2 clusters turned into smaller grains;the friction-coefficient decreased from 0.26 to 0.2;the interfacial adhesion decreased;the hardness changed in an increase-decrease manner,peaking at 1:9 and the wear-rate was 1/3 1/4 of that of WS2 film.Synthesized at 1:39,the coating has friction coefficient of 0.26,wear-rate of 9.8×10-14 m3/Nm and the strongest wear-resistance." />
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Microstructures and Tribological Properties of WS_x/a-C Multilayered Films with Various Layer Thickness Ratios
Author(s): 
Pages: 659-665
Year: Issue:  6
Journal: Chinese Journal of Vacuum Science and Technology

Keyword:  WS 2a-CMultilayer filmFriction and wearMagnetron sputtering;
Abstract: The WS2/a-C multilayered coatings(A≈50 nm) were prepared by alternative magnetron sputtering.The impact of the layer thickness-ratio(La-C/LWSx) on the microstructures and tribological properties of the coatings in air(RH≈70%)was investigated with X-ray diffraction,X-ray photoelectron spectroscopy,energy dispersive spectroscopy,scanning electron microscopy,Raman spectroscopy,and conventional mechanical probes.The results show that the thickness-ratio strongly affects the mechanical behavior of the coatings.For example,as the thickness-ratio increased,the stoichiometric ratio(ns/nw) increased from 1.38 to 1.62,accompanied by increasingly improved compactness and surface flatness,because the "myriapoda-shaped" WS2 clusters turned into smaller grains;the friction-coefficient decreased from 0.26 to 0.2;the interfacial adhesion decreased;the hardness changed in an increase-decrease manner,peaking at 1:9 and the wear-rate was 1/3 1/4 of that of WS2 film.Synthesized at 1:39,the coating has friction coefficient of 0.26,wear-rate of 9.8×10-14 m3/Nm and the strongest wear-resistance.
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