VTMOEO-Intercalated Magnesium Silicate Hydroxide: Enhanced Tribological Properties via Adsorption Film Formation

Abstract Magnesium silicate hydroxide (MSH) is valued for its excellent antiwear and self-repairing properties. In this study, vinyl-tri-(2-methoxyethoxy)-silane (VTMOEO) was used to modify MSH via a hydrothermal method, synthesizing VTMOEO-intercalated MSH (VTMOEO@MSH). Characterization confirmed the successful intercalation of VTMOEO into the layers of MSH. Tribological tests showed that VTMOEO@MSH exhibited outstanding antiwear and friction-reducing properties in PAO. The optimal formulation reduced the friction coefficient and wear volume by 41.2% and 32.5%, respectively, compared to the PAO. Scanning electron microscopy (SEM), molecular dynamics simulation, and optical interference experiments demonstrated that VTMOEO modification enhanced the adhesion of MSH on the worn surface and prevented its reaction with the worn surface, forming a removable adsorption film. This suggests that the antiwear and antifriction mechanism of VTMOEO@MSH operates by forming an adsorption film on the friction surface.