Research on the mechanism and activity of antimony thioantimonate in tribological systems

摘要

This paper presents the tribological wear results of antimony thioantimonate with molybdenum sulphide and/or graphite composite bonded solid films. The bonded solid film containing only antimony thioantimonate does not form an antiwear film. It was concluded that the antimony thioantimonate in the presence of MoS{sub}2 had a graphite effect on the antiwear properties of composite solid film. During electrochemical research it was observed that particles of antimony thioantimonate in organic solvents, unlike other composite components, had a bipolar character. The electrochemical behaviour of this additive in rubbing contact influenced the tribological properties of composites suspended in liquid organic compound. On the basis of the surface topography and the SEM/EDS analysis of surface layers it was found that antiwear layers were formed by tribological conversion of antimony thioantimonate. The effect of applied load on the antiwear properties of antimony thioantimonate was observed. At the lower loads tested this additive decomposes by tribofragmentation, and reproducible triboreaction layers consisting mainly of metal sulphides were formed. At higher loads sulphide reaction layers are formed and removed from the friction zone and antiwear diffusion-alloy layers were formed.