System-Structural Analysis of Tribological Behavior of Antifriction Material in Friction Pairs Operating in Surfactants

The results of testing a pair of reversible sliding friction “bronze BrA5 — steel 45” in dispersion-lubricating media characterized by varying degrees of surface activity with respect to bronze are presented. Changes in microstructural characteristics during tribo-deformation of metal were analyzed from the standpoint of the Rebinder effect, which determines the possibility of implementing the phenomenon of selective transfer (wear-free mode) during tribopair operation. It is shown that when bronze is rubbed in lubricant-dispersion media characterized by relatively low surface activity, the influence of the medium on the surface structure of the tribo-material is based on the realization of a surface-strengthening effect — the total density of dislocations in the deformed near-surface layer increases. The wear intensity in this case is I_h ≈ 1.5ꞏ10^–7—4.0ꞏ10^–8. When bronze is rubbed in moderately surfactants, both surface-plasticizing and surface-hardening effects are realized with the predominance of the latter. At the same time, the wear intensity decreases slightly, taking values in the range of I_h ≈ 1,2∙0^–7—1,5∙10^–8. During tribo-tests of bronze in environments with increased surface activity, the bronze wear intensity remains at a fairly low level: I_h ≈ 2.2ꞏ10^–8—3.0ꞏ10^–8. However, in this case, two crystallographically isostructured solid solutions are formed in the near-surface layer of the tribomaterial, one of which is enriched with copper. Based on the concepts of the physical-chemical mechanics of contact interaction, the system-structural foundations of the material science approach, underlying the analysis of the tribological efficiency of liquids used as dispersion media for plastic lubricants are described.

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