Friction between a Steel Ball and a Steel Flat Lubricated by MoS₂Particles Suspended in Hexadecane at 150 °C

Abstract

A steel ball was slid on a steel flat lubricated by molybdenum disulfide (MoS 2 ) particles suspended in hexadecane oil at 150 °C. The friction data is compared with that obtained when the ball was slid on the flat sprayed apriori with nominally dry MoS 2 particles. The friction in the dry experiment was found to increase with temperature while the friction in wet condition was found to decrease with increasing temperature. Micro-Raman and Fourier transform IR spectroscopy are used to explore the roles of environmental moisture and chemical degradation of oil on the formation of antifriction film on the steel substrate.

Lubrication performance of MoS2 and SiO2 nanoparticles as lubricant additives in magnesium alloy-steel contacts

“…Furthermore, it is well known that MoS 2 nanoparticles are among the most common lubricant additive due to a layered and two-dimensional structure with weak van der Waals forces between its molecular layers and strong interlayer covalent bonds. Its efficacy for tribological applications was demonstrated in many reports [12][13][14]. Previous studies revealed that the lubrication performance of MoS 2 nanoparticles was not only dependent on quantity, the morphology, size and crystal structure but also the contact surfaces [15,16].…”

Optical, Vibrational, and Structural Properties of MoS2 Nanoparticles Obtained by Exfoliation and Fragmentation via Ultrasound Cavitation in Isopropyl Alcohol

“…In the past few years, the interest in exploration of layered materials has paved the way to the synthesis and characterization of graphene, graphene-like materials, and their composites. , Among all transition metal dichalcogenide semiconductors, MoS 2 has attracted huge interest because of its electronic, optical, and catalytic properties, − as well as for its possible applications in many fields (dry lubrification, nanoelectronics, electrode materials for Li-ion batteries, photovoltaic cells, membranes, photocatalysts, catalysts for hydrodesulfurization, hydrogen evolution, and oxygen reduction). − Depending on the application fields, two main structures can be considered: regular and large-area MoS 2 monolayers, with unique electronic and optical properties, − and small clusters, quantum dots, or “patches” (often defective) made by few-layer MoS 2 of reduced size, which can have enhanced photoluminescence, catalytic, photocatalytic, and electrochemical efficiencies. ,,− It is known that, moving from bulk to large area monolayers to nanoparticles, strong quantum size effects are occurring, which alter the optical properties. In more detail, a three-dimensional confinement of the carriers produces larger energy shifts of the exciton peaks than those due to the one-dimensional (perpendicular to the layer planes) confinement.…”

Synthesis and Characterization of Molybdenum Disulfide Nanoflowers and Nanosheets: Nanotribology

“…MX 2 (M = Mo, W and X = S, Se) are well known for their solid-lubrication properties. Molybdenum disulfide (MoS 2 ) has a layered hexagonal crystal structure, which is mostly important for solid lubrication or as an additive for lubricating oils [12][13][14]. These materials offer low shear resistance to any applied shear stress due to their layered structure with strong intralayer covalent bonds and weak interlayer van der Waals bonds, which decreases friction between interfaces [15].…”