Influence Evaluation of the RVS Friction Geomodifier on Tribotechnical Parameters of the Contact in Non-Stationary Working Conditions

Abstract

It has been found that empirical analysis provides a possibility to select the optimum concentration of the repair and restoring composition (RVS), addition of which to the transmission oil provides an increase in wear resistance of 42Cr4 steel under rolling and slip conditions. The structural adaptability of finely dispersed components of the friction geo-modifier RVS, boundary lubricating films and surface layers of metal under friction and under dynamic loading conditions contribute to reducing the wear of contact surfaces. It has been established that the addition of 1.5 % RVS to the lubricant provides a 17 % reduction in the wear of rolling friction pairs, provides hardening of the surface layers of the metal by 1.36 times, compared with the initial surface. The micro-hardness of the surface layers of the metal and its gradient depth distribution, the microgeometry of the surface layer formed during friction, and the formation of boundary lubricating layers on the friction-activated contact surfaces are key indicators that increase the wear resistance in friction pairs.

A Methodological Approach to Assessing the Tribological Properties of Lubricants Using a Four-Ball Tribometer

“…Such a methodological approach allows for differentiation in the effectiveness of anti-wear and extreme pressure additives. The sum of these properties results in an integral parameter reflecting the tribological properties of the lubricant [29,30].…”

“…The presented methodology and parameters for the assessment of the effectiveness of anti-wear and extreme pressure additives include the mandatory determination of the wear index and its inclusion in the general formula. In our opinion, this methodological approach reduces the information content of the test results obtained from a four-ball tribometer [24,29,30]. Excluding the wear indicator from the general formula for the estimation of the integral parameter can significantly enhance the method's information content.…”