Tribological Characteristics of Combined Layered Phosphate and Silicate Additives in Mineral Oil

Abstract

A mixture containing a-Zr(HPO 4 ) 2 ÁH 2 O, a small particle layered-phosphate, and a-Na 2 Si 2 O 5 , a microparticle-layered silicate, is investigated for its potential as an additive in mineral oil. A four-ball tester is employed to measure the maximum non-seizure load, wear scar diameter, and friction coefficient of the combined additives. Friction and wear tests indicate that synergistic behavior exists between the two base materials; the load capacity, anti-wear, and friction reducing ability of the base oil are markedly increased when the combined materials are added. More important is the combined materials exhibit considerable advantage over typical lubricant additives, such as MoS 2 and graphite, presenting good application prospects as lubricant additives. The X-ray diffraction, scanning electron microscopy, and energydispersive X-ray spectroscopy results illustrate that the synergistic behavior of the combined material stems from the small a-ZrP particles confined in the valleys of the contacting surfaces that polish the wear surface, as well as the layered a-Na 2 Si 2 O 5 microparticles that effectively fill voids in the wear surface.

Nano Serpentine Powders as Lubricant Additive: Tribological Behaviors and Self-Repairing Performance on Worn Surface

“…With outstanding anti-friction property, wear-resistance performance, insensitivity to temperature, and self-repairing function, micro/nano-scaled additives, such as graphene [8], MoS 2 [9], ZrS 2 [10], silicate [11], and two-dimensional (2D) Ti 3 C 2 T x nanosheets [12,13] have been highly focused recently. Among various additives, ultrafine natural powders have attracted much attention due to their low cost, facile preparation procedure and good tribological performance.…”

Electro-active control of the viscous flow and tribological performance of ecolubricants based on phyllosilicate clay minerals and castor oil

“…In general, the tribology of lubricating fluids containing different types of clay minerals has been the subject matter of a list of published works. Thus, attempts on the use of these materials in the development of "greener" lubricants can be found involving: montmorillonite clay (Chizhik et al, 2019;Gorbacheva et al, 2020;Peña-Paras et al, 2018; halloysite nanotubes (Peña-Paras et al, 2017); sepiolite nanofibers (Martin-Alfonso et al, 2020); attapulgite nanofibers (Wang et al, 2011;Yu et al, 2021), combined layered-phosphate and layered-silicate (Chen et al, 2011); SiO2 nanoparticles (Taha-Tijerina et al, 2019), among others. However, to the best of our knowledge, there is no evidence of a previous approach of this type in the field of lubrication under electric potentials.…”