One-dimensional γ-Al2O3 growth from the oxidation of NiAl

Zhu, Dingding; Wang, Xinli; Jia, Peng; Cai, Changqun; Huang, Jianyu; Zhou, Guangwen

doi:10.1016/j.corsci.2023.111069

Cited by 9 publications

(4 citation statements)

References 64 publications

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“…Spinel was composed of coarse grains with defects through which surface diffusion of oxygen and nitrogen into the sample could occur. In turn, the formation of Al 2 O 3 reduced the partial pressure of oxygen and impeded spinel formation [34]. A continuous Al 2 O 3 layer was located at the boundary between sublayers I and II, being responsible for the enhancement of oxidation resistance.…”

Section: Resultsmentioning

confidence: 99%

“…In the transitional MeN-Me layer, nitrogen reacted with aluminum to yield AlN nitrides, which also depleted NiAl to Ni 3 Al. Along with Ni 3 Al, the interaction between nitrogen and aluminum contributed to the formation of the MoNi intermetallic phase [34]. In order to assess the effect of thermo-vacuum treatment on high-temperature oxidation resistance, we analyzed the microstructure of the oxidized alloy with composition 2 that had undergone vacuum annealing (Figure 15).…”

Section: Resultsmentioning

confidence: 99%

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The Effect of Dopants on Structure Formation and Properties of Cast SHS Alloys Based on Nickel Monoaluminide

et al. 2023

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Alloys based on NiAl-Cr-Co (base) with complex dopants (base+2.5Mo-0.5Re-0.5Ta, base+2.5Mo-1.5Re-1.5Ta, base+2.5Mo-1.5Ta-1.5La-0.5Ru, base+2.5Mo-1.5Re-1.5Ta-0.2Ti, base+2.5Mo-1.5Re-1.5Ta-0.2Zr) were fabricated by centrifugal SHS metallurgy. The phase and impurity compositions, structure, mechanical properties, and the mechanism of high-temperature oxidation at T = 1150 °C were studied; the kinetic oxidation curves, fitting equations and parabolic rate constant were plotted. Al2O3 and Co2CrO4 were the major phases of the oxidized layer. Three layers were formed: I—the continuous Al2O3 layer with Co2CrO4 inclusions; II—the transitional MeN-Me layer with AlN inclusions; and III—the metal layer with AlN inclusions. The positive effect of thermo-vacuum treatment (TVT) on high-temperature oxidation resistance of the alloy was observed. The total weight gain by the samples after oxidative annealing decreased threefold (from 120 ± 5 g/m2 to 40 ± 5 g/m2). The phases containing Ru and Ti microdopants, which reduced the content of dissolved nitrogen and oxygen in the intermetallic phase to the values ∑O, N = 0.0145 wt.% for the base+2.5Mo-1.5Ta-1.5La-0.5Ru alloy and ∑O,N = 0.0223 wt.% for the base+2.5Mo-1.5Re-1.5Ta-0.2Ti alloy, were identified by transmission electron microscopy (TEM). In addition, with the significant high-temperature oxidation resistance, the latter alloy with Ti had the optimal combination of mechanical properties (σucs = 1644 ± 30 MPa; σys = 1518 ± 25 MPa).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The Effect of Dopants on Structure Formation and Properties of Cast SHS Alloys Based on Nickel Monoaluminide

et al. 2023

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“…04-0880; Figures 1c and S1). 44 In addition, the Ni (111) grain size of the samples was calculated according to Scherrer's formula (S2), and it can be found that the addition of Al affects the grain size of the xNi-Al 2 O 3 /CN samples. 1).…”

Section: Structural Characterization 311 Effect Of Al Content On Stru...mentioning

confidence: 99%

Ni–Al₂O₃/CN Nanocatalysts for Selective Hydrogenation of Furfural

Yang,

Dao,

et al. 2024

ACS Appl. Nano Mater.

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Cheap Ni catalysts are highly active for the catalytic conversion of biomass, but it is challenging to prepare Ni-based catalysts with high selectivity and stability under mild conditions. Adjusting the adsorption strength of Ni catalysts to reaction substrates and intermediates by metal introduction is an effective strategy to achieve high yields of products. In this paper, a series of xNi-Al 2 O 3 /CN catalysts were prepared by introducing Al content as a variable and were used for hydrogenation of furfural (FAL) to tetrahydrofurfuryl alcohol (THFOL). Under the mild condition of 90 °C, the yield of the 3Ni−Al 2 O 3 /CN catalyst with the optimal Ni/Al ratio of 3:1 reached 99.9%, which was 8.3 times that of Ni/ CN without Al. The improvement in the catalytic performance was mainly attributed to the enhanced interaction of Ni and Al 2 O 3 by Al introduction, which increased the content of active Ni 0 and Lewis acid. This not only promoted the adsorption and activation of H 2 and FAL but also increased the adsorption strength of 3Ni−Al 2 O 3 /CN on the intermediate FOL to improve THFOL selectivity. The correlation between the modulation of Al content and catalytic performance was explored in detail through relevant characterization and theoretical calculations. In addition, Al-introduced 3Ni−Al 2 O 3 /CN maintained high stability over 10 cycles relative to the rapid deactivation of Ni/CN, which was attributed to the strong interaction of Ni−Al 2 O 3 . This strategy to modulate the activation ability of the catalyst provides a reference for the logical design of efficient bifunctional metal catalysts.

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“…Thereafter, the structures of the newly formed phases on the surface and at the grain boundary were investigated via transmission electron microscopy (TEM 200 kV FEI Tecnai G2 F20). The TEM samples were prepared using a focused ion beam (FIB, ZEISS Crossbeam 540) [20].…”

Section: 2microstructure and Characterisationmentioning

confidence: 99%

Effects of different carbides content and brazing process on the electrochemical behaviour of vacuum brazed WC-10Ni+NiCrBSi coatings

Zhu,

Liu,

Yuan

et al. 2023

Phys. Scr.

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This study prepared a WC-10Ni/NiCrBSi composite coating on Q235 steel employing flexible coating cloth and vacuum brazing technologies. The surface hardness and corrosion resistance of the coating were characterised by the Vickers hardness, electrochemical, and micro-electrochemical tests. The results show that the corrosion resistance of the coating improved with the increase in cladding temperature. Moreover, with the increase in WC-10Ni content, the corrosion resistance of the coating decreased. Through transmission electron microscopy, scanning electron microscopy, and energy dispersive spectroscopy analysis, it is shown that there is galvanic corrosion in the micro-zone corrosion, where the WC particles are protected as cathodes, and the hardness of the coating is not affected by electrochemical behaviour. Thus, the hardness of the coating is not affected when it is applied in a corrosive environment.

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One-dimensional γ-Al2O3 growth from the oxidation of NiAl

Cited by 9 publications

References 64 publications

The Effect of Dopants on Structure Formation and Properties of Cast SHS Alloys Based on Nickel Monoaluminide

The Effect of Dopants on Structure Formation and Properties of Cast SHS Alloys Based on Nickel Monoaluminide

Ni–Al₂O₃/CN Nanocatalysts for Selective Hydrogenation of Furfural

Effects of different carbides content and brazing process on the electrochemical behaviour of vacuum brazed WC-10Ni+NiCrBSi coatings

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One-dimensional γ-Al2O3 growth from the oxidation of NiAl

Cited by 9 publications

References 64 publications

The Effect of Dopants on Structure Formation and Properties of Cast SHS Alloys Based on Nickel Monoaluminide

The Effect of Dopants on Structure Formation and Properties of Cast SHS Alloys Based on Nickel Monoaluminide

Ni–Al2O3/CN Nanocatalysts for Selective Hydrogenation of Furfural

Effects of different carbides content and brazing process on the electrochemical behaviour of vacuum brazed WC-10Ni+NiCrBSi coatings

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Ni–Al₂O₃/CN Nanocatalysts for Selective Hydrogenation of Furfural