The possibility of modifying the elements of the bearing assembly with nanoparticles in order to reduce the friction coefficient

3rd International Conference on Innovative Materials, Structures and Technologies

Stankevich, P.^1 ; Mironovs, V.^1 ; Vasilyeva, E.^2 ; Breki, A.^2 ; Tolochko, O.^2

Laboratory of Powder Materials, Riga Technical University, Kipsalas 6B, Riga

LV-1048, Latvia^1

Material Science Faculty, Peter the Great State Polytechnic University, Polytechnicheskaya Street, Saint-Petersburg

195251, Russia^2

关键词: Bearing assemblies;    Connecting nodes;    Friction coefficients;    Friction conditions;    Industrial mineral;    Low-alloyed powders;    Tribological characteristics;    Tungsten disulphide;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/251/1/012084/pdf
DOI  :  10.1088/1757-899X/251/1/012084

来源: IOP

【 摘 要 】

Recent study considers the tribological characteristics of the sintered bushings used in the connecting nodes brake lever system of railway cars. Particular attention is paid sleeves low content of alloying elements. Bushings had been prepared by powder metallurgy route by using low alloyed powders of Fe-Cu-C system. Porosity after sintering was about 20%. Generally, before using material was impregnated by industrial mineral oil in order to improve friction condition. In the recent study we use new lubricating compositions for impregnating in sintered bodies. Such compositions consist of basic mineral oil with addition of 4 wt.% of layered tungsten dichalcogenides (WS2 and WSe2) nanoparticles, which were ultrasonically dispersed. Tungsten disulphide nanoparticles have spherical shape with the diameter of 30-50 nm, and diselenide nanoparticles have a flat shape with the mean dimensions of 5x70 nm. Tribological testing of the product was provided. Sintered bushings impregnated with commercial oil and suspension of nanoparticles were tested in the spinning friction conditions in the couple with bearing steel at the load of 210 N and spinning rate of 200 rpm. The friction test in couple with steel exhibited the value of friction moment to be about 2 times less as compared with commercial oil. The additions of tungsten disulphide nanoparticles also significantly decrease oscillations the friction torque.