Abstract
We have developed a method and an apparatus for determining the relative wear resistance of materials under conditions of friction on a loose abrasive. The study suggests an algorithm for calculating geometric parameters of abrasive particles, which makes it possible to present the contours of abrasive particles, used to determine the wear resistance, as functions and to calculate the sharpness parameter of particles SPLm, which is in close correlation with the intensity of wear for abrasives of various shapes. This technique was used to analyze the geometric parameters of selected abrasive particles before and after the tests by the Lorentz force method and after the tests on the developed apparatus. A regression analysis has resulted in an equation that determines a correlation between the wear intensity for steel and the parameters of the abrasive particle’s sharpness SPLm, roundness R, convexity C, and size (Fmax).The suggested method and apparatus for determining the relative wear resistance of materials under conditions of friction on a loose abrasive improve the efficiency of tribotechnical testing by allowing testing of materials for wear by a loose abrasive at a significant specific pressure of the abrasive and at a high degree of exchange in the abrasive mass in the area of interaction between the working surface of the sample and the abrasive, which increases the ability of abrasive silicon carbide particles ~1.4 times compared to the Lorentz force method.
Highlights
Wearing out due to friction against a loose abrasive is a common type of operational deterioration of equipment parts in such industries as oil and gas, mining, construction, and manufacturing as well as in the use of earthmoving, road-building, and agricultural machinery
Taking into account the shortcomings of the existing test methods, we developed a method and an apparatus for determining the relative wear resistance of materials and coatings [13], which allow testing materials for wear by a loose abrasive at a high specific pressure of the abrasive and at a significant exchange of the abrasive mass in the area of interaction between the working surface of the sample and the abrasive
(4) for each detected sharp peak, we found the chord length (CL) received at the intersection of the circle with the radius rm and the particle contour, which was followed by developing the profiles of the peaks of the abrasive particles in coordinates: (CL; ∆R = R(θi ) − rm) and approximating them with a piecewise linear function (Fig. 6) of the following type: а b c d e
Summary
Wearing out due to friction against a loose abrasive is a common type of operational deterioration of equipment parts in such industries as oil and gas, mining, construction, and manufacturing as well as in the use of earthmoving, road-building, and agricultural machinery. The existing approaches are insufficiently effective if they are based on empirical methods of selecting materials only by the parameter of their hardness, as in many cases there is a poor correlation between hardness and wear resistance due to the peculiarities of the microstructure of the surface layer, on the one hand, and specific contact-force action of abrasive particles with different morphological features, on the other. There is a need to develop new methods and devices for tribological studies, which would allow producing an adequate assessment of the relative wear resistance of various kinds of materials and coatings, taking into account the geometric parameters of the abrasive particles. Given that under current conditions the range of surfacing materials is constantly expanding, and the requirements for their physical and mechanical properties remain high, the development of new methods and devices for the assessment of abrasive wear resistance is an important direction in modern tribology
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