Abstract

The paper aims to present lubricants and materials that allow and can be used under selective transfer conditions as an application with a useful effect on the friction and wear process. In order to achieve selective transfer, it is necessary to have appropriate lubricants and materials. The molecular phenomena at the separation interface of two adequately lubricated solid materials are complex. Experimental studies proved that physicochemical processes take place as long as there is relative movement on the real contact area, but also afterwards. Under optimal operating conditions in the friction process, a thin, superficial protective layer (usually based on copper) is formed in the contact areas by the selective transfer, with the possibility of self-regulation. The self-regulation process of the protective layer owes its special properties to one or more of the chemical elements of the lubricants and materials, and in the presence of a local energy that favors the process. These properties take into account, in particular, the reduced sliding resistance after a certain direction and the possibility of transfer in a very short time, specific to contact on roughness, with a positive effect on friction and wear.

Keywords

selective transfer; lubricants and specific materials; friction and wear, applications