Microstructure and tribological characterization of magnetron sputtered MoS2 film deposited using nested structure material

Xia, Zhenbo; Tu, Jiangping; Lai, D.M.; Zhang, L.L.; Wang, Qian; Chen, L.M.; Chen, W.X.

doi:10.1016/j.surfcoat.2006.01.025

Cited by 17 publications

(4 citation statements)

References 14 publications

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“…The prominence of the (002) peak in the XRD pattern of the thermally annealed MoS 2 thin films indicates the presence of a well-stacked layered structure. The (002) lattice planes of the samples are characterized by a shift to a lower 2θ as compared with the standard in the 2H-MoS 2 crystal, which indicates lattice expansion and results from the introduction of strain owing to the curvature of the layered MoS 2 [35]. This result may be primarily attributed to straining of the basal plane spacing due to the defects [34].…”

Section: Resultsmentioning

confidence: 96%

Thermal annealing effects on the electrophysical characteristics of sputtered MoS₂ thin films by Hall effect measurements

Xiao

Gong

2019

Semicond. Sci. Technol.

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Transition-metal dichalcogenide (MoS 2 ) is gaining increasing attention as a promising highperformance material in practical applications because of its wide-range electrical properties. However, the effect of thermal annealing on the electrophysical characteristics of MoS 2 remains unclear. In this study, the physical and electrophysical properties of MoS 2 thin films were characterized by Hall effect measurements. Large-area and high-quality MoS 2 thin films were obtained by RF sputtering and then subjected to ex situ thermal annealing. As the thermal annealing temperature was increased, the crystallinity of the MoS 2 thin films improved and the corresponding Fermi level shifted toward the valence band. At thermal annealing temperatures above 900 °C, the conductivity type of the MoS 2 thin films changed from the intrinsic n-type to p-type due to the emergence of MoO 3 . In addition, the orientation of the Hall coefficient was indefinite under thermal annealing, implying the electrical transport anisotropy of the MoS 2 thin films, which can be attributed to the spin-orbit coupling of the exposed Mo atoms in the films with sulfur vacancies. Furthermore, the Hall mobility and carrier concentration of the annealed MoS 2 thin films were up to 4.40 cm 2 V −1 s −1 and 12.5×10 16 cm −3 , respectively, at a Hall testing temperature of 305 K and an external magnetic field of 0.5 T.

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Section: Resultsmentioning

confidence: 96%

Thermal annealing effects on the electrophysical characteristics of sputtered MoS₂ thin films by Hall effect measurements

Xiao

Gong

2019

Semicond. Sci. Technol.

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“…Xia et al. 21 also found that pure MoS 2 coating can easily fail in high humid environment. To sum up, it is of significance to expand the application of Si 3 N 4 -based materials to further define the role of humidity on the wear mechanism of the Si 3 N 4 –hBN ceramic composites.…”

Section: Introductionmentioning

confidence: 97%

Effect of the humidity on the friction and wear characteristics of Si₃N₄–hBN composite ceramics

Chen

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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The tribological behaviors of Si3N4–hBN composites sliding against austenitic stainless steel at different relative humidities (RH25∼35%, RH55∼65%, and RH90% or higher) were investigated by using an MMW-1 type vertical universal tribometer. The morphological and chemical characterizations of the worn surfaces of the specimens were conducted by using scanning electron microscopy, energy-dispersive X-ray spectroscopy, laser scanning microscope, and X-ray photoelectron spectroscopy. The results showed that the friction coefficients of Si3N4–10%hBN/ASS sliding pairs were lowered to about 0.03 under the relative humidity of RH55∼65%. This was mainly attributed to the formation of a surface film (consisting of B2O3, SiO2, and Fe2O3) on the wear surface of the SN10/ASS pairs. The surface film lubricated and protected the wear surfaces of pin and disc. Under the relative humidity of RH25∼35%, the formation of the surface film was limited because of less water molecules. Under the relative humidity of RH90% or higher, a part of the water molecules in the air can easily deposit on the wear surfaces, so that the microcracks on the wear surfaces would be promoted to expand, resulting in the inability to form a continuous and stable surface film. Besides, for Si3N4/austenitic stainless steel pair, no tribofilm was formed on the surfaces, and higher friction coefficient and wear rate were obtained. When hBN content increased to 20% or higher, rough wear surface was covered by the wear debris layer mainly due to their poor physical and mechanical properties.

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“…However, MoS 2 is prone to water adsorption from air because of its hygroscopic property. Hence, it is very sensitive to humid environment (Hilton et al, 1998;Lince et al, 1995;Wang et al, 1999;Xia et al, 2006), resulting in poor tribological properties, including increased friction coefficient, degraded wear resistance, low hardness and reduced lifetime. Meanwhile, MoS 2 coatings can easily fail in high humid environment because of its loose structure, low hardness, poor adhesion strength and high chemical activity of oxygen.…”

Section: Introductionmentioning

confidence: 99%

Preparation and tribological properties of MoS₂/graphite composite coatings modified by La₂O₃

Qiu

Zhang

et al. 2018

ILT

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Purpose The MoS2/graphite composite coatings modified by La2O3 through spraying technique were successfully prepared on the inner rings of spherical plain bearings. As a comparison, unmodified coatings were also prepared. This paper aims to study the La-modified MoS2/graphite composite coating experimentally and improve the tribological performance of self-lubricating spherical plain bearings. Design/methodology/approach The performance of La2O3 toward the friction coefficient, temperature rise and wear rate of the coatings was studied by a self-made tribo-tester under different swing cycles. And the texture, surface morphology and element composition of the coatings were characterized by scanning electron microscope, energy dispersive spectroscopy and X-ray diffractometry. Findings The additives La2O3 refined the coatings’ microstructure and improved the tribological properties of the coatings. The oxidation of Mo + 4 to Mo + 6 was effectively inhibited. And the amount of abrasive grains, peeling pits and local cracks on the coatings surface decreased and homogeneous lubricating films formed, which were attributed to the existence of La2O3. The wear mechanisms of unmodified coatings were severe abrasive wear, adhesive wear and delamination wear. However, it exhibited superior wear resistance of the La-modified coatings to unmodified coatings, presenting slight abrasive wear and adhesive wear. The service life of bearings was prolonged under the protection of the modified coatings. Originality/value The paper proposed a new modified MoS2/Graphite composite coating for the self-lubricating spherical plain bearings. The investigation on the friction, wear and temperature increase behaviors and the wear mechanisms of the coatings are beneficial to prolonging the service life of the self-lubricating spherical plain bearings.

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Microstructure and tribological characterization of magnetron sputtered MoS2 film deposited using nested structure material

Cited by 17 publications

References 14 publications

Thermal annealing effects on the electrophysical characteristics of sputtered MoS₂ thin films by Hall effect measurements

Thermal annealing effects on the electrophysical characteristics of sputtered MoS₂ thin films by Hall effect measurements

Effect of the humidity on the friction and wear characteristics of Si₃N₄–hBN composite ceramics

Preparation and tribological properties of MoS₂/graphite composite coatings modified by La₂O₃

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Microstructure and tribological characterization of magnetron sputtered MoS2 film deposited using nested structure material

Cited by 17 publications

References 14 publications

Thermal annealing effects on the electrophysical characteristics of sputtered MoS2 thin films by Hall effect measurements

Thermal annealing effects on the electrophysical characteristics of sputtered MoS2 thin films by Hall effect measurements

Effect of the humidity on the friction and wear characteristics of Si3N4–hBN composite ceramics

Preparation and tribological properties of MoS2/graphite composite coatings modified by La2O3

Contact Info

Product

Resources

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Thermal annealing effects on the electrophysical characteristics of sputtered MoS₂ thin films by Hall effect measurements

Thermal annealing effects on the electrophysical characteristics of sputtered MoS₂ thin films by Hall effect measurements

Effect of the humidity on the friction and wear characteristics of Si₃N₄–hBN composite ceramics

Preparation and tribological properties of MoS₂/graphite composite coatings modified by La₂O₃