Yu. P. Kozyrev

Predicting the behavior of polymer composites on the basis of a physical model of wear

The derivation of a physical model of wear from the empirical formula for wear is considered, with the goal of predicting the wear resistance of polymer composites. Formulas for the wear rate are proposed; these formulas take account of the content of disperse filler and the contact pressure.

The effect of the structural features of polytetrafluoroethylene-based composites on the reduction of matrix loading

It has been shown analytically that a decrease in the matrix loading due to a finely dispersed filler in a material that has a distribution like a segregated network is one of the reasons for an increase in the tribological properties of polytetrafluoroethylene-based composites. The relationship between the matrix loading of the composite and the concentration and size of the filler particles is revealed. An example of how to calculate the matrix loading of a polytetrafluoroethylene-based composite with a diamond powder filler with a mean particle size of 50 nm is given.

Thermal distribution in the PTFE–steel frictional pair

Research on the wear of a PTFE–18Kh2N4MA steel pair indicates that the heat-distribution coefficient calculated from the Sharron formula for the polymer is too low. The transfer of polymer to the steel must be taken into account in determining that coefficient.

Wear mechanisms of polytetrafluoroethylene during its friction against various grades of steel

Wear tests of polytetrafluoroethylene paired with two grades of steel have been performed. It has been shown that the presence of alloying additives in steels has a positive effect on widening of the operating load range for polytetrafluoroethylene. The analytical dependence of the wear factor on the contact pressure multiplied by the sliding velocity has been obtained for the adhesive wear mechanism. The friction surfaces of polytetrafluoroethylene in cases of the adhesive and fatigue mechanisms of wear have been comparatively studied.

Influence of C60 fullerene on fretting wear of metals

The potential usefulness of C60 as additives in lubricating oils and as coatings under fretting conditions is demonstrated by tribological techniques.

Increase in the wear resistance of polytetrafluoroethylene on filling with disperse particles

The reduction in the wear of polytetrafluoroethylene (PTFE) in the presence of disperse filler is analyzed. It is found that decrease in the load on the PTFE matrix increases the mechanical component in the wear of PTFE composites. The calculations are confirmed by experiments on the wear of F4K15M5 composite.

Antifrictional nanocomposites based on polymers with a multilayer disperse filler

Structural aspects of composites with disperse nanofiller are considered. The model developed permits assessment of the wear resistance of nanocomposites as a function of the filler concentration and particle size. The calculation results correspond satisfactorily to experimental curves.

Influence of Fibrous and Disperse Fillers on the Frictional Load in the Polymer Matrix

The influence of filler on the wear resistance of polymer composites is investigated. Three types of filler are considered: reinforcing fibers; short fibers; and disperse particles. Formulas for the proportion of the load on the polymer matrix permit optimization of the filler content in the composites, in the light of the frictional conditions.

Transfer films in a PTFE–steel pair at different temperatures

The wear of the polytetrafluoroethylene–steel frictional pair is investigated. The dependence of the frictional coefficient and the wear on the contact temperature is determined. The temperature range of adhesive wear is established for polytetrafluoroethylene.

Effect of material state on the wear of filled polytetrafluoroethylene composite F4K20 on its basis

Tests for the wear of polytetrafluoroethylene and composites on its basis with different glass transition and softening temperatures has been performed. It has been demonstrated that a rise in temperature leads to an abrupt rise in wear due to the build up of adhesive on the metallic counterbody. The method of temperature calculations in the frictional contact zone has been developed and tested. It has been demonstrated that the introduction of filler into polytetrafluoroethylene results in a rise in the glass transition temperature from–120°C, which corresponds to polytetrafluoroethylene, to +150°C.