Elevated-temperature super-lubrication performance analysis of dispersion-strengthened WSN coatings: Experimental research and first-principles calculation

Zhu, Jianing; Zeng, Qunfeng; Zhang, Bin; Chen, Yan; He, Wanjun

doi:10.1016/j.surfcoat.2020.126651

Cited by 18 publications

(14 citation statements)

References 38 publications

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“…From these studies, we can infer that the frictional performance of the coatings improves with an increase in temperature, i.e., the COF at room temperature is higher than the one at elevated temperatures (obviously up to a certain limit in which the coating does not degrade). Similar results in room-and high-temperature sliding have also been reported by other research groups [29,35,36].…”

Section: Introductionsupporting

confidence: 91%

Effect of Annealing Heat Treatment on the Composition, Morphology, Structure and Mechanical Properties of the W-S-N Coatings

et al. 2022

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Alloyed-transition metal dichalcogenide (TMD) coatings have been under investigation as multi-environment lubricants for the past few decades. These coatings display very low coefficient of friction properties at elevated temperatures. Studies on the annealing of these low-friction coatings are missing in the literature. For the first time, in this study, the annealing of the W-S-N dry lubricant coatings was carried out to study its effects on the composition, morphology, crystal structure and hardness of the coatings. The W-S-N coatings were deposited by direct current (DC) reactive magnetron sputtering. The analysis was carried out for as-deposited, 200 °C and 400 °C annealed coatings. The as-deposited coatings have N content in the range of 0–25.5 at. %. The coatings are compact and the densification increased with the increase in N-alloying. All the coatings are crystalline except the highest N-alloyed coating which is X-ray amorphous. A maximum hardness of 8.0 GPa was measured for the coating alloyed with 23 at. % N. Annealing did not affect the composition and morphology of the coatings, while some variations were observed in their crystal structure and hardness. The maximum hardness increased from 8 GPa to 9.2 GPa after 400 °C annealing of the 23 at. % N-alloyed coating.

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Section: Introductionsupporting

confidence: 91%

Effect of Annealing Heat Treatment on the Composition, Morphology, Structure and Mechanical Properties of the W-S-N Coatings

et al. 2022

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“…The friction pair was a Si 3 N 4 ball, the load was 3 N, and the relative sliding speed was 0.05 m/s. Compared to previous works on the elevated temperature tribology of pure WS 2 and WSN coatings, 27,28 the CoF and wear resistance of the WSNb coating #2 at 400 °C were significantly improved, and due to the incorporation of Nb, the coatings exhibited better elevated-temperature tribological properties. The above analysis indicates that a small amount of Nb doping can enhance the tribological properties of WS 2 -based coatings at elevated temperature, while a large amount can increase the CoF of the coatings at elevated temperatures.…”

Section: Resultscontrasting

confidence: 68%

“…26,27 Furthermore, it has been reported that the WSN coating can even achieve an ultra-low friction behavior with a CoF of less than 0.01 at an elevated temperature of 400 °C. 28 Nevertheless, at 400 °C, which is close to the oxidation temperature of WS 2 (425 °C), 29 the lubricating film between friction pairs is oxidized and worn out under the action of frictional heat. Consequently, both the wear resistance and lubrication life are poor.…”

Section: Introductionmentioning

confidence: 95%

Improving the lubrication of WSNb nanocomposite coatings by the in-situ oxygen shielding effect at elevated temperatures: A combined study with density functional theory simulations

Zhu

Zeng

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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In order to improve the lubrication performance of the WS2-based coatings at elevated temperature, the mechanisms of enhancing the tribological performance of WSNb coatings at elevated temperatures are investigated. The WSNb coating doped with 11.9 at.% Nb exhibited excellent anti-friction and wear resistance, achieved a low coefficient of friction of 0.02 at 400 °C, and its wear resistance was much better than that of WS2-based coatings. The Nb metal and its sulfide in the coating are more sensitive to oxygen than WS2 at 400 °C, which reduces the oxygen concentration between the friction pairs and protects the WS2 lubricating phase from being oxided. In addition, Nb enhances the hardness and Young's modulus of the coatings through the solid solution strengthening effect, generating a more continuous and stable lubricating film during the silding process. First-principles calculation results demonstrated that the Nb spontaneously forms Nb-S bonds with S atoms in the coating. The molecular details of the Nb-S formation have been investigated in depth.

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“…The diffusion involves a network formed by adhesion at the interface, which leads to the disappearance of the interface and the generation of a transition zone, and the two phases are connected through the winding of the diffused molecules or chain segments and their cohesion to form a strong adhesive joint. Macroscopic physical quantities are predicted and calculated by the molecular dynamics method through simulating the microstructure and motion of the system’s molecules [ 21 , 22 , 23 ]. An image of the microstructure, particle motion and the relationship with the macroscopic properties of material can be provided, and it can reveal the macroscopic properties and processes of many substances.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Adhesion at the Interface of Steamed Bread and Eggshell

Zeng

Zhu

2022

Molecules

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The adhesion phenomenon of polymers occurs in nature and in human activity. In the present paper, an adhesion system of steamed bread and eggshell was observed in formation when steamed bread and eggshells were placed in close contact and cooled slightly in the ambient air. The adhesion phenomena and mechanism of the adhesion interface between the steamed bread and eggshell were investigated and systematically discussed. Strong-bond interfaces were observed by scanning electron microscope (SEM). The formation process and mechanism of the strong-bond adhesion were also analyzed molecular dynamics simulation technology, and the results are discussed. The simulation analyses showed that the starch molecules at the calcite (104) crystal face were diffused in a water vapor environment, and the formation and solidification of multiple hydrogen bonds in the starch chain and oxygen atoms in the calcium carbonate were observed in detail during cooling. The diffusion rate of hydrogen atoms in hydroxyl groups on the calcite surface decreased gradually with the decrease of the cooling temperature of the steamed bread’s upper surface. The strong adhesion of the steamed bread and eggshell is attributed to the synthetic effect of the absorption, diffusion, surface chemistry, and the formation of multiple hydrogen bonds between the starch from the steamed bread and the calcium carbonate crystals in eggshell. The interesting findings are helpful for the design of strong bonds, and provide an idea for new environmentally friendly adhesive materials.

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Elevated-temperature super-lubrication performance analysis of dispersion-strengthened WSN coatings: Experimental research and first-principles calculation

Cited by 18 publications

References 38 publications

Effect of Annealing Heat Treatment on the Composition, Morphology, Structure and Mechanical Properties of the W-S-N Coatings

Effect of Annealing Heat Treatment on the Composition, Morphology, Structure and Mechanical Properties of the W-S-N Coatings

Improving the lubrication of WSNb nanocomposite coatings by the in-situ oxygen shielding effect at elevated temperatures: A combined study with density functional theory simulations

Analysis of Adhesion at the Interface of Steamed Bread and Eggshell

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