Preparation and tribological properties of micro-textured diamond/WSx coatings

Zhao, Zhijun; Wei, Feng; Lu, Wei; Du, Xingzhu

doi:10.1016/j.surfcoat.2020.126369

Cited by 15 publications

(5 citation statements)

References 27 publications

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“…Figure shows the morphologies of the a-C/PAO/a-C friction systems before and after the sliding process under different contact pressures and oil contents. Taking the T60–5 system for example, upon completion of the sliding process, a portion of the lubricant molecules were trapped within the textured layer while the remainder were adsorbed onto the upper surface, which is attributed to the surface roughness-induced energy barriers. ,, However, when the contact pressure increased from 5 to 60 GPa (T60–60 system), strong mixing and interaction between a-C surfaces and the lubricant occurred after the sliding process compared with that before the sliding process and the textured structure was significantly broken, which was not observed for the T60–5 system. This indicated the dissociation of the lubricant and extensive reconstruction of the friction interface. , …”

Section: Results and Discussionmentioning

confidence: 99%

Atomistic Insights into Interfacial Optimization Mechanism for Achieving Ultralow-Friction Amorphous Carbon Films under Solid–Liquid Composite Conditions

Du,

Li,

Wei

et al. 2023

ACS Appl. Mater. Interfaces

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The combination of fluid lubricants and textured amorphous carbon (a-C) can provide an ultralow friction state, which can improve the reliability and service life of dynamic machinery. However, the coupling effects of the contact pressure and oil content on the friction-reducing efficiency is still lack of study, and the corresponding friction mechanism is also not fully understood, which cannot be achieved by experiment due to the limitation of in situ characterization. In this study, using the reactive molecular dynamics simulation, the insight into the evolution of interfacial structures induced by both contact pressures and oil contents on a-C surface was systematically investigated to explore the fundamental mechanism. In particular, the friction difference between textured and untextured a-C films was evaluated comparatively. Results indicate that the tribological performance strongly depends on the interfacial lubrication state, which is jointly determined by the oil content and contact pressure; the best operating condition to achieve ultralow friction coefficient (0.002) is obtained, and the evolution of friction coefficient with oil content and contact pressure is highly dominated by the lubricant mobility, cross-linking between mating a-C surfaces, or competition/synergy of the H stress state from the lubricant with interfacial passivation. Furthermore, the difference in friction reduction between textured and untextured systems is unveiled; with the increase of contact pressure, the role of texturing a-C surface in antifriction changes from positive to negative effect, which is related to the transformation of interfacial hybridized structure and anomalous flow of lubricant. These results can significantly enhance the understanding of composite lubrication systems through computation and also provide a roadmap for the R&D of the advanced lubrication system according to the working conditions.

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Section: Results and Discussionmentioning

confidence: 99%

Atomistic Insights into Interfacial Optimization Mechanism for Achieving Ultralow-Friction Amorphous Carbon Films under Solid–Liquid Composite Conditions

Du,

Li,

Wei

et al. 2023

ACS Appl. Mater. Interfaces

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“…In other words, it is reasonable to explore the tribology performances of the material surfaces with surface textures under different lubricant conditions while keeping the texture parameters such as texture width, depth and periodicity fairly constant. By reviewing the texture dimensions typically used in previous work [2,[35][36][37], it could be concluded that the well-designed textures with widths between 50-500 μm and depths between 0-120 μm can improve the tribology performances of the friction surfaces. Considering the complexity of the calculations, a groove-like surface texture with a width of 300 μm and a depth of 100 μm was chosen in this work.…”

Section: Cfd Simulationmentioning

confidence: 99%

Effect of lubricant infiltration into the groove-like surface texture on the friction response of the textured stainless-steel contact surface

Yang,

Cheng,

Zhao

et al. 2023

Surf. Topogr.: Metrol. Prop.

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Surface texturing is recognized as an effective solution for reducing friction on stainless-steel contact interfaces. Previous studies mainly focused on the influence of the texture parameters and lubricant-film depths on their tribology performances. Notably, whether the lubricant can penetrate texture and the lubricant infiltration capacity may significantly affect the tribology performances of the contact interfaces. They have been rarely considered, which may cause some well-designed textures to fail to perform their roles and be abandoned. Herein, a novel lubricant model is developed to explore the tribology performances of the contact interfaces with different lubricant infiltration capacities in textures and the influence factors of the lubricant infiltration capacities. Textured surfaces with different dimensions are fabricated by the femtosecond laser to explore the effects of the texture dimensions on the lubricant infiltration capacities. The results indicate that texture width, depth and lubricant viscosity could significantly affect the lubricant infiltration capacities. Moreover, the results indicate that the lubricant infiltration capacity would significantly affect the tribology performances of the contact interfaces. This work indicates that the impact of the lubricant infiltration should be considered in texture design. This work can be widely used to guide the texture design applied in plenty of fields.

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“…Besides DLC, graphite-like film [547] and mirror-like surface finish ultrananocrystalline diamond films on tungsten carbide [548] were reported respectively. In addition, micro-textured diamond/WS x coatings were prepared by inductively coupled plasma etching techniques (ICP) on the silicon substrate, and followed by hot filament chemical vapor deposition (HFCVD) [549].…”

Section: Carbon Filmsmentioning

confidence: 99%

A review of advances in tribology in 2020–2021

Meng

et al. 2022

Friction

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Around 1,000 peer-reviewed papers were selected from 3,450 articles published during 2020–2021, and reviewed as the representative advances in tribology research worldwide. The survey highlights the development in lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology, providing a show window of the achievements of recent fundamental and application researches in the field of tribology.

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Preparation and tribological properties of micro-textured diamond/WSx coatings

Cited by 15 publications

References 27 publications

Atomistic Insights into Interfacial Optimization Mechanism for Achieving Ultralow-Friction Amorphous Carbon Films under Solid–Liquid Composite Conditions

Atomistic Insights into Interfacial Optimization Mechanism for Achieving Ultralow-Friction Amorphous Carbon Films under Solid–Liquid Composite Conditions

Effect of lubricant infiltration into the groove-like surface texture on the friction response of the textured stainless-steel contact surface

A review of advances in tribology in 2020–2021

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