TY - JOUR
T1 - Morphology evolution of Ag alloyed WS2 films and the significantly enhanced mechanical and tribological properties
AU - Xu, Shusheng
AU - Gao, Xiaoming
AU - Hu, Ming
AU - Sun, Jiayi
AU - Wang, Desheng
AU - Zhou, Feng
AU - Weng, Lijun
AU - Liu, Weimin
PY - 2014/1/15
Y1 - 2014/1/15
N2 - The WS2-Ag composite films were prepared by radio frequency co-sputtering method. The effects of alloying Ag content on composition, microstructure, mechanical properties and friction behaviors have been analyzed by X-ray photoelectron spectroscopy (XPS), grazing incidence X-ray diffraction (GIXRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS) and high resolution transmission electron microscope (HRTEM), scratch tester, nano-indentation tester and ball-on-disk tribo-tester. The Ag addition was in present of nanocrystalline phase in the boundary of the crystalline WS2 matrix and induced morphology change, but could not completely prevent the columnar platelets. The columnar platelet was composed of a great deal of nanocrystalline and a small amount of amorphous WS2 phase. There were no substantial variations in the hardness of the composite films when the Ag content was in the range of 0-20.3at.%. The suitable amount of Ag content was benefited for improving the film adhesive strength and wear resistance both in vacuum and humid air environment. Particularly, the composite film with 9.0at.% Ag exhibited the longest wear life (about 7.6×105cycles in vacuum, 6.7×105cycles in humid air) under high Hertzian contact pressure (as high as 1.0GPa). The wear mechanism was discussed in terms of the rearrangement of wear track and formation of transfer film.
AB - The WS2-Ag composite films were prepared by radio frequency co-sputtering method. The effects of alloying Ag content on composition, microstructure, mechanical properties and friction behaviors have been analyzed by X-ray photoelectron spectroscopy (XPS), grazing incidence X-ray diffraction (GIXRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS) and high resolution transmission electron microscope (HRTEM), scratch tester, nano-indentation tester and ball-on-disk tribo-tester. The Ag addition was in present of nanocrystalline phase in the boundary of the crystalline WS2 matrix and induced morphology change, but could not completely prevent the columnar platelets. The columnar platelet was composed of a great deal of nanocrystalline and a small amount of amorphous WS2 phase. There were no substantial variations in the hardness of the composite films when the Ag content was in the range of 0-20.3at.%. The suitable amount of Ag content was benefited for improving the film adhesive strength and wear resistance both in vacuum and humid air environment. Particularly, the composite film with 9.0at.% Ag exhibited the longest wear life (about 7.6×105cycles in vacuum, 6.7×105cycles in humid air) under high Hertzian contact pressure (as high as 1.0GPa). The wear mechanism was discussed in terms of the rearrangement of wear track and formation of transfer film.
KW - Ag addition
KW - Microstructure
KW - Tribological properties
KW - WS film
UR - http://www.scopus.com/inward/record.url?scp=84890856215&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2013.10.074
DO - 10.1016/j.surfcoat.2013.10.074
M3 - 文章
AN - SCOPUS:84890856215
SN - 0257-8972
VL - 238
SP - 197
EP - 206
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -