Abstract
A LaF 3 nanoparticle surface coated by organic compounds containing S and P was synthesized by the chemical surface modification method. The particle size and structure were characterized using a transmission electron microscope (TEM) and electron diffraction (ED), their tribological behaviors were evaluated on a four-ball machine. The results showed that LaF 3 nanoparticles as an oil additive can strikingly improve the load-carrying capacity and antiwear property of the base oil and had better friction-reduction when compared to that of ZDDP. The rubbed surfaces were investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscope (XPS). It can be found that the boundary film on the worn surface was composed of LaF 3 nanoparticles depositing film and tribochemical reaction film of the elements of S and P, which contributed to excellent tribological properties of LaF 3 nanoparticle modified by compound containing S and P as an additive in liquid paraffin.
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