Phase transformation behavior of alumina grown on FeAl alloys with reactive element dopants at 1273 K

Li, Dongqing; Zhou, Lei; Xi, Y. J.; Liu, Long; Liu, Zhen; Si, Jiajun; Zhu, Kun Yan

doi:10.1016/j.jallcom.2016.09.092

Cited by 20 publications

(5 citation statements)

References 40 publications

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“…For Pd@ZrO 2 /Al 2 O 3 catalyst, the dominative phase was α-Al 2 O 3 (91.4 wt %) with a small amount of θ-Al 2 O 3 . It suggested that the nanoparticles (CeO 2 , Ce 0.5 Zr 0.5 O 2 , and ZrO 2 ) in shells suppressed the formation of θ-Al 2 O 3 and enhanced the nucleation of α-Al 2 O 3 , consistent with the previous reports. , …”

Section: Resultsmentioning

confidence: 96%

“…In all the cases, the diffraction patterns of the catalysts were assigned to γ-Al suppressed the formation of θ-Al 2 O 3 and enhanced the nucleation of α-Al 2 O 3 , consistent with the previous reports. 33,34 In order to further confirm the phase composition of samples, the XRD data of samples were analyzed by Rietveld refinement technique using the HighScore Plus program. The details of the quantitative phase analysis are displayed in the Supporting Information.…”

Section: Acs Catalysismentioning

confidence: 99%

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Hydrothermal Stability of Core–Shell Pd@Ce_0.5Zr_0.5O₂/Al₂O₃ Catalyst for Automobile Three-Way Reaction

Li¹,

Zhang²,

Huang³

et al. 2018

ACS Catal.

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In this paper, the hydrothermal stability and catalytic activity of Pd@Ce0.5Zr0.5O2/Al2O3 catalyst with a core–shell structure were investigated for automobile three-way reactions and compared with those of Pd/Al2O3, Pd@CeO2/Al2O3, and Pd@ZrO2/Al2O3 catalysts. TEM, HRTEM, and EDS mapping analyses showed that the core–shell structure of Pd@Ce0.5Zr0.5O2 nanoparticles was intact after the hydrothermal treatment at 1050 °C for 5 h. Meanwhile, CO–DRIFT results suggested that the interface of Pd core and Ce0.5Zr0.5O2 shell acted as the active sites in the reaction of three-way catalysts. Additionally, XPS, FT-IR, and CO–DRIFT analyses demonstrated that a large amount of OH groups were present on the surface of Pd@Ce0.5Zr0.5O2/Al2O3 catalyst, which could accelerate the decomposition of carbonate species and reduce the activation energy of the catalytic reaction. This was an important reason for the Pd@Ce0.5Zr0.5O2/Al2O3 catalyst to keep the high catalytic activity after aging at high temperature.

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Section: Resultsmentioning

confidence: 96%

Section: Acs Catalysismentioning

confidence: 99%

Hydrothermal Stability of Core–Shell Pd@Ce_0.5Zr_0.5O₂/Al₂O₃ Catalyst for Automobile Three-Way Reaction

Li¹,

Zhang²,

Huang³

et al. 2018

ACS Catal.

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“…The Gibbs energy of Dy 2 O 3 is the lowest, suggesting the highest activity of the rare earth element of Dy. Apart from Dy, it is now well established that small additions of reactive elements (typically 0.01-0.5 wt%), e.g., Y, Hf, La and Ce, generate pronounced effects on the oxidation resistance of alloys and coatings [33][34][35][36]. A number of investigations have reported small additions of reactive elements resulted in a better adherence and a reduced growth kinetics of protective alumina-and chromia-based surface scales, by strengthening the mechanical interlocking of the scale through the formation of oxide pegs at the scale/alloy interface [37][38][39] or changing growth mechanism of oxides resulting in reduced growth stresses [36,40].…”

Section: Discussionmentioning

confidence: 99%

Microstructure and High-Temperature Oxidation Behavior of Dy-Doped Nb–Si-Based Alloys

Guo

Zhang

Kong

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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Microstructures and oxidation behaviors of four Dy-doped Nb-Si-based alloys at 1250°C were investigated. The nominal compositions of the four alloys are Nb-15Si-24Ti-4Cr-2Al-2Hf-xDy (at.%), where x = 0, 0.05, 0.10 and 0.15, respectively. Results showed that the four alloys all consisted of Nbss, aNb 5 Si 3 and cNb 5 Si 3 , and the addition of Dy produced no obvious effect on the phase constitution and the microstructures of Nb-Si-based alloys. After oxidation at 1250°C for 58 h, it was found that the addition of Dy accelerated the oxidation rate of Nb-Si-based alloys and caused a larger weight gain, accompanied by the formation of a more porous and less protective oxide scale. The oxides of Nb 2 O 5 , Ti 2 Nb 10 O 29 , TiNb 2 O 7 , Ti 0.4 Cr 0.3 Nb 0.3 O 2 and glassy SiO 2 were formed on Dy-doped Nb-Si-based alloys. The hightemperature oxidation mechanism of Dy-doped Nb-Si-based alloys was discussed.

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“…[11][12][13][14] A water vapor environment is inevitable in high-temperature industrial fields, and the water vapor atmosphere affects the adhesion of the oxide scale, detaching it and leading to secondary oxidation. Therefore, FeCrAl alloys are doped with rare-earth elements (REs) because adding RE inhibits the outward diffusion of Al, [9,11,15,16] adsorbs sulfur and carbon elements, [17,18] and strengthens the bonding at the alloy/scale interface. [19] This can further enhance the creep, shedding, and oxidation resistance of the metal.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sc on the Water Vapor Oxidation Behavior of FeCrAl Alloys at 1000 °C

Yang,

Sun,

Liu

et al. 2024

Adv Eng Mater

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This study analyzes the oxidation behavior of FeCrAl–(0.0, 0.5, 1.0, 2.0, and 4.0) wt% Sc alloys prepared through vacuum hot‐press sintering in a water vapor environment. Sc diffuses via short‐circuit diffusion from the oxide scale/alloy interface to the oxide scale surface. Subsequently, Sc is segregated at the aluminum oxide scale interface, preventing Al ions from diffusing outward to combine with the oxygen in the water vapor and reducing the growth rate of the oxide scale. Compared to a pure oxygen atmosphere, the water vapor atmosphere affects the adhesion of the oxide scale, shedding the oxide scale and leading to secondary oxidation. Sc doping transforms the oxide scale from a state of easily curved, poorly bonded, and full voids into a flat, bonded, dense, and protective scale. A dopant content of 0.5 wt% Sc is low and has a minor effect on the oxidation resistance of FeCrAl alloys. Samples containing 2.0 and 4.0 wt% Sc are excessively doped, causing considerable internal oxidation. In this experiment, 1.0 wt% Sc doping is found to be the most appropriate, demonstrating a low mass gain of 2.59 ± 0.12 mg cm−2 and a slow oxidation rate (K p = 0.7131 mg cm−2 · h n ).

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Phase transformation behavior of alumina grown on FeAl alloys with reactive element dopants at 1273 K

Cited by 20 publications

References 40 publications

Hydrothermal Stability of Core–Shell Pd@Ce_0.5Zr_0.5O₂/Al₂O₃ Catalyst for Automobile Three-Way Reaction

Hydrothermal Stability of Core–Shell Pd@Ce_0.5Zr_0.5O₂/Al₂O₃ Catalyst for Automobile Three-Way Reaction

Microstructure and High-Temperature Oxidation Behavior of Dy-Doped Nb–Si-Based Alloys

Effect of Sc on the Water Vapor Oxidation Behavior of FeCrAl Alloys at 1000 °C

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Phase transformation behavior of alumina grown on FeAl alloys with reactive element dopants at 1273 K

Cited by 20 publications

References 40 publications

Hydrothermal Stability of Core–Shell Pd@Ce0.5Zr0.5O2/Al2O3 Catalyst for Automobile Three-Way Reaction

Hydrothermal Stability of Core–Shell Pd@Ce0.5Zr0.5O2/Al2O3 Catalyst for Automobile Three-Way Reaction

Microstructure and High-Temperature Oxidation Behavior of Dy-Doped Nb–Si-Based Alloys

Effect of Sc on the Water Vapor Oxidation Behavior of FeCrAl Alloys at 1000 °C

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Hydrothermal Stability of Core–Shell Pd@Ce_0.5Zr_0.5O₂/Al₂O₃ Catalyst for Automobile Three-Way Reaction

Hydrothermal Stability of Core–Shell Pd@Ce_0.5Zr_0.5O₂/Al₂O₃ Catalyst for Automobile Three-Way Reaction