Oxidation of epitaxial Nb(110) films on a-plane sapphire substrates: An x-ray study

Hellwig, Olav; Song, Guang‐Ling; Zabel, H.; Becker, Hans‐Werner; Birkner, Alexander

doi:10.1002/1521-4052(200009)31:9<856::aid-mawe856>3.0.co;2-p

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…Studies have reported that the oxidation temperature of Nb and NbS 2 is slightly lower than that of the lubricating phase WS 2 . 42,43 which is consistent with the TG data in Figure 12. Unlike in the pure WS 2 or WSN coatings, the Nb and its sulfides in the WSNb coatings are preferentially combined with oxygen to be oxidized; thus the oxidation of WS 2 lubricating phase is delayed.…”

Section: Coatings Nanoindentation and Friction Behavior Of The Worn S...supporting

confidence: 90%

Improving the lubrication of WSNb nanocomposite coatings by the in-situ oxygen shielding effect at elevated temperatures: A combined study with density functional theory simulations

Zhu

Zeng

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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In order to improve the lubrication performance of the WS2-based coatings at elevated temperature, the mechanisms of enhancing the tribological performance of WSNb coatings at elevated temperatures are investigated. The WSNb coating doped with 11.9 at.% Nb exhibited excellent anti-friction and wear resistance, achieved a low coefficient of friction of 0.02 at 400 °C, and its wear resistance was much better than that of WS2-based coatings. The Nb metal and its sulfide in the coating are more sensitive to oxygen than WS2 at 400 °C, which reduces the oxygen concentration between the friction pairs and protects the WS2 lubricating phase from being oxided. In addition, Nb enhances the hardness and Young's modulus of the coatings through the solid solution strengthening effect, generating a more continuous and stable lubricating film during the silding process. First-principles calculation results demonstrated that the Nb spontaneously forms Nb-S bonds with S atoms in the coating. The molecular details of the Nb-S formation have been investigated in depth.

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Section: Coatings Nanoindentation and Friction Behavior Of The Worn S...supporting

confidence: 90%

Improving the lubrication of WSNb nanocomposite coatings by the in-situ oxygen shielding effect at elevated temperatures: A combined study with density functional theory simulations

Zhu

Zeng

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…A similar Nb layer was used as a capping layer to prevent atmospheric attack of the multilayer after growth. A study of epitaxial (110) Nb films on sapphire has found that a stable layer of Nb 2 O 5 about 20 Å thick is formed, which provides effective long-term passivation [11].…”

Section: Fabricationmentioning

confidence: 99%

A study of uranium-based multilayers: I. Fabrication and structural characterization

Springell

Zochowski

Ward

et al. 2008

J. Phys.: Condens. Matter

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This paper addresses the structural characterisation of a series of U/Fe, U/Co and U/Gd multilayers. X-ray reflectivity has been employed to investigate the layer thickness and roughness parameters along the growth direction and highangle diffraction measurements have been used to determine the crystal structure and orientation of the layers. For the case of uranium/transition metal systems, the interfaces are diffuse (∼ 17Å) and the transition metals are present in a polycrystalline form of their common bulk phases with a preferred orientation along the closest packed planes; Fe, bcc (110) and Co, hcp (001), respectively. The uranium is present in a poorly crystalline orthorhombic, α-U state. In contrast, the U/Gd multilayers have sharp interfaces with negligible intermixing of atomic species, and have a roughness, which is strongly dependent on the gadolinium layer thickness. Diffraction spectra indicate a high degree of crystallinity in both U and Gd layers with intensities consistent with the growth of a novel hcp U phase, stabilised by the hcp gadolinium layers.

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The improved thermal radiation property of SiC doped microarc oxidation ceramic coating formed on niobium metal for metal thermal protective system

Wang

Zhang

et al. 2017

Surface and Coatings Technology

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Oxidation of epitaxial Nb(110) films on a-plane sapphire substrates: An x-ray study

Cited by 6 publications

References 6 publications

Improving the lubrication of WSNb nanocomposite coatings by the in-situ oxygen shielding effect at elevated temperatures: A combined study with density functional theory simulations

Improving the lubrication of WSNb nanocomposite coatings by the in-situ oxygen shielding effect at elevated temperatures: A combined study with density functional theory simulations

A study of uranium-based multilayers: I. Fabrication and structural characterization

The improved thermal radiation property of SiC doped microarc oxidation ceramic coating formed on niobium metal for metal thermal protective system

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