Creating Surface Layers of Parts With Increased Tribological Characteristics Using Cold Gas-Dynamic Spraying

Abstract

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.