FEATURES OF TWO-COMPONENT COATINGS FORMATION
The paper presents the results of study on structure and properties of two-component coating deposited by "cold" gas dynamic spraying of aluminum and zinc particles mixture on an aluminum substrate. The dependence of the hardness of the two-component coatings with technological parameters of deposition was studied. It shows an increase in hardness to ≈1050 MPa in case of the minimum temperature of spraying and a hardness decline to ≈750 MPa in case of temperature of 540 °C. An increase of zinc content in coatings from 38,7±2,5 to 61,6±3 w. % and a decrease of aluminum content from 41,8±0,8 to 18,5±0,7 w. % with temperature growth were observed by x-ray study due to different densities of metals and different particles speeds. Results of mathematical modeling of temperature variation with depth are presented. Diffusion depth was also estimated. Areas with high zinc content (up to 73.9 w. %) were observed and the areas might be formed during metals mixturing by corundum particles.