Abstract:

With lanthanum chloride,ammonium fluoride as raw material，silane coupling agent as the surface modification agent prepare colloid LaF3 By phase transfer method to transfer the prepared LaF3 colloid to methyl oleate，getting the diameter of 40 nm nano LaF3 addictives.．Centrifugal sedimentation method and speed temperature control was used to study the additive of nano LaF3 dispersion stability and high-temperature stability. Tribological properties of nano LaF3 liquid additives were studied with a four-ball wear test machine, and steel ball surface were investigated by scanning electron microscopy (SEM) and (EDS). The results show that nano LaF3 liquid additives in the 100N base oil has good dispersion stability, with excellent extreme pressure, anti-wear and friction-reducing properties. Surface wear of steel balls significantly reduce and wear surface protecting film containing elements such as La,F.

Key words: nano LaF3, lubricant, lubricating additive, tribological properties