Due to the tendency of high-speed railway transport to become more widely used for passenger traffic, the problem of rail and wheel wear becomes substantially more significant. Huge amounts of greases consumed in rail lubrication necessitate the synthesis of a new generation of greases that combine the high efficiency of improving the wear resistance of a railwheel contact with low cost. The traditional approaches to developing colloidal greases are based on the addition of fine, hard particles, mainly mineral (molybdenum disulfide, graphite, natural serpentinites, other lamellar and lamellar-strip aluminum silicates, etc.) to the base of a grease (the oil phase). However, during the mass production of greases, mechanical dispersion yields particles with sizes of at least 10 µm. Using this method, smaller particles (with sizes of a few microns or less) can only be formed under laboratory conditions, e.g., in cryogenic attritors. Large particles of colloidal greases usually clog filters and are prone to sedimentation, which limits their application. In this work, we studied colloidal greases with hard nanoparticles of aluminum silicates produced by the physicochemical disintegration of modified natural aluminum silicates using available and fairly inexpensive components. The conclusions are: (1) The method of synthesizing the antiwear additive has been developed based on the physicochemical disintegration of bentonite into separate nanoparticles of aluminum silicates and on the uniform distribution of these nanoparticles over the bulk of the grease using the resonance method. (2) The effect of the load on the wear resistance of friction pairs was studied. It has been found that, under heavy loads applied to a friction pair, the efficiency of the grease with the antiwear additive is the most pronounced. In this case, in the context of the wear resistance and efficiency, the optimal amount of the nanoparticles of aluminum silicates introduced into the grease is 0.5 wt % of the total amount of the grease. (3) Experimental samples of highly efficient greases have been produced that ensure an increase in the wear resistance of steel surfaces by two to four times. (4) The proposed greases are especially promising for using in high-speed railway transport, since they form reversible spatial structures, which are stable at high gradients of the shear rate and high shear stresses in a grease film.
Studying colloidal greases with hard nanoparticles of aluminum silicates used to reduce wear of steel friction pairs
Journal of Friction and Wear ; 34 , 6 ; 460-465
2013
6 Seiten, 4 Bilder, 2 Tabellen, 9 Quellen
Article (Journal)
English
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