Induced Decomposition and Slip Interface Transformation of Oleic Acid Enables Ultralow Wear in Boundary Lubrication.

The tribological behavior of carboxylic acids, especially oleic acid, in boundary lubrication conditions is a subject of interest. This study presents the results of four-ball tribological tests conducted under varying contact pressures and sliding speeds. The findings reveal a critical turning speed within a confined zone, which causes a significant change in the frictional performances of oleic acid, leading to the formation of an ultralow wear tribofilm.

Macroscale Superlubricity Accomplished by SbO-MSH/C Under High Temperature.

Here, we report the high-temperature superlubricity phenomenon accomplished in coatings produced by burnishing powders of antimony trioxide (SbO) and magnesium silicate hydroxide coated with carbon (MSH/C) onto the nickel superalloy substrate. The tribological analysis performed in an open-air experimental setup revealed that with the increase of testing temperature, the coefficient of friction (COF) of the coating gradually decreases, finally reaching the superlubricity regime (the COF of 0.008) at 300°C.

Superlow Wear Realizable Tribofilms from Lubricant Oil Containing Hydrothermally Synthesized Magnesium Silicate Hydroxide/Carbon Core-Shell Nanoplates.

This paper reports on the hydrothermal synthesis of a novel 2D material, magnesium silicate hydroxide/carbon (MSH/C) core-shell nanoplate, in a graphite-MgO-SiO-NaOH system at 300 °C and 12 MPa for 48 h. Its significant potentials as an antiwear additive in lubricant oil were subsequently demonstrated. The 2D nanoplates consist of an MSH core and a 1-6 nm thick sp-hybridized carbon shell with a layer spacing of 0.