition of the coating on said steels similar to optimal conditions. All specimens -with and without aluminum coating by CVD-FBR-were oxidized at 700ºC, in a steam atmosphere of nearly 100% for 1000 h. The aluminum coating prevented the formation of oxide islands or crust, and reduced steel mass gain. Coated AISI steel showed a 25% reduction in mass gain compared to the same steel uncoated and oxidized under the same conditions. AISI 316 and AISI 317 steels underwent loss of mass because the brittle oxide that was formed came loose. 76F oram obtidos recobrimentos de alumínio pela técnica de deposição química de vapor por leito fluidizado (CVD-FBR por suas siglas em inglês), sobre aços inoxidáveis austeníticos (AISI 304, AISI 316 e AISI 317), com o propósito de avaliar a resistência à oxidação em vapor d'água a 700ºC. Os recobrimentos foram caracterizados em sua morfologia/composição e fases cristalinas mediante as técnicas de Microscopia Eletrônica de Varredura (MEB), com análise de raios X por dispersão de energia (EDAX por suas siglas em inglês) e Difração de Raios X (DRX). Além disso, foi realizada simulação termodinâmica mediante o software comercial Thermo-Calc ® , com a finalidade de aproximar às condições ótimas a deposição do recobrimento sobre os mencionados aços. Todos os espécimes, sem e com recobrimento de alumínio por CVD-FBR, foram oxidados à temperatura de 700ºC, em uma atmosfera próxima a 100% de vapor d'água por 1000 h. O recobrimento de alumínio evitou a formação de ilhas ou camada de óxidos e diminuiu o ganho de massa dos aços. O aço AISI 304 com recobrimento apresentou uma redução de 25% no ganho de massa em comparação com o mesmo aço sem recobrimento e oxidado nas mesmas condições; os aços AISI 316 e AISI 317 apresentaram perda de massa, devido a que o óxido formado se solta por sua natureza quebradiça. Se han obtenido recubrimientos de aluminio por la técnica de deposición química de vapor por lecho fluidizado (CVD-FBR de sus siglas en inglés), sobre aceros inoxidables austeníticos (AISI 304, AISI 316 y AISI 317), con el propósito de evaluar la resistencia a la oxidación en vapor de agua a 700ºC. Los recubrimientos fueron caracterizados en su morfología/composición y fases cristalinas mediante las técnicas de Microscopía Electrónica de Barrido (MEB), con análisis de rayos X por dispersión de energía (EDAX de sus siglas en ingles) y Difracción de Rayos X (DRX). Además, se realizó simulación termodinámica mediante el software comercial Thermo-Calc ® , con la f...

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Study of oxyhydroxides formation on P91 ferritic steel and slurry coated by Al in contact with Ar+80%H2O at 650 °C by TG-Mass spectrometry

Cited by 27 publications

References 15 publications

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

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

Oxidation of X20 in Water Vapour: The Effect of Temperature and Oxygen Partial Pressure

Behavior of aluminium coating by CVD-FBR in steam oxidation at 700°C

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Study of oxyhydroxides formation on P91 ferritic steel and slurry coated by Al in contact with Ar+80%H2O at 650 °C by TG-Mass spectrometry

Cited by 27 publications

References 15 publications

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

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

Oxidation of X20 in Water Vapour: The Effect of Temperature and Oxygen Partial Pressure

Behavior of aluminium coating by CVD-FBR in steam oxidation at 700°C

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

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