Dispersion-tribological property relationship in mineral oils containing 2D layered α-zirconium phosphate nanoplatelets

Abstract

Inorganic nanomaterials exhibit superior friction-reduction and anti-wear properties in oils. In this study, 2D layered -zirconium phosphate (-ZrP) nanosheets intercalated with different amines have been synthesized to study their dispersion stabilities in lubricating oil and tribological applications. The intercalated amines should be sufficiently long and lipophilic to provide stabilization to -ZrP nanosheets in mineral oil. The results of tribological tests illustrate that with the addition of well-dispersed nanosheets, the coefficient of friction (COF) and pin volume loss reduce by ~47% and 75%, respectively. The excellent dispersion stability enables the nanosheets to flow into the contact area at the beginning, and thereby protect the rubbing surface. A reduction in the van der Waals forces between the adjacent layers induced by the intercalated amines transforms the friction between adjacent layers from pin disk to sliding, leading to a decrease in the COF under hydrodynamic lubrication. The study provides a new method to enhance the tribological properties via tuning the dispersion stabilities of nanomaterials in oils.

In Situ Study of Structure–Activity Relationship between Structure and Tribological Properties of Bulk Layered Materials by Four-Ball Friction Tester

“…Similarly, the Raman signals of the exfoliated h-BN and WS 2 are found on the worn surfaces. These results demonstrate that the exfoliated nanosheets can be filled into the groove of the worn surface in ball-milling. − Therefore, it can be concluded that ball-milling plays a key role in the structural evolution of bulk layered materials, and the coefficient could reflect the structural change in bulk layered materials at the friction interface to some extent. That is to say, the originally integrated structure makes a great contribution to the better lubrication properties.…”

Polymer functional coatings modified by ZrP‐based composites: Preparation and applications on marine concrete

“…α‐ZrP has a good anti‐wear performance, friction reduction, and load‐carrying capacity as a solid lubricating additive 55,56 . Figure 12 shows the typical frictional curves of the four coatings versus time.…”

“…α-ZrP has a good anti-wear performance, friction reduction, and load-carrying capacity as a solid lubricating additive. 55,56 Figure 12 shows the typical frictional curves of the four coatings versus time. The COF of composites with no coating treatment was high and exhibited large fluctuation.…”

Investigation of the Drag-Reduction Phenomenon on Plasma-Modified Surface

“…The interaction between a fluid in movement and a solid generates considerable energy losses due to resistance to flow, also called drag. Minimizing drag losses is beneficial for a multitude of industries, such as the naval and aeronautics industries [1][2][3][4][5][6]. Still, in the 1940s, it was discovered that the addition of small amounts of soluble polymers with a high molecular weight was affected by flow resistance without affecting the viscosity or density of the fluid in turbulence [7].…”