The effect of the thickener on the efficiency of load-carrying additives in greases

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

“…This capability opens up the doors of formulating nano-greases efficiently with least possibility of agglomeration and sedimentation of nano-particles (NPs). 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. crystalline as graphite [12,13], 2D structure as graphene [19] or multilayer graphene (MLT) [20] and tubular form as carbon nanotubes (CNTs) [21] etc. has shown significant potential to influence the AF, AW and Extreme Pressure (EP) properties of lubricating greases ( Table 1).…”

“…[27] have reported the effect of graphite of various sizes with dispersant in oil. The research efforts on the exploration of MPs and NPs of graphite in greases [12,13,19,22,24] showed that no studies could be available on the size and performance correlation effect for all the tribo-performance properties such as AF, AW and EP. Keeping this in view, four sizes of graphite particles (50 nm, 450 nm, 4 μm and 10 μm) in a fixed amount (4 wt.%) were selected to develop greases to examine the effect as AFA, AWA and EPA and the investigations along with analysis are stated in the following sections.…”

A study on tribological behaviours of ZDDP in polymer thickened lubricating greases

“…Following is the reasoning and explanations proposed by H.B. Silver et al A study of clay and graphite thickened greases and additives seems most justified in this case also . Authors discussed that a polar thickener interacts with polar additive molecules and acts as a carrier for additive to bring it to the metal surface.…”

“…Atsushi et al studied affect on friction, wear and rheology of lithium soap grease with different soap fibre lengths prepared in ester base oil and found that the grease with longer soap fibres had a lower coefficient of friction than the grease with shorter soap fibres. More work on the influence of thickener and thickener structure on grease performance can be found in references . Physico‐chemical properties and microstructural network of polymeric greases are different from the conventional lithium lubricating greases and other soap based thickeners .…”