WEAR RESISTANCE OF MULTI-COMPONENT COMPOSITE COATINGS APPLIED BY CONCENTRATING ENERGY FLOWS

In this work are presented the results of comparative tests of the abrasion wear characteristics and the wear resistance of new coatings from multi-component composite materials. The main objective of the study is to reveal the mechanisms of wear and optimization of the composition of multi-component materials to obtain high wear resistant coatings under conditions of abrasion and erosion. The coatings are applied by electrical spark deposition and gas-fuel spraying on carbon steel substrates. Composite mixtures of Cr-Ni-Co-B-Si-C, reinforced with micro-sized particles of boron and tungsten carbides, and titanium diboride in varying proportions are used for layering. Results were obtained for the influence of microgeometric parameters, the composition and microstructure of coatings on their wear resistance and on the characteristics of the wear at different loads under dry abrasive friction. It has been found that the resulting coatings have a 20-50% higher wear resistance than the conventional materials used. The compositions of layering materials and the process parameters of the two methods have been determined, at which maximum wear resistance of the coated samples is obtained.