Compaction of Hydrophobic Molybdenum Disulfide Coatings for Promoting Tribological Behaviors on Engineering Steel

Abstract

Ambient environment has a crucial effect on the lubrication performance of molybdenum disulfide (MoS 2 ) coatings. In this work, we fabricated porous MoS 2 coatings via a facile optimized aerosol-assisted chemical vapor deposition (AACVD) method. It is found that the obtained MoS 2 coating demonstrates outstanding antifriction and antiwear lubrication performance with the coefficient of friction (COF) and wear rate as low as 0.035 and 3.4 × 10 −7 mm 3 /Nm in lower humidity (15 ± 5)%, respectively, which is comparable to the lubrication ability of pure MoS 2 in vacuum. In addition, the hydrophobic property of porous MoS 2 coatings is suitable for infusing lubrication oil to achieve stable solid−liquid lubrication in higher humidity (85 ± 2)%. The composite lubrication system shows excellent tribological behavior in both dry and wet environments, which will alleviate the sensitivity of the MoS 2 coating to the environment and ensure the service life of the engineering steel in complex industrial backgrounds.

Alkylamine-Grafted Molybdenum Disulfide Nanosheets for Enhanced Dispersion Stability and Lubricity Properties

“…With the development of industrial globalization, the phenomenon of friction is widespread in transportation, biomedicine, aerospace, energy exploration, ocean engineering, major equipment, and other industry fields. − According to estimates, about one-third of the world’s energy is consumed in various forms of friction and wear, which brings about serious material losses, thereby resulting in a loss of nearly 2% to 7% of the Gross National Product (GNP) and a huge negative impact on the ecological environment. − As machinery and equipment also develop in the direction of high accuracy, high efficiency, high speed, heavy load, and energy saving, − the blood in modern mechanical systemsthe lubricantis also facing a serious test. − At the same time, friction-induced wear directly limits the stability, security, and dependability of mechanical moving parts, which inevitably increases production costs and the occurrences of mechanical accidents. , Currently self-lubrication, coating, oil-based lubrication, and water-based lubrication can effectively reduce the negative effects of friction, where the use of oil-based lubrication is a potential direction for future technological development and one of the most effective ways to reduce energy dissipation and failure of mechanical moving parts. ,, This stems from the fact that the friction pairs formed by mechanical components are usually lubricated and isolated by a film of fluid lubricant, thereby avoiding direct contact between the friction pairs . Yet, the development of a new high-performance lubricant that is economical, efficient, and green remains a central goal of both academia and industry. − …”

Fabrication of Zwitterionic Polymer-Functionalized Onion-like Carbon Nanoparticles as Aqueous Lubricant Additives

“…According to statistics in the world, about one-third of the energy is consumed in various forms of friction, and about 80% of machine parts fail because of wear. − The utilization of lubricants is an effective measure that can effectively reduce friction and wear as well as the consumption of energy resources. At present, the most simple and effective lubricants used in industry are mainly liquid lubricants. , Compared to oil-based lubricants, water-based lubricants have been widely researched and applied in bearing, hydraulic transmission, biomedical, and other areas due to their advantages of being nontoxic, environmental friendliness, low cost, wide range of sources, being noncombustible, and good cooling properties. − However, the shortcomings of low viscosity, poor load-bearing capacity, and strong corrosiveness of water largely limit the development of aqueous lubrication .…”