Dang Hongxin

Study of the friction and wear properties of MoS2-filled Nylon 6

Abstract The friction and wear properties of MoS 2 -filled Nylon 6 were evaluated with a Timken tester. Scanning electron microscopy (SEM), electron probe microanalysis (EPMA) and X-ray photoelectron spectroscopy (XPS) were used to study the rubbed surfaces. It was found that MoS 2 is not very effective for reducing friction but causes an increase in wear. EPMA and SEM analysis revealed that the transfer film is not continuous. XPS analysis indicated that MoS 2 is oxided into MoO 3 and does not become enriched in the transfer film.

The pore-enlargement and self-lubrication treatment of anodic oxide film of aluminum

Abstract The anodic oxide film of aluminum formed in oxalic acid solution has a porous structure. The influence of pore-enlargement treatment on the porous structure and tribological properties of the film was investigated. After the pore-enlargement treatment, a method of synthesizing MoS2 in the pores was used to improve the tribological properties of the film. The mechanism of friction reduction of MoS2 synthesized in the pores of the film is also discussed. The results show that with the duration of pore-enlargement treatment, the diameter of the pores and the surface porosity of the film increase, and the hardness and wear resistance of the film decrease. The diameter of the pores and the surface porosity of the film increase to about 70 nm and 30%, respectively, the optimum values being obtained at 2 h, while the film still maintains its high hardness and good wear resistance. After self-lubricating treatment, the friction coefficient decreases from 0.87 to 0.65, and the wear rate of the steel ball decreases obviously. Since no MoS2 transfer film is formed between the tribocouple faces, the lubricating effect of MoS2 synthesized in pores of the film is limited.