Tribological Properties of Polytetrafluoroethylene, Nano-Titanium Dioxide, and Nano-Silicon Dioxide as Additives in Mixed Oil-Based Titanium Complex Grease

Abstract

Eight titanium complex greases (i.e., benzoic acid/stearic acid and sebacic acid/stearic acid titanium complex greases, and greases containing PTFE, or nanotitanium dioxide, or nano-silicon dioxide) were synthesized using 3-L reaction vessel. Their physical characteristics were characterized and their tribological properties were evaluated by using a four-ball tester. Chemical compositions of the boundary films generated on worn surfaces were analyzed with the use of scanning electron microscope and X-ray photoelectron spectrometer. Results show titanium complex greases containing PTFE, or nano-titanium dioxide, or nano-silicon dioxide exhibited excellent tribological performance. The mechanism for the frictionreduction and antiwear effect of all titanium complex greases was also proposed and discussed from a tribochemistry point of view.

Improvement in tribological properties of lubricating grease with quartz-enriched rice husk ash

“…In this regard, researchers are actively involved in the search for lubricants which could prove to be very effective in the reduction of tribological wear in a wide range of industrial applications. For instance, different types of inorganic powders, such as molybdenum disulfide [1,2], titanium dioxide [3], ferric oxide [4], silicon dioxide [5][6][7][8], calcium carbonate [9,10], zinc oxide [11], lanthanum hydroxide [12], graphene [13], etc. were used as solid additives for improvement in tribological properties of different types of lubricants.…”

“…The idea of this work stemmed from the findings of the researchers [5][6][7][8], who used SiO 2 particles as the solid additive in lubricants for improving their antiwear performance. Since RH is a silica rich material [14][15][16][17][18]; therefore, it is anticipated that it might prove to be effective and cheap additive for the formulation of grease of improved tribological properties.…”

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

“…The maximum non-seizure load (1100 N) of sample #11 is equal to the results in [12] when nano-titanium dioxide and nano-silicon dioxide were used as additives. Therefore, by addition of 3.0 wt% CeO 2 nanoparticles and 2.0 wt% SIB, Ti-complex grease exhibited excellent the combination of extreme pressure and anti-wear properties, although the P D , WSD and μ performance are not the optimal values.…”

“…Chen et al [10][11][12] also reported that the benzoic acid-based titanium grease exhibited preferable anti-wear properties and pleasurable load-carrying capacity. It was believed that the improvements were due to titanic chemical films forming on and protecting the rubbing surface of the steel ball.…”

Effects of Nanoparticle Enhanced Lubricant Films in Dynamic Properties of Plain Journal Bearings at High Reynolds Numbers

“…Greases incorporating nanoparticle [2] or nanotubes [3] such as nano-crystalline silicone dioxide display and nanocrystalline titanium dioxide noteworthy decrease the wear and friction [4]. Potassium Tetraborate and Nano boric acid have also been used fruitfully as resistance tumbling additives in oil and greases [5].…”