620.193

tillage machines, durability, composite electrolytic coatings.

The results of researches of influence of composite electrolytic coverings (CEP) on abrasive wear resistance of working bodies of tillage machines: paws of cultivators, disk harrows, plowshares are resulted in work. The influence of SiC (silicon carbide) filler particle sizes and their volume content in the nickel matrix on the tribological characteristics of QES applied to steel samples 45 was studied. QES with inclusions of silicon carbide fractions 28/20 and 50/40 microns, which have the least wear at all loads. The content of filler in such coatings is, respectively, 24 and 28 vol.%. Compared with galvanic nickel, such coatings have a reduction in wear of 13 and 5 times at loads of 20, 40, 60 N, respectively. Analysis of the test results showed that with increasing load, such as the coefficient of friction decreases and with increasing SiC particle size for the range of particle sizes of the filler 40… 60 μm, the coefficient of friction is minimal. For coatings with large filler particles (fraction 100/80) the coefficient of friction is higher. Thus, tribological studies show the prospects and effectiveness of CEP to increase the wear resistance of the working bodies of tillage machines.