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Your search keyword '"Liu, Weimin"' showing total 35 results
Start Over Author "Liu, Weimin" Journal applied surface science
35 results on '"Liu, Weimin"'

33. Dependence of atomic oxygen resistance and the tribological properties on microstructures of WS2 films.

Author

Xu, Shusheng, Gao, Xiaoming, Hu, Ming, Sun, Jiayi, Jiang, Dong, Wang, Desheng, Zhou, Feng, Weng, Lijun, and Liu, Weimin

Subjects
*OXYGEN, *TRIBOLOGY, *THIN films, *ANTHOLOGY films, *COMPOSITE materials, *WEAR resistance
Abstract

Highlights: [•] Pure WS2 and WS2-Al composite films with different structures were prepared. [•] The compactness of WS2 film was significantly improved due to incorporation of Al. [•] Different mechanisms of atomic oxygen resistance of both the films were discussed. [•] Films before and after AO irradiation kept the unchanged tribological properties. [•] The composite films showed much better wear resistance than pure WS2 film. [Copyright &y& Elsevier]

Published
2014
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34. Nanostructured WS2–Ni composite films for improved oxidation, resistance and tribological performance.

Author

Xu, Shusheng, Gao, Xiaoming, Hu, Ming, Sun, Jiayi, Jiang, Dong, Zhou, Feng, Liu, Weimin, and Weng, Lijun

Subjects
*NANOSTRUCTURED materials, *TUNGSTEN compounds, *ANTHOLOGY films, *TRIBOLOGY, *DOPING agents (Chemistry), *METAL microstructure
Abstract

Highlights: [•] A novel kind of nanostructured WS2–Ni composite films was prepared. [•] The introduction of dopant Ni induced the microstructural change from loose columnar platelet structure with abundant inherent porosity to denser structure. [•] The WS2–Ni composite films exhibited better anti-oxidation capability compared with the pure WS2 film. [•] The suitable doping of Ni in the WS2 film induced film brittleness to a lesser extent, but was able to improve adhesion strength effectively. [•] The composite films with low Ni content (about 5.2at%) showed longer wear life and about sevenfold better than that of pure WS2 film in humid air. [Copyright &y& Elsevier]

Published
2014
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35. The effects of nanoscaled amorphous Si and SiN x protective layers on the atomic oxygen resistant and tribological properties of Ag film

Author

Hu, Ming, Gao, Xiaoming, Sun, Jiayi, Weng, Lijun, Zhou, Feng, and Liu, Weimin

Subjects
*AMORPHOUS silicon, *SILICON compounds, *OXYGEN, *SILVER, *THIN films, *MAGNETRON sputtering, *X-ray photoelectron spectroscopy
Abstract

Abstract: The Ag film, and double layer films of Ag/Si and Ag/SiN x were deposited by magnetron sputtering technique. The atomic oxygen (AO) irradiation tests were conducted using a ground AO simulation facility. The microstructure and composition of these films before and after AO irradiation tests were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), respectively, atomic force microscope (AFM) and scanning electron microscopy (SEM), respectively. Then the protective effects of nanoscaled amorphous Si and SiN x layers on the atomic oxygen resistant property of Ag film were investigated. The results show that nanoscaled Si or SiN x protective layer can provide better protection to Ag film against oxidation caused by AO irradiation. The silica layer formed on the surface of amorphous protective layers during AO exposure process plays the key role in protecting Ag film from oxidation. On the other hand, the tribological performance of Ag film and the multilayer films was comparatively studied using a ball-on-disc tribometer in vacuum condition. The tribotest results indicate that Ag/Si and Ag/SiN x films show the better lubricating performance before and after AO irradiation than pure Ag film. [Copyright &y& Elsevier]

Published
2012
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