Estimation of activation energy of chemical modification of frictional surfaces under boundary lubrication conditions

Algorithm for Tribokinetic Modeling Tests of Triboconjuction Materials for Industrial Products

“…Nowadays three methods for evaluating the activation energy are known: 1) Graphic [9,10,11,12,15]; 2) Extrapolation [16]; 3) Kinetic [7,13,14,17,18]. In the first method the value of Е d depends on the scale of the coordinate system.…”

“…In the first method the value of Е d depends on the scale of the coordinate system. Therefore Е d can only be used in comparative trials [18]. In the second method of meaning Е d depends on the subjective qualities of the researcher since extrapolation is an approximation of the values f(x) in points x lying outside the segment (xo, xn) by their values at points xo<x<…<xn.…”

Performance of lubricants in the rolling friction zone and kinetics of their tribochemical transformations

“…Taking into account the data of [22], we can derive the following dependence: the degree of consumption of lubricant dispersion medium as a function of its apparent activation energy E (10) and the effect of friction parameters (σ is contact stress, d av n is the speed factor) on the degree of consumption of a single-component dispersion medium (11) where E' is a constant which has a meaning of apparent activation energy independent of friction parameters, a 1 The linear Gibbs energy relations and the experimental and theoretical correlations obtained in [22] make it possible to assume that, in the first approximation, the performance of a lubricant material consisting of two noninteracting liquids can be assessed as follows [22]: (12) where x A and x B are the contents of components A and B in the lubricant material (x A + x B = 1); E A and E B are total apparent energies of activation of components. In this case, the effect of friction parameters on the degree of consumption of a two-component dispersion lubricant medium should be described as follows:…”

“…Only in recent years, the chemical aspects of friction and lubrication processes begin to attract attention. The important role of products of tribochemical reactions in providing the lubricating properties, reducing the wear rate, and increasing the service life of friction units has been recognized [9][10][11][12][13][14][15][16][17][18][19][20][21][22]. The effect of the composition of greases on their service life and the degree of tribochemical transformations in the friction zone was studied [23][24][25][26][27].…”