Tribological Properties of Laser Gridding Quenched Sulfuration/Nanoparticles Compound Layer

Tribological behaviors under various loads of laser gridding quenched Sulfuration layer (SLD layer) and laser gridding quenched Sulfuration/ Nanoparticles compound Layer (NLD layer) were investigated by using a MFT-R4000 machine. The worn surface morphology, elements and chemical valence states were analyzed by scanning electron microscopy and X-ray photoelectron spectrometer. The results show that the NLD layer, which had friction coefficient of 0.075 under dry friction condition, showed better friction-reduction property than SLD layer under heavy load, and longer service lifetime under light load. A tribo-chemical reaction film was composed of sulfide, sulfate and oxide was observed. The n-SiO₂ particles may served as micro/nano rolling-ball on friction surface.