The article is devoted to the technology of cold gas-dynamic spraying - a relatively new technology for creating functional coatings in which narrowed-expanding nozzles (De Laval nozzles) are used, in which solid powders are sprayed at or close to supersonic speed in the direction of the substrate, where they plastically deform and adhere. Cold gas dynamic spraying is an innovative process that has received widespread scientific interest and industrial applications in the automotive, aerospace and biotechnology industries in recent years. Spraying various powder materials in this way provides protection against corrosion and can increase the mechanical strength and wear resistance of details. With that method it is possible to create functional coatings with different thermal conductivities and electrical conductivities, which can be used as insulation materials, conducting and isolation surface layers of parts, coatings for controlling gaps, restoring and repairing details. The article discusses modern developments in the field of experimental analysis of technologies and processes of cold gas-dynamic spraying, the systems of cold gas-dynamic spraying and coating formation are determined and the parameters and principles of the process are described. The installation for spraying surfaces developed at VNAU is presented and researches and the analysis of possibility of use of a method of a cold gas-dynamic spraying for restoration of details of autotractor equipment of agricultural purpose are carried out.

The article presents the results of the analysis of antifriction materials based on tin and lead, copper, aluminum, plastics. The advantages and disadvantages of one or another antifriction material, as well as the possibility of their application on the surface of parts by the method of cold gas-dynamic spraying, are shown. The use of liquid and solid anti-friction materials as lubricating oils is considered. Considerable attention has been paid to materials with the same crystal structure as graphite, now known as two-dimensional (2D) materials. Among these 2D materials, the most studied materials are MoS2 and a carbon-based compound, including graphite and graphene. The scheme of interaction of sliding surfaces is considered, including wear, molecular deformation, adhesion, thermal effect and the environment. Analysis of anti-friction materials showed that their application to the surface of parts can be carried out using the process of cold gas-dynamic spraying. The article shows a diagram and type of installation for cold gas-dynamic spraying of antifriction surface layers. For the research, copper-graphite powder with a particle size of 10,7 – 80,8 microns was used. Using the application "Maso central characteristics" of the software "Compass-3D", the mass of the deposited figure as a continuous material for copper-graphite coatings, with a density of ρ1 = 0,0086454 g / mm3, and the porosity of the deposited figure were determined. In the course of the study, it was found that, in comparison with the substrate material AA7075, the sliding friction coefficient was reduced by 47% - 62% for the copper-graphite surface layer. To obtain composite coatings, a mechanical mixture of A30-01 aluminum powder and C01-00 copper was used. The dependences of the coefficients of sputtering of copper and aluminum on the mass content of aluminum in the sprayed mixture at an initial concentration of aluminum of less than 66% are found. The copper deposition rate is higher than the aluminum deposition rate. Both monotonically increase with increasing aluminum concentration until it reaches 61%. At high concentrations of aluminum (more than 66%), the coefficients of deposition of copper, aluminum and their mixtures coincide.

One of the transitions to the path of intensification of the production processes is the perceptibly low stability of the details of the nodes in the possession of these production processes. The stamina of the details is small, vindictive, nasampered, rubbing in pairs, especially quiet, which works out of significant tensions in aggressive middles. The wear of the upper balls of parts can ruin the possession, which leads to the waste of energy and material resources. One of the ways to solve the problem is the creation of functional coatings on the surfaces that are resistant to aggressive environments. The results of the analysis of antifriction properties of materials containing copper, tin, lead, aluminum, and polymers are presented. The advantages and disadvantages of antifriction properties of the materials in question are shown and the possibility of their application on the surface of parts using cold gas dynamic spraying. The use of liquid and solid antifriction materials as lubricants is analyzed. Attention is paid to materials with a crystalline structure similar to the structure of graphite, known as 2D structures (two-dimensional materials)." The most studied 2D materials are MoS2 and carbon-based compounds, including graphene and graphite. The diagram of the interaction of sliding surfaces, including molecular deformation, wear, bonding, the thermal effect, and environmental influence is shown. It is noted that the application of antifriction materials to the surface of parts can be carried out using cold gas-dynamic spraying. Found that compared to the material of the substrate AA7075, the coefficient of friction of sliding of the spray coating with the crystal of copper-graphite powder was reduced by 47% - 62%. Rubber composite coatings are made of a mechanical mixture of aluminum powder A30-01 and copper C01-00. The dependence of the coefficients of spraying aluminum and copper on the content of aluminum in the composite mixture that is sprayed is obtained. until it reaches 61%. At higher concentrations of aluminum (more than 66%) the coefficients of spraying aluminum, copper, and their mixtures coincide.