Nanostructured WS2–Ni composite films for improved oxidation, resistance and tribological performance

Fabrication and dry cutting performance of Si3N4/TiC ceramic tools reinforced with the PVD WS2/Zr soft-coatings

“…It revealed that no WS 2 /Zr diffraction peak was observed for the coated sample, which indicated that the structures of the WS 2 /Zr soft-coatings were amorphous, and the alloying of the WS 2 with Zr restricted the growth of crystalline WS 2 crystalline phase. The similar results were found that the addition of metal (Zr, Cr and Ni) to MoS 2 or WS 2 film resulted in distortion of the MoS 2 or WS 2 lattice parameters and amorphous structures [31,41,42]. Fig.…”

“…The low friction characteristics of these coatings are attributed to their anisotropic hexagonal layered structures resulting in very low shear strength [28,29]. In order to achieve low friction and wear, the additions of metals to the dichalcogenide matrix are found to modify the microstructures and improve the mechanical and tribological properties, such as MoS 2 -Ti [30], MoS 2 -Zr [31], WS 2 -Cr [32], WS 2 -Ni [33], WS 2 -Ag [34], etc. In fact, WS 2 exhibits higher thermally stability withstanding temperature of about 100 1C higher compared with MoS 2 [35], which may provide a wider range of application as lubricants in films and it still needs to be further studied.…”

Fabrication of novel heterostructured few layered WS2-Bi2WO6/Bi3.84W0.16O6.24 composites with enhanced photocatalytic performance

“…The S 2p binding energies 161.8 eV (S 2p 3/2 ) and 164.1 eV (S 2p 1/2 ) in WS 2 , and the O 1s binding energy 530.1 eV (crystal lattice oxygen) are also identified in the spectra ( Fig. 4c and d) [48,49]. These results show evidence for the presence of WS 2 in the ternary heterostructured WS 2 -BWO composite.…”

“…As shown in Fig. 4b, the binding energies of 32.4 and 34.9 eV for W 4 f7/2 and W 4f 5/2 peaks are attributed to W 4+ in WS 2 , while the peak of 37.5 eV is due to W 6+ in Bi 2 WO 6 and Bi 3.84 W 0.16 O 6.24 [47,48]. The S 2p binding energies 161.8 eV (S 2p 3/2 ) and 164.1 eV (S 2p 1/2 ) in WS 2 , and the O 1s binding energy 530.1 eV (crystal lattice oxygen) are also identified in the spectra ( Fig.…”

Untitled

“…XRD and EDS analyses suggested that the compacted films are WS 2 -rich films at temperatures below 400 °C, while the wear debris oxide particles strongly consist of WO 3 at temperatures above 600 °C. This denotes that WS 2 partially oxidizes into WO 3 on the worn surface of MW at temperatures above 400 °C, leading to decline of its lubricating characteristics as mentioned by [25]. Furthermore, at 600 °C and 800 °C, WS 2 is damaged by oxidization.…”