Efficacy of serpentine-type anti-friction additives in performance improvement of friction pairs
2018
Belinskaia, I., Saint-Petersburg State Agrarian Univ. (Russian Federation) | Evseev, A., Saint-Petersburg State Agrarian Univ. (Russian Federation)
An effective way to increase serviceability of the crankshaft engine is the use in lubricating antifriction additives. This allows to significantly extend the service life of the engine and to reduce the financial cost of its maintenance. One of the varieties of anti-friction additives – friction geomodifiers – is the additive “Energy and resources saving” (ERS). The main objective of the use of anti-friction additives ERS – optimization of clearances in the pair carried out by building a protective layer. Raw materials for the manufacture of ERS are one of the varieties of silicates – layered silicates – serpentine. It is formed under the influence of hydrothermal solutions on ultramafic olivine rocks. Base of such rocks is silica oxide radical in the form of a tetrahedron. The accumulated theoretical and practical experimental base suggests that using lubricants with the addition of serpentine-type friction geomodifiers significantly increases the serviceability of pairing, wear resistance of mating parts is increased 2–4 times. At the same time the loss of energy to overcome friction is reduced 1.5 times, while the roughness of metal friction surfaces – several times. The aim of the study is to determine the influence of ERS additive concentration in motor oil on the serviceability of the engine’s crankshaft bearing in moments of operation, when the effect of hydrodynamic lubrication is reduced. The conducted experiments show that the concentration of anti-friction ERS additive in modified oils significantly influences the process of friction of the surfaces. Positive effect of oil modification occurs at concentrations of more than 0.5 %. Increasing the concentration of additive above 2 % leads to deterioration in the service life of friction pairs. The minimum value of the coefficient of friction and roughness parameters of the friction surfaces for the friction pair “Steel 40X – Alloy ASM” correspond to concentrations of 1.8 to 1.9 %.
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