Al effect in transport properties of nickel oxide and its relevance to the oxidation of nickel

Halem, N.; Abrudeanu, Mărioara; Petot-Ervas, G.

doi:10.1016/j.mseb.2011.05.035

Cited by 22 publications

(10 citation statements)

References 26 publications

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“…EDS analysis showed that oxides formed on the surface can be roughly classified into two types as marked by 1, 2 and 3. The black region (point 3) was mainly consisted of Al and O element, which is in accordance with the references: in superalloy with high contents of Cr, the continuous alumina film would form on the alloy surface when the content of Al is higher than 5% [17][18][19]. Whereas the Ni was rich in plate-like oxides which were randomly distributed on the surface (point 1), Ta and Hf were the major metallic constituents of the white isolated island particles (point 2).…”

Section: Oxide Morphology and Compositionsupporting

confidence: 89%

Oxidation Behavior of the Nickel-Based Superalloy DZ125 at 980 °C

Zhang

Cheng

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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The isothermal oxidation behavior of the nickel-based superalloy DZ125 was investigated at 980°C through SEM/EDX and XRD. The weight loss process exhibited three periods-initial, transient and steady stages, which correspond to the formation of three layers on the surface. The outer layer was composed of NiO, whereas the intermediate layer mainly consisted of spinels and was accompanied with Ta-rich oxide. Alumina was evident as the inner continuous layer close to the substrate. The first formation of alumina was responsible for the initial stage of weight loss, and the formation of NiO and intermediate layer may dramatically affect on the transient and steady stage, respectively. The oxide scales effect on growth mechanism was discussed.

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Section: Oxide Morphology and Compositionsupporting

confidence: 89%

Oxidation Behavior of the Nickel-Based Superalloy DZ125 at 980 °C

Zhang

Cheng

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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“…It was shown that Al doping increases the oxidation rate constant via an increased cation vacancy concentration above 1000 1C, but decreases it below 1000 1C, as caused by Al segregation to the grain boundaries. 4,42 Although there is a similar result for the Cr-Ni alloy below 1000 1C, 43 it is also reported that Cr increases the reaction rate constant of Ni below 1000 1C if the Cr concentration does not exceed the solubility limit. [44][45][46] The solubility limit of Cr in NiO is reported to be equal to B1-2% between 1000 and 1200 1C, and to be smaller at lower temperatures.…”

Section: Oxidation Kinetics Of Cr-doped Ni Filmsmentioning

confidence: 84%

“…The oxidation kinetics of metals has been studied intensively for pure metals as well as for alloys. [1][2][3][4][5][6][7][8] Great attention has been paid to decrease metal corrosion for engineering purposes in high-temperature applications. 9 Studies were mostly performed on bulk samples or thick metal films at relatively high temperatures (4500 1C).…”

Section: Introductionmentioning

confidence: 99%

The oxidation kinetics of thin nickel films between 250 and 500 °C

Unutulmazsoy

Merkle

Fischer

et al. 2017

Phys. Chem. Chem. Phys.

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The oxidation kinetics of thin polycrystalline Ni films is of fundamental interest as well as being relevant for potential applications. It was investigated between 250 and 500 °C for 10-150 nm thick films. Even for the thinnest films, oxidation was found to be diffusion controlled. The high density of grain boundaries in the formed NiO layer leads to a tracer diffusion coefficient that is higher than reported in the literature, indicating accelerated Ni diffusion along the grain boundaries. Cr segregation to the bottom interface in doped-NiO films hindered the acceleration of the oxidation of thin films.

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“…2g and 2h. However, a continuous aluminum oxide layer was not formed in this oxidation process, for the content of Al in GTD111 (2.8-3.2wt.%) was less than the threshold (at least 5-7wt.% Al) at 900°C [8,15,18]. When the oxidation temperature increased to 1100°C, Cr 2 O 3 oxide changed to gaseous CrO 3 and a continuous Al 2 O 3 layer formed as the outer oxide, and acted the most protection against oxidation [19].…”

Section: Experimental Methodsmentioning

confidence: 99%