High‐Temperature Oxidation and Corrosion of Intermetallics

Brady, Michael P.; Pint, Bruce A.; Tortorelli, P.F.; Wright, I.G.; Hanrahan, Robert J.

doi:10.1002/9783527603978.mst0408

Cited by 8 publications

(2 citation statements)

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“…(1) As a consequence of the isothermal oxidation in the air at the temperature of 700°C and 800°C, on the alloy surface of the uncoated alloy a scale forms containing mainly 12 Isothermal section of the Ti-Al-O phase diagram after experimental data [28] …”

Section: Discussionmentioning

confidence: 99%

Oxidation Behavior of Al2O3 Coating on Ti-25Al-12.5Nb Alloy

Małecka

2016

J. of Materi Eng and Perform

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The oxidation behavior of Al 2 O 3 coating deposited on Ti-25Al-12.5Nb alloy by sol-gel method was investigated at 700 and 800°C under isothermal oxidation conditions in air. At both temperatures, the coated samples exhibited reduced mass gain compared to uncoated alloy; at 700°C rather insignificant differences were observed; however, at the temperature of 800°C, the deposited coating strongly limits the mass gain of the test material. As a consequence of the isothermal oxidation a scale forms containing mainly TiO 2 on the alloy surface of the uncoated alloy, while during the oxidation of the coated alloy the surface coating of Al 2 O 3 dissociated and the initially compact Al 2 O 3 coating dissolved and its place was taken by a porous scale. These coated samples displayed good resistance to oxidation in set conditions and no zones of dissolved oxygen and nitrogen were recorded. No spallation of the coated samples was observed.

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Section: Discussionmentioning

confidence: 99%

Oxidation Behavior of Al2O3 Coating on Ti-25Al-12.5Nb Alloy

Małecka

2016

J. of Materi Eng and Perform

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“…Forming a protective external alumina scale improves oxidation and hot corrosion resistance [10]. β-NiAl coatings have received a lot of attention because of their combination of desirable properties, including high melting temperature, as well as strong thermal conductivity [11,12]. Nickel-aluminum intermetallic alloys based on NiAl or Ni 3 Al have shown good resistance to high temperature oxidation [12,13].…”

Section: Introductionmentioning

confidence: 99%

Deposition of Aluminide Coatings onto AISI 304L Steel for High Temperature Applications

2022

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The nickel aluminides are commonly employed as a bond coat material in thermal barrier coating systems for the components of aeroengines operated at very high temperatures. However, their lifetime is limited due to several factors, such as outward diffusion of substrate elements, surface roughness at high temperatures, morphological changes of the oxide layer, etc. For this reason, inter-diffusion migrations were studied in the presence and absence of nickel coating. In addition, a hot corrosion study was also carried out. Thus, on one set of substrates, nickel electrodeposition was carried out, followed by a high activity pack aluminizing process, while another set of substrates were directly aluminized. The microstructural, mechanical, and oxidation properties were examined using different characterization techniques, such as SEM-EDS, optical microscopy, XRD, optical emission spectroscopy, surface roughness (Ra), and adhesion tests. In addition, the variable oxidation temperatures were employed to better understand their influence on the roughness, degree of spallation (DoS), and morphology. The results show that AISI 304L substrates do not respond to aluminizing treatment, i.e., no aluminide coating was formed; rather, a nearly pure aluminum (or alloy) was observed on the substrate. On the contrary, successful formation of an aluminide coating was observed on the nickel-electrodeposited substrates. In particular, a minimum amount of migrations were noted, which is attributed to nickel coating. Moreover, the scratch test at 10 N load revealed neither cracking nor peeling off, thereby indicating good adhesion of the aluminide coating before oxidation. The as-aluminized samples were oxidized between 700 °C to 1100 °C in air for 8 h each. The degree of spallation showed an incremental trend as temperatures increased. Likewise, oxide morphologies showed temperature dependence. On the other hand, average surface roughness (from Ra = 2.3 µm to 5.8 µm) was also increased as temperatures rose. Likewise, the mass gain showed linearity as temperatures increased during oxidation. The hot corrosion responses of electrodeposited-aluminized samples were superior among all specimens. An extensive discussion is presented based on the observations noted above.

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Handbook of Advanced Materials

Wessel¹

2004

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High‐Temperature Oxidation and Corrosion of Intermetallics

Abstract: The sections in this article are Introduction Oxidation Fundamentals Protective Oxide Scale Formation Reactive Elements Overview Effects on Oxidation Production of Alloys with RE Additions … Show more

Cited by 8 publications

References 356 publications

Oxidation Behavior of Al2O3 Coating on Ti-25Al-12.5Nb Alloy

Oxidation Behavior of Al2O3 Coating on Ti-25Al-12.5Nb Alloy

Deposition of Aluminide Coatings onto AISI 304L Steel for High Temperature Applications

Handbook of Advanced Materials

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