The synergistic effect of copper powder with PTFE in a grease lubricant under mixed friction conditions

Tribological Investigations of Nano and Micro-sized Graphite Particles as an Additive in Lithium-Based Grease

“…Some solid lubricants (SLs) such as PTFE [8][9][10], MoS 2 [11], graphite [12,13], etc., have previously been shown as effective additives in grease formulations. Other lesser known SLs such as Talc [14], CaF 2 crystals [15], CaCO 3 [16], copper powder [17] and copper oxide [18] have shown some potential as anti-wear (AW), anti-friction (AF) and enhanced load-carrying capacity either alone or in combination. Carbon in various forms viz.…”

Tribological properties and tribochemical analysis of nano-cerium oxide and sulfurized isobutene in titanium complex grease

“…Above the value of P B , the boundary film (mainly formed by physical or chemical adsorption) rupture with sharply increasing wear. Therefore, the value of P B displays the load-carrying ability of boundary film [22]. Then, the only boundary lubrication occurs in the test when the load is between the value of P B and weld load (P D ), in which the weld load is the maximum value of load-carrying ability of chemical reaction film (mainly formed by chemical reaction) [22].…”

“…Therefore, the value of P B displays the load-carrying ability of boundary film [22]. Then, the only boundary lubrication occurs in the test when the load is between the value of P B and weld load (P D ), in which the weld load is the maximum value of load-carrying ability of chemical reaction film (mainly formed by chemical reaction) [22]. Therefore, the region before the P B is the anti-wear region, whereas the region beyond P B is known as extreme pressure region [27].…”

“…It was also revealed that the active sulfur atom is capable of forming a bond with iron, thereby accelerating the deposition of ceria oxide on rubbing iron surfaces to reduce wear [21]. This mutual action, which is more efficient than the individual actions, is termed as synergy or a synergistic effect [22]. However, there have been few reports on the combinational effect of nanomaterials with general EP additives on the tribological behavior of lubricating grease.…”

Some Aspects of Grease Flow in Lubrication Systems and Friction Nodes

“…Research results indicate the benefits of the increase of the percentage of the solid additives in the lubricating greases. Of course, there are also works which show the advantages of the synergism of the powdered PTFE as well as tin and copper in the lubricating compounds [21,22].…”