Abstract
VCN–Cu films with different Cu contents were deposited by reactive magnetron sputtering technique. The films were evaluated in terms of their microstructure, elemental composition, mechanical, and tribological properties by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), high resolution transmission electron microscopy (HR-TEM), Raman spectrometry, nano-indentation, field emission scanning electron microscope (FE-SEM), Bruker three-dimensional (3D) profiler, and high-temperature ball on disc tribo-meter. The results showed that face-centered cubic (fcc) VCN, hexagonal close-packed (hcp) V2CN, fcc-Cu, amorphous graphite and CNx phases co-existed in VCN–Cu films. After doping with 0.6 at.% Cu, the hardness reached a maximum value of ~32 GPa. At room temperature (RT), the friction coefficient and wear rate increased with increasing Cu content. In the temperature range of 100–500 °C, the friction coefficient decreased, but the wear rate increased with the increase of Cu content.
Highlights
Transition metal nitride (TMN) nanocomposite films, exhibiting a good combination of mechanical, chemical, and wear resistance properties [1,2,3], have been widely used in many fields for surface strengthening [4,5]
To understand processes that are involved into friction and wear of VCN–Cu films, the effect of Cu on the microstructure, Micro-hardness and residual stress of the prepared VCN films was thoroughly studied
The phases of VCN–Cu films were explored by X-ray diffraction (XRD, Shimazu-6000, Shimadzu, Kyoto, Japan) with a Cu Kα source, operated at 40 kV and 35 mA with a scanning speed was 4◦ /min
Summary
Transition metal nitride (TMN) nanocomposite films, exhibiting a good combination of mechanical, chemical, and wear resistance properties [1,2,3], have been widely used in many fields (molds, cutting tools, engine parts, etc.) for surface strengthening [4,5]. Mo2 N–Cu nanocomposite films to study the effect of copper on the tribological properties in the range of 25–400 ◦ C They found that, after adding some Cu, the friction coefficient of Mo2 N film was reduced obviously in the temperature range of 200–400 ◦ C. Yu et al [17] prepared W2 N–Cu films and studied the effect of Cu content on the tribological properties in the temperature range of 25–600 ◦ C They found that the incorporation of Cu could improve the friction coefficient of W2 N film in this temperature range. The incorporation of soft phased Cu into VCN films is an effective method to improve the medium-temperature tribological properties. To understand processes that are involved into friction and wear of VCN–Cu films, the effect of Cu on the microstructure, Micro-hardness and residual stress of the prepared VCN films was thoroughly studied
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